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[libvirt-users] Unsafe migration with copy-storage-all (non shared storage) and writeback cache
by Gionatan Danti 21 Feb '17

21 Feb '17

Hi list, I would like to understand if, and why, the --unsafe flag is needed when using --copy-storage-all when migrating guests which uses writeback cache mode. Background: I want to live migrate guests with writeback cache from host A to host B and these hosts only have local storage (ie: no shared storage at all). From my understanding, --unsafe should be only required when migrating writeback-enabled guests between two hosts which share non-cluster-aware storage (ie: NFS), but it should not be necessary when not sharing storage. However, when trying to migrate from a CentOS6 host to a CentOS7 machine with command [root@source ~]# virsh migrate Totem --live --copy-storage-all --persistent --verbose qemu+ssh://root@172.31.255.11/system I have the following error: error: Unsafe migration: Migration may lead to data corruption if disks use cache != none So, my questions are: 1) it is safe to do a live migration with --copy-storage-all when guests are using writeback cache mode? 2) if so, why libvirt complains about that? 3) if not, what is the best method to migrate a running quest using writeback cache mode? Thanks. -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti(a)assyoma.it - info(a)assyoma.it GPG public key ID: FF5F32A8

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[libvirt-users] "virsh list" ahngs
by Yunchih Chen 21 Feb '17

