[libvirt] Reg : failing to attach iscsi disk from virsh to running VM on xen

Hi , For attaching iSCSI disk I have tried like this *iscsi target side :* * 1 created an iqn number* #tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2009-06.com.eucalyptus.cluster1:store1 * 2. added one lun to it* #tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /fs.iscsi.disk * 3.To enable the target to accept any initiators, enter:* #tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL * 4.To view the current configuration, enter:* #tgtadm --lld iscsi --op show --mode target *iscsi initaitor side (where libvirt and xen is running)* * 1. to** scan for the newly created target* * #*iscsiadm -m discovery -t sendtargets -p 192.168.53.14 * 2. created pool file * <pool type="iscsi"> <name>sample3</name> <source> <host name="192.168.53.14"/> <device path="iqn.2009-06.com.eucalyptus.cluster1:store1"/> </source> <target> <path>/dev/disk/by-path</path> </target> </pool> * 3.*#virsh pool-define sample_pool.xml #virsh pool-start sample3 then it created one link like this at */dev/disk/by-path/* *ip-192.168.53.14:3260-iscsi-iqn.2009-06.com.eucalyptus.cluster1:store1-lun-1 -> ../../sdb* 4. I have attached using virsh attach-disk #virsh attach-disk 1 /dev/sdb xvdb It is attached successfully , I console in vm I have checked . But while using with eucalyptus,It is not attching. I'm using eucalyptus 3.4.2 , libvirt 1.2.3 with xen4.3.1 to attach volume to vm . eucalyptus attaching volume is done through iscsi disk , intermediate files are created while attaching volume in xml format as below. *File 1:* <?xml version="1.0" encoding="UTF-8"?> <disk type="block"> <driver cache="none" name="phy"/> <source dev="/dev/disk/by-id/scsi-1IET_00230001"/> <target dev="sdf" bus="scsi"/> <serial>vol-759A3CDB-dev-sdf</serial> </disk> *File 2:* <?xml version="1.0" encoding="UTF-8"?> <volume> <hypervisor type="xen" capability="xen+hw" bitness="64"/> <id>vol-759A3CDB</id> <user>AIDOMCCNSP7YNR7IEZEUX</user> <instancePath>/usr/local/eucalyptus/work/AIDOMCCNSP7YNR7IEZEUX/i-ED153F84</instancePath> <os platform="linux" virtioRoot="false" virtioDisk="false" virtioNetwork="false"/> <backing> <root type="image"/> </backing> <diskPath targetDeviceType="disk" targetDeviceName="sdf" targetDeviceBus="scsi" sourceType="block" serial="vol-759A3CDB-dev-sdf">/dev/disk/by-id/scsi-1IET_00230001</diskPath> </volume> *in libvirtd.log i'm getting* *error : libxlDomainAttachDeviceDiskLive:2567 : unsupported configuration: disk bus 'scsi' cannot be hotplugged.* Can u suggest how to enable or patch to scsi hotplug from libvirt which support for xen. Can u say the meaning of PATCH 11/12 what is 11/12 means. eg ; [libvirt] [PATCH 11/12] Properly support SCSI drive hotplug With Regards Prapulla Kumar R