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Set up a multi path SAS link between c3000 enclosure and MSA array on RHEL6

Hi Experts,

We are trying to set a storage link between an HP c3000 blade system (2 servers, 2 3Gb SAS switches) and an MSA array (2 controllers).

We also have 4 SAS links :

- MSA controller 1 port 1 to 3Gb SAS 1 port 1
- MSA controller 1 port 2 to 3Gb SAS 2 port 1
- MSA controller 2 port 1 to 3Gb SAS 1 port 2
- MSA controller 2 port 2 to 3Gb SAS 2 port 2

Servers are running RHEL 6 and domino messaging.
Array is splitted into 2 logical volumes : one per server (no shared storage)

We are experiencing troubles testing storage links redundancy.
RHEL experiences I/O errors as soon as some links are missing.

What is the proper way to set a fully redundant storage path (multipath) with RHEL6 ?

Any help will be appreciated (migration impared)

Best regards,
Anthony

Member_2_231077

According to the following doc HP's multipath mapper is replaced by the OS generic one so you'll have to sign up to HP SPOCK and go through The Native Linux Device Mapper Multipath reference guide to see how to to configure.

I'm a bit worried when you say "some links are missing", one link missing is covered by redundancy, two missing is considered a double fault so is not covered. Taking both paths off a controller does not cause failover.

farzanj

There is HP device mapper and there is Red Hat based system. Which one was used to map?

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