[linux-lvm] steps to clone a volume group

Michael Jensen beachhangar at yahoo.com
Tue Nov 18 00:06:50 UTC 2008

Option 1 we are doing now but trying to avoid due to software license fees, etc.

not a vet yet with linux syntax --

trying item 2c and subbing host0 for hostN  -- getting --
bash: echo: write error: invalid argument

i'm sure its something very obvious, but not too me...



From: Rich Graves <rgraves at carleton.edu>
To: linux-lvm at redhat.com
Sent: Monday, November 17, 2008 3:27:43 PM
Subject: Re: [linux-lvm] steps to clone a volume group

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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