21 Feb '17

`virsh list` hangs on my server that hosts a bunch of VMs. This might be due to the Debian upgrade I did on Feb 15, which upgrades `libvirt` from 2.4.0-1 to 3.0.0-2. I have tried restarting libvirtd for a few times, without luck. Attached below are some relevant logs; let me know if you need some more for debugging. Thanks for your help!! root@vm-host:~# uname -a Linux vm-host 4.6.0-1-amd64 #1 SMP Debian 4.6.4-1 (2016-07-18) x86_64 GNU/Linux root@vm-host:~# apt-cache policy libvirt-daemon libvirt-daemon: Installed: 3.0.0-2 Candidate: 3.0.0-2 Version table: *** 3.0.0-2 500 500 http://debian.csie.ntu.edu.tw/debian testing/main amd64 Packages 100 /var/lib/dpkg/status root@vm-host:~# strace -o /tmp/trace -e trace=network,file,poll virsh list # hangs forever ..... ^C root@vm-host:~# tail -10 /tmp/trace access("/etc/libvirt/libvirt.conf", F_OK) = 0 open("/etc/libvirt/libvirt.conf", O_RDONLY) = 5 access("/proc/vz", F_OK) = -1 ENOENT (No such file or directory) socket(AF_UNIX, SOCK_STREAM, 0) = 5 connect(5, {sa_family=AF_UNIX, sun_path="/var/run/libvirt/libvirt-sock"}, 110) = 0 getsockname(5, {sa_family=AF_UNIX}, [128->2]) = 0 poll([{fd=5, events=POLLOUT}, {fd=6, events=POLLIN}], 2, -1) = 1 ([{fd=5, revents=POLLOUT}]) poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1) = ? ERESTART_RESTARTBLOCK (Interrupted by signal) --- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} --- +++ killed by SIGINT +++ root@vm-host:~# lsof /var/run/libvirt/libvirt-sock # hangs too ... ^C root@vm-host:~# LIBVIRT_DEBUG=1 virsh list 2017-02-17 15:58:36.126+0000: 18505: info : libvirt version: 3.0.0, package: 2 (Guido Günther <agx(a)sigxcpu.org> Wed, 25 Jan 2017 07:04:08 +0100) 2017-02-17 15:58:36.126+0000: 18505: info : hostname: vm-host 2017-02-17 15:58:36.126+0000: 18505: debug : virGlobalInit:386 : register drivers 2017-02-17 15:58:36.127+0000: 18505: debug : virRegisterConnectDriver:684 : driver=0x7f1e5aca2c40 name=Test 2017-02-17 15:58:36.127+0000: 18505: debug : virRegisterConnectDriver:695 : registering Test as driver 0 2017-02-17 15:58:36.127+0000: 18505: debug : virRegisterConnectDriver:684 : driver=0x7f1e5aca4ac0 name=OPENVZ 2017-02-17 15:58:36.127+0000: 18505: debug : virRegisterConnectDriver:695 : registering OPENVZ as driver 1 2017-02-17 15:58:36.127+0000: 18505: debug : virRegisterConnectDriver:684 : driver=0x7f1e5aca5260 name=VMWARE 2017-02-17 15:58:36.127+0000: 18505: debug : virRegisterConnectDriver:695 : registering VMWARE as driver 2 2017-02-17 15:58:36.127+0000: 18505: debug : virRegisterConnectDriver:684 : driver=0x7f1e5aca3720 name=remote 2017-02-17 15:58:36.127+0000: 18505: debug : virRegisterConnectDriver:695 : registering remote as driver 3 2017-02-17 15:58:36.127+0000: 18505: debug : virEventRegisterDefaultImpl:267 : registering default event implementation 2017-02-17 15:58:36.127+0000: 18505: debug : virEventPollAddHandle:115 : Used 0 handle slots, adding at least 10 more 2017-02-17 15:58:36.127+0000: 18505: debug : virEventPollInterruptLocked:722 : Skip interrupt, 0 0 2017-02-17 15:58:36.127+0000: 18505: info : virEventPollAddHandle:140 : EVENT_POLL_ADD_HANDLE: watch=1 fd=3 events=1 cb=0x7f1e5a7fc140 opaque=(nil) ff=(nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virEventRegisterImpl:234 : addHandle=0x7f1e5a7fc860 updateHandle=0x7f1e5a7fcb90 removeHandle=0x7f1e5a7fc1a0 addTimeout=0x7f1e5a7fc310 updateTimeout=0x7f1e5a7fc510 removeTimeout=0x7f1e5a7fc6e0 2017-02-17 15:58:36.127+0000: 18505: debug : virEventPollAddTimeout:230 : Used 0 timeout slots, adding at least 10 more 2017-02-17 15:58:36.127+0000: 18505: debug : virEventPollInterruptLocked:722 : Skip interrupt, 0 0 2017-02-17 15:58:36.127+0000: 18505: info : virEventPollAddTimeout:253 : EVENT_POLL_ADD_TIMEOUT: timer=1 frequency=-1 cb=0x563a29758360 opaque=0x7fff70941380 ff=(nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenAuth:1245 : name=<null>, auth=0x7f1e5aca2a00, flags=0 2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : OBJECT_NEW: obj=0x563a2a7f5f50 classname=virConnect 2017-02-17 15:58:36.127+0000: 18505: debug : virConfLoadConfig:1604 : Loading config file '/etc/libvirt/libvirt.conf' 2017-02-17 15:58:36.127+0000: 18505: debug : virConfReadFile:778 : filename=/etc/libvirt/libvirt.conf 2017-02-17 15:58:36.127+0000: 18506: debug : virThreadJobSet:99 : Thread 18506 is now running job vshEventLoop 2017-02-17 15:58:36.127+0000: 18506: debug : virEventRunDefaultImpl:311 : running default event implementation 2017-02-17 15:58:36.127+0000: 18505: debug : virFileClose:108 : Closed fd 5 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupTimeouts:525 : Cleanup 1 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupHandles:574 : Cleanup 1 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 : Prepare n=0 w=1, f=3 e=1 d=0 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCalculateTimeout:371 : No timeout is pending 2017-02-17 15:58:36.127+0000: 18506: info : virEventPollRunOnce:640 : EVENT_POLL_RUN: nhandles=1 timeout=-1 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add entry (null) (nil) 2017-02-17 15:58:36.127+0000: 18505: debug : virConfGetValueString:932 : Get value string (nil) 0 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1040 : no name, allowing driver auto-select 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1083 : trying driver 0 (Test) ... 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1098 : driver 0 Test returned DECLINED 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1083 : trying driver 1 (OPENVZ) ... 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1098 : driver 1 OPENVZ returned DECLINED 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1083 : trying driver 2 (VMWARE) ... 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1098 : driver 2 VMWARE returned DECLINED 2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1083 : trying driver 3 (remote) ... 