HP-UX 11.31 Multipathing w/EMC Clarion

[Duncan Edmonstone]

>> How did you configure two of the four paths for "standby"?

- I didn't - they were detected as that by dint of being on an ALUA disk array - if all 4 of yours are showing as "active" that suggests to me you may not have the host mode set correctly on the Clariion - I would expect some of them to show as "standby" (although I'm not completely sure as I don't have a Clariion to compaer with).

Have you confirmed you are using host mode 4 as outlined in some of the previous posts?

HTH

Duncan

[Duncan Edmonstone]

... sorry, not "host mode", but "failover mode"...

HTH

Duncan

[kevin_m]

Below is the lun_map output from a CX500 EMC disk using failover mode 4. We trespassed the LUN as a test and it failed over to the standby path temporarily then returned to the active path afterwards.


LUN PATH INFORMATION FOR LUN : /dev/rdisk/disk120

Total number of LUN paths = 4
World Wide Identifier(WWID) = 0x60060160f8c310006c73f45a4fc4dc11

LUN path : lunpath60
Class = lunpath
Instance = 60
Hardware path = 0/3/1/0.0x5006016930212882.0x400b000000000000
SCSI transport protocol = fibre_channel
State = ACTIVE
Last Open or Close state = ACTIVE

LUN path : lunpath170
Class = lunpath
Instance = 170
Hardware path = 0/3/1/0.0x5006016030212882.0x400b000000000000
SCSI transport protocol = fibre_channel
State = STANDBY
Last Open or Close state = STANDBY

LUN path : lunpath66
Class = lunpath
Instance = 66
Hardware path = 0/6/1/0.0x5006016830212882.0x400b000000000000
SCSI transport protocol = fibre_channel
State = ACTIVE
Last Open or Close state = ACTIVE

LUN path : lunpath182
Class = lunpath
Instance = 182
Hardware path = 0/6/1/0.0x5006016130212882.0x400b000000000000
SCSI transport protocol = fibre_channel
State = STANDBY
Last Open or Close state = STANDBY

- Kevin

[Scott Giddens]

failover mode 4? Sorry, I didn't understand the host mode reference and skipped over that, mostly because I am reading the "EMC Host Connectivity Guide for HP-UX" and there is no mention of failover mode 4.

So I assume it should be set to "HP Auto Trespass" and failover mode 4 at the same time?

[kevin_m]

I attached the ALUA doc again which explains how to change the host initiator failover mode. When using mode 4 the auto-trespass setting will be ignored.

[Duncan Edmonstone]

Scott - I guess you have an out of date copy of the host connectivity guide, as the lines I posted were from the same guide and talk about failover mode 4. My copy is REV A16 dated July 2008.

HTH

Duncan

[Scott Giddens]

Thank you!

my storage group gave me an old copy. I was able to download the ALUA white paper you last posted, prior to that my browser crashed when I selected to open it.

My storage group also sent me an image showing only up to mode 3, I suspect they are not at release 26 as they indicated to me they were.

Unless they need to do something additional to activate the ALUA asymmetric active/active feature (mode 4) it may be a while before they are able to update the firmware.

I asked them to contact EMC for specific help with this issue.

Thanks again,
Scott

[Scott Giddens]

Turns out the storage group was incorrect when they told me they were on FLARE 26. Not sure how they could have made that mistake but I think I can say the problem was figured out.

Thanks everyone!
Scott

[Scott Giddens]

Thread closed

[Duncan Edmonstone]

Scott,

If you're not on GLARE26 but wanted an "unsupported" method to use 11iv3, have a look at this post:

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1135213

HTH

Duncan