On 06/14/2011 01:38 PM, Jelle de Jong wrote: > migration test by doing crm node standby on active target > # crm configure show > http://paste.debian.net/119832/ > I already had to tune the ocf:heartbeat:iSCSILogicalUnit timeout to 80s.
That's entirely possible, if your KVM hosts are producing a big I/O backlog (but see my comment about cache="none" below). > # repeating error message during migration until migration completes > ERROR: Called "tgtadm --lld iscsi --op delete --mode logicalunit --tid 1 > --lun=1" > ERROR: Exit code 22 > ERROR: Command output: "tgtadm: this logical unit is still active" If that message repeats a few time and then still succeeds, that's OK. I need to downgrade that message to a warning, though. > # disk erros during iscsi/drbd migration on kvm host system > http://paste.debian.net/119830/ You need to either use portblock (check the guide I mentioned in my 2/24 message), or move the IP address to the end of the resource group. > # lvm logical volume is damaged after this... > > # the kvm guest system was running bonnie++ -d /tmp/bonnie/ -n 128 > # and the guest reported disk errors and bonnie crashed > # dmesg: > http://paste.debian.net/119831/ > > Other kvm guest running mysql got corrupted databases. > > However no more read-only file-systems on all kvm guests and the file > system damage was recoverable instead of complete destruction after > running fsck in previous tests... Sure all your KVM block devices are using cache="none"? You may also want to take a look at this guide: http://www.linbit.com/en/education/tech-guides/highly-available-virtualization-with-kvm-iscsi-pacemaker/ > Please advice :) A migraion of the iscsi/drbd target should be possible > on a busy system without damage to the guests? Yes, and we know it's possible. That's what we demonstrated here: http://linuxconfau.blip.tv/file/4719948/ Florian
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