2017-02-17 15:58:36.127+0000: 18505: debug : remoteConnectOpen:1343 : Auto-probe remote URI 2017-02-17 15:58:36.127+0000: 18505: debug : doRemoteOpen:907 : proceeding with name = 2017-02-17 15:58:36.127+0000: 18505: debug : doRemoteOpen:916 : Connecting with transport 1 2017-02-17 15:58:36.127+0000: 18505: debug : doRemoteOpen:1051 : Proceeding with sockname /var/run/libvirt/libvirt-sock 2017-02-17 15:58:36.127+0000: 18505: debug : virNetSocketNewConnectUNIX:639 : path=/var/run/libvirt/libvirt-sock spawnDaemon=0 binary=<null> 2017-02-17 15:58:36.127+0000: 18505: debug : virNetSocketNewConnectUNIX:703 : connect() succeeded 2017-02-17 15:58:36.127+0000: 18505: debug : virNetSocketNew:235 : localAddr=0x7fff70940d00 remoteAddr=0x7fff70940d90 fd=5 errfd=-1 pid=0 2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : OBJECT_NEW: obj=0x563a2a7f7980 classname=virNetSocket 2017-02-17 15:58:36.127+0000: 18505: info : virNetSocketNew:291 : RPC_SOCKET_NEW: sock=0x563a2a7f7980 fd=5 errfd=-1 pid=0 localAddr=127.0.0.1;0, remoteAddr=127.0.0.1;0 2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : OBJECT_NEW: obj=0x563a2a7f7d80 classname=virNetClient 2017-02-17 15:58:36.127+0000: 18505: info : virNetClientNew:328 : RPC_CLIENT_NEW: client=0x563a2a7f7d80 sock=0x563a2a7f7980 2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : OBJECT_REF: obj=0x563a2a7f7d80 2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : OBJECT_REF: obj=0x563a2a7f7980 2017-02-17 15:58:36.127+0000: 18505: debug : virEventPollInterruptLocked:726 : Interrupting 2017-02-17 15:58:36.127+0000: 18505: info : virEventPollAddHandle:140 : EVENT_POLL_ADD_HANDLE: watch=2 fd=5 events=1 cb=0x7f1e5a96cd10 opaque=0x563a2a7f7980 ff=0x7f1e5a96ccc0 2017-02-17 15:58:36.127+0000: 18505: debug : virKeepAliveNew:199 : client=0x563a2a7f7d80, interval=-1, count=0 2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : OBJECT_NEW: obj=0x563a2a7f8080 classname=virKeepAlive 2017-02-17 15:58:36.127+0000: 18505: info : virKeepAliveNew:218 : RPC_KEEPALIVE_NEW: ka=0x563a2a7f8080 client=0x563a2a7f7d80 2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : OBJECT_REF: obj=0x563a2a7f7d80 2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : OBJECT_NEW: obj=0x563a2a7f6740 classname=virConnectCloseCallbackData 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollRunOnce:650 : Poll got 1 event(s) 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollDispatchTimeouts:432 : Dispatch 1 2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : OBJECT_REF: obj=0x563a2a7f6740 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollDispatchHandles:478 : Dispatch 1 2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : OBJECT_NEW: obj=0x563a2a7f7fa0 classname=virNetClientProgram 2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : OBJECT_NEW: obj=0x563a2a7f7b60 classname=virNetClientProgram 2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : OBJECT_NEW: obj=0x563a2a7f7910 classname=virNetClientProgram 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollDispatchHandles:492 : i=0 w=1 2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : OBJECT_REF: obj=0x563a2a7f7fa0 2017-02-17 15:58:36.127+0000: 18506: info : virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=1 events=1 2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : OBJECT_REF: obj=0x563a2a7f7b60 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupTimeouts:525 : Cleanup 1 2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : OBJECT_REF: obj=0x563a2a7f7910 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupHandles:574 : Cleanup 2 2017-02-17 15:58:36.127+0000: 18505: debug : doRemoteOpen:1170 : Trying authentication 2017-02-17 15:58:36.127+0000: 18506: debug : virEventRunDefaultImpl:311 : running default event implementation 2017-02-17 15:58:36.127+0000: 18505: debug : virNetMessageNew:46 : msg=0x563a2a7fa470 tracked=0 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupTimeouts:525 : Cleanup 1 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupHandles:574 : Cleanup 2 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 : Prepare n=0 w=1, f=3 e=1 d=0 2017-02-17 15:58:36.127+0000: 18505: debug : virNetMessageEncodePayload:386 : Encode length as 28 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 : Prepare n=1 w=2, f=5 e=1 d=0 2017-02-17 15:58:36.127+0000: 18505: info : virNetClientSendInternal:2104 : RPC_CLIENT_MSG_TX_QUEUE: client=0x563a2a7f7d80 len=28 prog=536903814 vers=1 proc=66 type=0 status=0 serial=0 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers 2017-02-17 15:58:36.127+0000: 18505: debug : virNetClientCallNew:2057 : New call 0x563a2a7f7340: msg=0x563a2a7fa470, expectReply=1, nonBlock=0 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCalculateTimeout:371 : No timeout is pending 2017-02-17 15:58:36.127+0000: 18505: debug : virNetClientIO:1866 : Outgoing message prog=536903814 version=1 serial=0 proc=66 type=0 length=28 dispatch=(nil) 2017-02-17 15:58:36.127+0000: 18506: info : virEventPollRunOnce:640 : EVENT_POLL_RUN: nhandles=2 timeout=-1 2017-02-17 15:58:36.127+0000: 18505: debug : virNetClientIO:1925 : We have the buck head=0x563a2a7f7340 call=0x563a2a7f7340 2017-02-17 15:58:36.127+0000: 18505: info : virEventPollUpdateHandle:152 : EVENT_POLL_UPDATE_HANDLE: watch=2 events=0 2017-02-17 15:58:36.127+0000: 18505: debug : virEventPollInterruptLocked:726 : Interrupting 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollRunOnce:650 : Poll got 1 event(s) 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollDispatchTimeouts:432 : Dispatch 1 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollDispatchHandles:478 : Dispatch 2 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollDispatchHandles:492 : i=0 w=1 2017-02-17 15:58:36.127+0000: 18506: info : virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=1 events=1 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupTimeouts:525 : Cleanup 1 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupHandles:574 : Cleanup 2 2017-02-17 15:58:36.127+0000: 18506: debug : virEventRunDefaultImpl:311 : running default event implementation 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupTimeouts:525 : Cleanup 1 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollCleanupHandles:574 : Cleanup 2 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 : Prepare n=0 w=1, f=3 e=1 d=0 2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 : Prepare n=1 w=2, f=5 e=0 d=0 2017-02-17 15:58:36.128+0000: 18506: debug : virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers 2017-02-17 15:58:36.128+0000: 18506: debug : virEventPollCalculateTimeout:371 : No timeout is pending 2017-02-17 15:58:36.128+0000: 18506: info : virEventPollRunOnce:640 : EVENT_POLL_RUN: nhandles=1 timeout=-1 ^C -- -- Yun-Chih Chen 陳耘志 Network/Workstation Assistant Dept. of Computer Science and Information Engineering National Taiwan University Tel: +886-2-33664888 ext. 217/204 Email: ta217(a)csie.ntu.edu.tw Website: http://wslab.csie.ntu.edu.tw/

