11:46 a.m.
We're looking at a problem when we have a libvirt pool defined, below
[root@xnl2192 ~]# virsh pool-dumpxml ScsiPool-host2
<pool type='scsi'>
<name>ScsiPool-host2</name>
<uuid>f2ea1882-881f-9f49-838d-39e070f68002</uuid>
<capacity>136583315456</capacity>
<allocation>136583315456</allocation>
<available>0</available>
<source>
<adapter name='host2'/>
</source>
<target>
<path>/dev/disk/by-id</path>
<permissions>
<mode>0700</mode>
<owner>-1</owner>
<group>-1</group>
</permissions>
</target>
</pool>
As you can see, this pool maps to /dev/disk/by-id. There may be a large
number of actual volume entries in /dev/disk/by-id, however it appears
only a distinct subset of them are actually added into the libvirt pool
when you do a pool-refresh. What does libvirt check when determining
which, and whether or not, to add one of these volume into the vol-list?
In particular, we have a case when one specific volume in /dev/disk/by-id
is *not* added into the pool, and no amount of pool-refresh makes a
difference. We did notice that if you remove all the sym links in
/dev/disk/by-id and do a pool-refresh, that libvirt re-scans the bus,
recreates the links in /dev/disk/by-id, and adds (some of) the volumes
back into the vol-list. But not this one problematic vol, so clearly there
is something about this vol that libvirt doesnt like and why it is
(deliberately?) not added to the pool.
What checks, etc does libvirt make against vols when determining whether
to add them to a pool?
- G
Dr. Gareth S. Bestor
IBM Senior Software Engineer
Systems & Technology Group - Systems Management Standards
971-285-6375 (mobile)
bestor(a)us.ibm.com
12:05 a.m.
Perhaps we should put this on libvirt-list(a)redhat.com?
On 08/17/2011 12:46 PM, Gareth S Bestor wrote:
We're looking at a problem when we have a libvirt pool defined, below
[root@xnl2192 ~]# virsh pool-dumpxml ScsiPool-host2
<pool type='scsi'>
<name>ScsiPool-host2</name>
<uuid>f2ea1882-881f-9f49-838d-39e070f68002</uuid>
<capacity>136583315456</capacity>
<allocation>136583315456</allocation>
<available>0</available>
<source>
<adapter name='host2'/>
</source>
<target>
<path>/dev/disk/by-id</path>
<permissions>
<mode>0700</mode>
<owner>-1</owner>
<group>-1</group>
</permissions>
</target>
</pool>
As you can see, this pool maps to /dev/disk/by-id. There may be a large
number of actual volume entries in /dev/disk/by-id, however it appears
only a distinct subset of them are actually added into the libvirt pool
when you do a pool-refresh. What does libvirt check when determining
which, and whether or not, to add one of these volume into the vol-list?
In particular, we have a case when one specific volume in
/dev/disk/by-id is *not* added into the pool, and no amount of
pool-refresh makes a difference. We did notice that if you remove all
the sym links in /dev/disk/by-id and do a pool-refresh, that libvirt
re-scans the bus, recreates the links in /dev/disk/by-id, and adds (some
of) the volumes back into the vol-list. But not this one problematic
vol, so clearly there is something about this vol that libvirt doesnt
like and why it is (deliberately?) not added to the pool.
What checks, etc does libvirt make against vols when determining whether
to add them to a pool?
- G
Dr. Gareth S. Bestor
IBM Senior Software Engineer
Systems & Technology Group - Systems Management Standards
971-285-6375 (mobile)
bestor(a)us.ibm.com
_______________________________________________
Libvirt-cim mailing list
Libvirt-cim(a)redhat.com
https://www.redhat.com/mailman/listinfo/libvirt-cim
--
Chip Vincent
Open Virtualization
IBM Linux Technology Center
cvincent(a)linux.vnet.ibm.com
12:25 a.m.
libvirt-users is a better list, and I noticed that Gareth already posted on
it and got some replies.
Sharad Mishra
Open Virtualization
Linux Technology Center
IBM
Chip Vincent
<cvincent(a)linux.v
net.ibm.com> To
Sent by: libvirt-cim(a)redhat.com
libvirt-cim-bounc cc
es(a)redhat.com
Subject
Re: [Libvirt-cim] which vols added
08/17/11 10:05 PM to storage pool during refresh?
Please respond to
cvincent(a)linux.vn
et.ibm.com;
Please respond to
List for
discussion and
development of
libvirt CIM
<libvirt-cim@redh
at.com>
Perhaps we should put this on libvirt-list(a)redhat.com?
On 08/17/2011 12:46 PM, Gareth S Bestor wrote:
We're looking at a problem when we have a libvirt pool defined, below
[root@xnl2192 ~]# virsh pool-dumpxml ScsiPool-host2
<pool type='scsi'>
<name>ScsiPool-host2</name>
<uuid>f2ea1882-881f-9f49-838d-39e070f68002</uuid>
<capacity>136583315456</capacity>
<allocation>136583315456</allocation>
<available>0</available>
<source>
<adapter name='host2'/>
</source>
<target>
<path>/dev/disk/by-id</path>
<permissions>
<mode>0700</mode>
<owner>-1</owner>
<group>-1</group>
</permissions>
</target>
</pool>
As you can see, this pool maps to /dev/disk/by-id. There may be a large
number of actual volume entries in /dev/disk/by-id, however it appears
only a distinct subset of them are actually added into the libvirt pool
when you do a pool-refresh. What does libvirt check when determining
which, and whether or not, to add one of these volume into the vol-list?
In particular, we have a case when one specific volume in
/dev/disk/by-id is *not* added into the pool, and no amount of
pool-refresh makes a difference. We did notice that if you remove all
the sym links in /dev/disk/by-id and do a pool-refresh, that libvirt
re-scans the bus, recreates the links in /dev/disk/by-id, and adds (some
of) the volumes back into the vol-list. But not this one problematic
vol, so clearly there is something about this vol that libvirt doesnt
like and why it is (deliberately?) not added to the pool.
What checks, etc does libvirt make against vols when determining whether
to add them to a pool?
- G
Dr. Gareth S. Bestor
IBM Senior Software Engineer
Systems & Technology Group - Systems Management Standards
971-285-6375 (mobile)
bestor(a)us.ibm.com
_______________________________________________
Libvirt-cim mailing list
Libvirt-cim(a)redhat.com
https://www.redhat.com/mailman/listinfo/libvirt-cim
--
Chip Vincent
Open Virtualization
IBM Linux Technology Center
cvincent(a)linux.vnet.ibm.com
_______________________________________________
Libvirt-cim mailing list
Libvirt-cim(a)redhat.com
https://www.redhat.com/mailman/listinfo/libvirt-cim
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2 comments
3 participants
participants (3)
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Chip Vincent -
Gareth S Bestor -
Sharad Mishra