Hi Nick,
I have no experience with iSCSI. My experience with multipathing is
with fibre attached disk arrays. What I have successfully done with
those (on RHEL4) was to unmount and export the vg, then implement
multipath, then import the vg and everything just worked.
Frank
On 10/13/08 5:39 AM, Nick Lunt wrote:
Hi Folks,
I've got a server running RH5.2 will several volume groups mounted via
iSCSI from an MD3000i.
Unfortunately these volume groups were not created with multipathing
in mind, so pv's were created using the /dev/sdx devices.
I want to enable multipathing on this server but I'm not sure if I can
do it with the current setup of if I need to recreate the pv's.
Using multipathing before the VGs are created I would pvcreate
/dev/mapper/mpathn where mpathn points to the disk devices ie
/dev/mapper/mpath1 -> sdb sdc sdd sde
/dev/mapper/mpath2 -> sdf sdg sdh sdi
etc
So if if LVM is currently using /dev/sdx for pv's is it OK to setup
multipathing without recreating the pv's from /dev/mapper/mpathn (and
losing data) ?
If anyone has any thoughts on this I'd appreciate there input.
Kind Regards
Nick Lunt
Managed Services and O/S Analyst
Patech Solutions Limited
Tel: 01543 444 707
Fax: 01543 444 709
Tame House, Fradley Park, Lichfield, Staffordshire, WS13 8RZ
www.patech-solutions.com <http://www.patech-solutions.com/home.htm>
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Frank Swasey | http://www.uvm.edu/~fcs
Sr Systems Administrator | Always remember: You are UNIQUE,
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