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Trouble assembling multipath md devices between two nodes who see the same LUNs.

DISCUSSION Anu Matthew 2 participants 2 messages Apr 19, 2005 MD RAID

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Anu Matthew

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Thanks Larks. It is much appreciated.

If the original metadata written by hostA changes by "mdadm --assemble" running on hostB, will mdmpd be able to recover the failed links on hostA when they re-surface? I am asking this because, I guess unless hostA goes down, hostA reflects the new metadata written by hostB. Will mdmpd take the new uuid into account?

Not entirely OT, but devabel gets to the see the same uuid/serial numbers on the shared luns across hosts. It would have been cool if mdadm could too, right?

Thanks,

Anu Matthew

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Quoted 13 lines

On 2005-04-18T17:14:53, Anu Matthew

md multipath has on-disk metadata and modifies it. md is NOT cluster-safe for concurrent activation.

Sincerely,
Lars Marowsky-Brée <[email protected]>

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High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business

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#1 lore raw
Quoted 3 lines · Anu Matthew

Thanks Larks. It is much appreciated.

If the original metadata written by hostA changes by "mdadm --assemble" running on hostB, will mdmpd be able to recover the failed links on hostA when they re-surface? I am asking this because, I guess unless hostA goes down, hostA reflects the new metadata written by hostB. Will mdmpd take the new uuid into account?

DONT ACTIVATE THE ARRAY ON MORE THAN _1_ HOST AT THE SAME TIME. whatever you do in the failover setup make it so that the md is activated only on the active node.

Quoted 1 line

Not entirely OT, but devabel gets to the see the same uuid/serial numbers on the shared luns across hosts. It would have been cool if mdadm could too, right?

mdadm can use the UUID stored in the raid superblock, thus avoiding the need to using devlabel (last time i looked at devlabel it was so buggy, it could not make head or tails of a non partitioned disk)

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Luca Berra -- [email protected]
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