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[libvirt-users] Libvirt behavior when mixing io=native and cache=writeback
by Gionatan Danti 20 Feb '17

20 Feb '17

Hi all, I write about libvirt inconsistent behavior when mixing io=native and cache=writeback. This post can be regarded as an extension, or clarification request, of BZ 1086704 (https://bugzilla.redhat.com/show_bug.cgi?id=1086704) On a fully upgraded CentOS6 x86-64 machine, starting a guest with io=native and cache=writeback is permitted: no errors are raised and the VM (qemu, really) silently use "io=threads" instead. A warning should be raised, but I find reasonable that the VM is permitted to run. On a fully upgraded CentOS7 x86-64 machine, starting a guest with io=native and cache=writeback is *not* permitted: an error is raised and the guest is not started. While it is absolutely OK to alert the user about the configuration error, I feel the VM should be started as on CentOS6. Anyway, this is not a big problem when dealing with a single host. A more concerning behavior is that when trying to migrate a guest from the very first CentOS6 machine, which starts and runs such a guest with io=native and cache=writeback without problems, to a CentOS7 host, live migration aborts with an error: [root@source] virsh migrate Totem --live --copy-storage-all --persistent --verbose --unsafe qemu+ssh://root@172.31.255.11/system error: unsupported configuration: native I/O needs either no disk cache or directsync cache mode, QEMU will fallback to aio=threads This error persists even if the VM config file is changed to use "io=threads". Of course, the running image continue to have "io=native" on its parameters list, but it does not really honor the "io=native" directive, so I find strange that live migration can not proceed. I think it is very reasonable to raise an error, but such error should not block the live migration process. In short: there is some method to live migrate a running VM configured with "io=native" (but which is really using "io=threads" internally) and "cache=writeback"? Thanks. -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti(a)assyoma.it - info(a)assyoma.it GPG public key ID: FF5F32A8

