LVM in Dual Path SAN Environment
A Question to the LVM Guy(s):
We would like to use Linux LVM to overcome the fact, Linux doesn't currently support Dual-Path access to SAN (Fibre-Channel) units.
Rumors are, LVM is able to detect multiple paths to a PV (in my case a SAN SCSI LUN) and will rearrange it to one single PV.
As far as i see, this should solve the problem during regular operation (i.e. both paths to the SAN active). But what about the really interesting case of failure on one link? If this is the currently 'active' link (that one, still in t LVM's PV list), we need a failover and rearrangement of the PV list on the fly.
Does this work ??
Many thanks in advance
Regards, Andreas
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Dr. Andreas G. Schindler c/o Alpha Zero One Computersysteme GmbH [email protected] Frankfurter Str. 141, D-63303 Dreieich Tel +49 6103 57187 21 Germany
Quoted 7 lines · Andreas G. Schindler
A Question to the LVM Guy(s):
We would like to use Linux LVM to overcome the fact, Linux doesn't currently support Dual-Path access to SAN (Fibre-Channel) units.
Rumors are, LVM is able to detect multiple paths to a PV (in my case a SAN SCSI LUN) and will rearrange it to one single PV.
Correct.
Quoted 8 lines
As far as i see, this should solve the problem during regular operation (i.e. both paths to the SAN active). But what about the really interesting case of failure on one link? If this is the currently 'active' link (that one, still in t LVM's PV list), we need a failover and rearrangement of the PV list on the fly.
Does this work ??
Not so far. We want to have multipathing with failover support in LVM2 this year.
Quoted 16 lines
Many thanks in advance
Regards, Andreas
Signature · 9 lines
Dr. Andreas G. Schindler c/o Alpha Zero One Computersysteme GmbH [email protected] Frankfurter Str. 141, D-63303 Dreieich Tel +49 6103 57187 21 Germany _______________________________________________ linux-lvm mailing list [email protected] http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
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Regards,
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
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Heinz Mauelshagen Sistina Software Inc.
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[email protected] +49 2626 141200
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-Quoted 4 lines · Andreas G. Schindler
A Question to the LVM Guy(s):
We would like to use Linux LVM to overcome the fact, Linux doesn't currently support Dual-Path access to SAN (Fibre-Channel) units.
If you use md this should work just fine. There has been a number of patches lately that hasn't been included in the main kernel yet, so you may want to patch a little.
Signature · 1 line
Ragnar Kjørstad