Re: FYI: Notes on setting up KVM guests using iSCSI
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Daniel,Thank you. I was misunderstanding how iscsi iSCSI Enterprise Target Daemon /ietd.conf work. I was setting up multiple targets with only one LUN each, and thinking I was creating multiple LUNs on the same target.
So right way to set up multiple LUNS for one target under Ubuntu Karmic using iSCSI Enterprise Target via ietd.conf:
Target iqn.2010-04.gov.blah.blah.blah.keeper:vmstorage <SNIP> # Logical Unit definition # You must define one logical unit at least. # Block devices, regular files, LVM, and RAID can be offered # to the initiators as a block device. Lun 0 Path=/dev/vg0/iscsi_pool,Type=fileio Lun 1 Path=/dev/vg0/test_pool,Type=fileio # Alias name for this target Alias VMStoragePool <SNIP> <NOT> Target iqn.2010-04.gov.blah.blah.blah.keeper:vmstorage.lun0 Lun 0 Path=/dev/vg0/iscsi_pool,Type=fileio ALIAS LUN0 Target iqn.2010-04.gov.blah.blah.blah.keeper:vmstorage.lun1 Lun 1 Path=/dev/vg0/test_pool,Type=fileio ALIAS LUN1 </NOT>To add additional volumes, additional LUNs will need to be created on the TARGET side, and then exported via iSCSI
After correcting my Target side configuration, I was able to create an iSCSI pool through virt-manager, and see the two LUNs as available volumes.
On Wed, 5 May 2010, Daniel P. Berrange wrote:
On Wed, May 05, 2010 at 08:50:57AM -0500, David Ehle wrote:Daniel, OK so I think I get it now. While for other storage backends one pool can hold multiple volumes, when using iSCIS there is alwasy a 1 to 1 relationship for pool to volume? Each pool contains exactly one volume?No, each pool can contain multiple volumes. If you have created a iSCSI target and given it multiple LUNs, then you'll see multiple volumes in libvirt. See the virsh vol-list output in this example:http://berrange.com/posts/2010/05/05/provisioning-kvm-virtual-machines-on-iscsi-the-hard-way-part-2-of-2/for an iSCSI target with 2 LUNs Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
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