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[libvirt-users] Why Guest does not retain Host CPU flags
by akhilesh rawat 17 Feb '17

17 Feb '17

hi , I am creating Guest by Libvirt tool " virt-install" with cpu model as host. After Guest creation i see Guest Missing quite no of flags which Host was having . What could be the reason for this ? I am expecting all flags of Host to e present in Guest as well when choosing cpu model as host . Guest : processor : 19 vendor_id : GenuineIntel cpu family : 6 model : 42 model name : Intel Xeon E312xx (Sandy Bridge) stepping : 1 microcode : 0x1 cpu MHz : 1995.266 cache size : 4096 KB fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl eagerfpu pni pclmulqdq vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx hypervisor lahf_lm xsaveopt tpr_shadow vnmi flexpriority ept vpid bogomips : 4013.27 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management: HOst : processor : 23 vendor_id : GenuineIntel cpu family : 6 model : 45 model name : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz stepping : 7 microcode : 0x710 cpu MHz : 1400.000 cache size : 15360 KB physical id : 1 siblings : 12 core id : 5 cpu cores : 6 apicid : 43 initial apicid : 43 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid xsaveopt bogomips : 4004.01 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management: br aki

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[libvirt-users] vm running slowly in powerful host
by Lentes, Bernd 17 Feb '17

