[linux-lvm] steps to clone a volume group

Rich Graves rgraves at carleton.edu
Mon Nov 17 23:27:43 UTC 2008

I've had that problem too. Two workarounds. Here's what I usually do:

 1a) Map the snapshot LUN to a *different* host than the production machine.
 1b) Change the UUID and VG/LV there.
 1c) *Then* map the LUN to the production machine.

Alternatively (untested):

 2a) service haldaemon stop; service multipathd stop; service lvm2-monitor stop (not sure which of these is really necessary)
 2b) Map the snapshot to the production server in the SAN.
 2c) Manually add with echo '- - -' > /sys/class/scsi_host/hostN/scan
 2d) Change UUID and VG/LV.
 2e) Manually remove with echo 1 > /sys/block/sdX/device/delete
 2f) service haldaemon start; service multipathd start; service lvm2-monitor start
Rich Graves http://claimid.com/rcgraves
Carleton.edu Sr UNIX and Security Admin
CMC135: 507-222-7079 Cell: 952-292-6529

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