(resent, it didn't seem to come through last time) Hi, I'm trying to migrate our servers from an old EVA to a shiney new netapp san if possible without downtime. For most of the volumes I can present in luns from the new san and use pvmove to juggle the data around but several servers have the root volume on the EVA and pvmove has a nasty habit of deadlocking the machine when used on root volumes. I've been working on the technique mentioned on http://sources.redhat.com/lvm2/wiki/FrequentlyAskedQuestions but after a bit of thought it seems it might be better to do the following: 0) add /dev/new_lun to the volume group 1) lvconvert -m 1 /dev/myvg/lvol00 /dev/new_lun 2) wait for the mirror to sync now we have RAID1 mirror copy of lvol00 on /dev/old_lun and /dev/new_lun so: 3) lvconvert -m 0 /dev/myvg/lvol00 /dev/old_lun Breaks the RAID in favour of new_lun and gets rid of the old leaving us with a basic (non-mirrored) linear lvol entire on the new_lun. 4) Rinse and repeat for all the other lvols on old_lun (which you can get from "dmsetup table") 5) vgreduce myvg /dev/old_lun Its less elegant then pvmove but my initial testing seems to suggest it does actually work and doesn't cause deadlocks. However given that pvmove also works by mirroring I'm not convinced I haven't just been lucky so far . So does anyone have any ideas or even better experiance on whether this is likely to work or am I setting myself up for a world of pain if I try it on a live server? All opinions and advice gratefully received :) chris _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