17 Feb '17

Hi, i have a vm which has a poor performance. E.g. top needs seconds to refresh its output on the console. Same with netstat. The guest is hosting a MySQL DB with a webfrontend, its response is poor too. I'm looking for the culprit. Following top in the guest i get these hints: Memory is free enough, system is not swapping. System has 8GB RAM and two cpu's. Cpu 0 is struggling with a lot of software interrupts, between 50% and 80%. Cpu1 is often waiting for IO (wa), between 0% and 20%. No application is consuming much cpu time. Here is an example: top - 11:19:18 up 18:19, 11 users, load average: 1.44, 0.94, 0.66 Tasks: 95 total, 1 running, 94 sleeping, 0 stopped, 0 zombie Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 20.0%id, 0.0%wa, 0.0%hi, 80.0%si, 0.0%st Cpu1 : 1.9%us, 13.8%sy, 0.0%ni, 73.8%id, 10.5%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 7995216k total, 6385176k used, 1610040k free, 177772k buffers Swap: 2104472k total, 0k used, 2104472k free, 5940884k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6470 root 16 0 12844 1464 804 S 12 0.0 2:17.13 screen 6022 root 15 0 41032 3052 2340 S 3 0.0 1:10.99 sshd 8322 root 0 -20 10460 4976 2268 S 3 0.1 19:20.38 atop 10806 root 16 0 5540 1216 880 R 0 0.0 0:00.51 top 126 root 15 0 0 0 0 S 0 0.0 0:23.33 pdflush 3531 postgres 15 0 68616 1600 792 S 0 0.0 0:41.24 postmaster The host in which the guest runs has 96GB RAM and 8 cores. It does not seem to do much: top - 11:21:19 up 15 days, 15:53, 14 users, load average: 1.40, 1.39, 1.40 Tasks: 221 total, 2 running, 219 sleeping, 0 stopped, 0 zombie Cpu0 : 15.9%us, 2.7%sy, 0.0%ni, 81.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 5.0%us, 3.0%sy, 0.0%ni, 92.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu2 : 2.0%us, 0.3%sy, 0.0%ni, 97.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu3 : 0.3%us, 1.0%sy, 0.0%ni, 98.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu4 : 1.3%us, 0.3%sy, 0.0%ni, 98.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu5 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu6 : 0.3%us, 0.0%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu7 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 96738M total, 13466M used, 83272M free, 3M buffers Swap: 2046M total, 0M used, 2046M free, 3887M cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 21765 root 20 0 105m 15m 4244 S 5 0.0 0:00.15 crm 3180 root 20 0 8572m 8.0g 8392 S 3 8.4 62:25.73 qemu-kvm 8529 hacluste 10 -10 90820 14m 9400 S 0 0.0 29:52.48 cib 21329 root 20 0 9040 1364 940 R 0 0.0 0:00.16 top 28439 root 20 0 0 0 0 S 0 0.0 0:04.51 kworker/4:2 1 root 20 0 10560 828 692 S 0 0.0 0:07.67 init 2 root 20 0 0 0 0 S 0 0.0 0:00.28 kthreadd 3 root 20 0 0 0 0 S 0 0.0 3:03.23 ksoftirqd/0 6 root RT 0 0 0 0 S 0 0.0 0:05.02 migration/0 7 root RT 0 0 0 0 S 0 0.0 0:02.82 watchdog/0 8 root RT 0 0 0 0 S 0 0.0 0:05.18 migration/1 I think the host is not the problem. The vm resides on a SAN which is attached via FC. The whole system is a two node cluster. The vm resides in a raw partition without a FS, which i read should be good for the performance. It runs on the other node slow too. Inside the vm i have logical volumes (it was a physical system i migrated to a vm). The partitions are formatted with reiserfs (The system is already some years old, at that time reiserfs was popular ...). I use iostat on the guest: This is a typical snapshot: Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util vda 0.00 3.05 0.00 2.05 0.00 20.40 19.90 0.09 44.59 31.22 6.40 dm-0 0.00 0.00 0.00 4.55 0.00 18.20 8.00 0.24 52.31 7.74 3.52 dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-2 0.00 0.00 0.00 0.10 0.00 0.40 8.00 0.01 92.00 56.00 0.56 dm-3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-5 0.00 0.00 0.00 0.35 0.00 1.40 8.00 0.03 90.29 65.71 2.30 dm-6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 vda has several partitions, one for /, one for swap, and two physical volumes for LVM. Following "man iostat", the columns await and svctm seem to be important. Man says: await The average time (in milliseconds) for I/O requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them. svctm The average service time (in milliseconds) for I/O requests that were issued to the device. It seems system is waiting a long time for IO. Although the amount of transfered data is small. I have some suspicions: - the lvm setup in the guest - some hardware - cache mode for the disk is "none". Otherwise i can't do a live migration. What do you think ? How can i find out from where the high si comes ? Network and disk are virtio devices (which should be fast): vm58820-4:~ # lsmod|grep -i virt virtio_balloon 22788 0 virtio_net 30464 0 virtio_pci 27264 0 virtio_ring 21376 1 virtio_pci virtio_blk 25224 5 virtio 22916 4 virtio_balloon,virtio_net,virtio_pci,virtio_blk That's the config of the guest: <domain type='kvm'> <name>mausdb_vm</name> <uuid>f08c2f32-fe35-137a-0e9d-fa7485d57974</uuid> <memory unit='KiB'>8198144</memory> <currentMemory unit='KiB'>8197376</currentMemory> <vcpu placement='static'>2</vcpu> <os> <type arch='x86_64' machine='pc-i440fx-1.4'>hvm</type> <boot dev='cdrom'/> <bootmenu enable='yes'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source dev='/dev/vg_cluster_01/lv_cluster_01'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> <controller type='usb' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'/> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:37:92:01'/> <source bridge='br0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </memballoon> </devices> <seclabel type='none'/> </domain> Host OS is SLES 11 SP4, guest os is SLES 10 SP4. Both 64bit. Thanks for any hint. Bernd -- Bernd Lentes Systemadministration institute of developmental genetics Gebäude 35.34 - Raum 208 HelmholtzZentrum München bernd.lentes(a)helmholtz-muenchen.de phone: +49 (0)89 3187 1241 fax: +49 (0)89 3187 2294 Erst wenn man sich auf etwas festlegt kann man Unrecht haben Scott Adams Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrer: Prof. Dr. Guenther Wess, Heinrich Bassler, Dr. Alfons Enhsen Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671

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[libvirt-users] provisioning with vagrant-libvirt leaves .img file only readable by root
by Hans-Christoph Steiner 15 Feb '17

15 Feb '17

I'm using libvirt on Debian/stretch (testing) with vagrant and the vagrant-libvirt plugin. When I import a vagrant box (jessie64.box), the resulting file permssions let anyone in the "kvm" group read the img. But when I build upon that box, only root can read it: -rw------- 1 root root 20198785024 Sep 19 18:19 buildserver_default.img -rwxr--r-- 1 libvirt-qemu kvm 2148663296 Sep 5 22:55 jessie64_vagrant_box_image_0.img How can I control those file permissions as a regular user in the libvirtd group? I need to read that image in order to use qemu-img to rebase and create a new vagrant box. The current `vagrant package` command only works with VirtualBox VMs, but its easy to make a .box if you have read access to the libvirt QEMU .img file. /etc/libvirt/storage/default.xml says: <target> <path>/var/lib/libvirt/images</path> <permissions> <mode>0755</mode> </permissions> </target> You can find the context for this work here: https://gitlab.com/fdroid/fdroidserver/issues/238 .hc -- PGP fingerprint: EE66 20C7 136B 0D2C 456C 0A4D E9E2 8DEA 00AA 5556 https://pgp.mit.edu/pks/lookup?op=vindex&search=0xE9E28DEA00AA5556

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[libvirt-users] high memory guest issues - virsh start and QEMU_JOB_WAIT_TIME
by Blair Bethwaite 15 Feb '17

15 Feb '17

Hi all, In IRC last night Dan helpfully confirmed my analysis of an issue we are seeing attempting to launch high memory KVM guests backed by hugepages... In this case the guests have 240GB of memory allocated from two host NUMA nodes to two guest NUMA nodes. The trouble is that allocating the hugepage backed qemu process seems to take longer than the 30s QEMU_JOB_WAIT_TIME and so libvirt then most unhelpfully kills the barely spawned guest. Dan said there was currently no workaround available so I'm now looking at building a custom libvirt which sets QEMU_JOB_WAIT_TIME=60s. I have two related questions: 1) will this change have any untoward side-effects? 2) if not, then is there any reason not to change it in master until a better solution comes along (or possibly better, alter qemuDomainObjBeginJobInternal to give a domain start job a little longer compared to other jobs)? -- Cheers, ~Blairo

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[libvirt-users] Error in libvirt-GUI
by abhishek jain 15 Feb '17

15 Feb '17

Hi, I am using libvirt --> 0.10.2 and virt-manager --> 0.9.0 version (RHEL 6). Very rare I get following error message dialogue box. (Image is attached for the error dialogue box ) Error saysError polling connection:'qemu+ssh......' Internal error client socket is closed TraceBack (most recent calls)engine.py: 440 conn.tickconnection.py: 1433 self.hostinfo() = self.vmm.getinfo() Is it a problem with libvirt or with my environment Thanks in advance. RegardsAbhishek

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[libvirt-users] Hyper-V support in Windows client
by masaeedu＠gmail.com 13 Feb '17

13 Feb '17

Hi there, I’m trying to connect to Hyper-V on Windows using libvirt. It seems neither the libvirt binaries bundled with Virt Viewer, nor the libvirt binary in the mingw64-libvirt Rawhide RPM have support for Hyper-V. Is it likely that just downloading the source RPM and trying to build –with-hyperv would just work? Thanks, Asad

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[libvirt-users] How to achieve higher priority of a process in a lxc on CentOS machine
by WANG Cheng D 09 Feb '17

09 Feb '17

Dear all, I use libvirt lxc to host a real-time application with priority of -50. The native OS is fedora21 and lxc is also fedora21. Everything works fine. Linux "top" command shows the priority is -50). Then I use Openstack to manage lxc. The native compute node OS is CentOS7.2. and the lxc is fedora. After the real-time application is started in the lxc. top command on the native machine sees the real-time application with priority of 20, which is not what I expect. If lxc is Ubuntu, the priority of real-time application is also 20. Can anybody help me on this? Cheng Wang

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