Originally posted by: zhuli_pl

Does HACMP 5.4.1 concurrent support DS3400. Ant limitations?
I directly connected two p520 servers to DS3400 using FC. HACMP 5.4.1 is installed on the two P520. I defined the concurrent resource group in HACMP. when I start HACMP, I can see the concurrent VG is active on both node. When I do #lsvg concurrent_vg on one node, it works. Then I do the #lsvg concurrent_vg on the other node, it takes 2-3 minutes.

My OS level is: AIX 5.3.8-07
bos.rte.lvm.5.3.8.6
bos.clvm.enh.5.3.8.4

All HACMP 5.4.1 latest PTF has been applied.
The lsvg rootvg works. lsvg -L works.
Here is the scenario:
1.start HACMP concurrent on node1, all vg commands work on node1
2.start HACMP concurrent on node2, all vg commands work on node2. But
they take 2-3 minutes on node1 for the first time. After that, they work well on node1. Then they take 2-3 minutes on node2. After that they work well on node2 and they are slow on node1.
This repeats no matter on which node I start HACMP first.
It seems if one node has the lock, the other node will take a few minutes to get.

I checked the DS3400 and FC adapter firmware. They are up-to-date.
If only one node uses the DS3400, there are no errors.
If the other node tries vg commands, there are errors in errpt.

The FC adepter is 2GB, The DS3400 is 4GB. They connect directly.
Does this matter?
Any suggestion?
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Originally posted by: RosieK

Hi zhuli_pl,

The symptoms of LVM commands taking a long time sounds very much like an AIX defect I have come across in the past, but your are at a fairly recent service pack level. This is a question for your local AIX support centre, I would recommend that you raise a PMR.
The configuration you have sounds ok in theory to me, but without seeing it, it's hard to be 100% sure.
Check your errpt does not give any clues and bos.clvm.enh level is up to date.

Rosie Killeen
IBM UK
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Originally posted by: zhuli_pl

Thank you for your reply.
The PTF http://www-01.ibm.com/support/docview.wss?uid=isg1IZ02543 is:
bos.rte.lvm 5.3.7.0

My OS level is: AIX 5.3.8-07
bos.rte.lvm.5.3.8.6
bos.clvm.enh.5.3.8.4

All HACMP 5.4.1 latest PTF has been applied.
The lsvg rootvg works. lsvg -L works.
Here is the scenario:
1.start HACMP concurrent on node1, all vg commands work on node1
2.start HACMP concurrent on node2, all vg commands work on node2. But
they take 2-3 minutes on node1 for the first time. After that, they work well on node1. Then they take 2-3 minutes on node2. After that they work well on node2 and they are slow on node1.
This repeats no matter on which node I start HACMP first.
It seems if one node has the lock, the other node will take a few minutes to get.

I checked the DS3400 and FC adapter firmware. They are up-to-date.
If only one node uses the DS3400, there are no errors.
If the other node tries vg commands, there are errors in errpt.

The FC adepter is 2GB, The DS3400 is 4GB. They connect directly.
Does this matter?
#PowerHAforAIX
#PowerHA-(Formerly-known-as-HACMP)-Technical-Forum

Originally posted by: Casey_B

Hello Zhuli,

I don't know.

I think you would be best served by calling into IBM support

You mentioned that lsvg, and lsvg -L both work...Do they both have the same slowdown?
If so, then the issue is most likely not at the LVM level, and it could be the connections in your san.

If lsvg -L is not slow, then you might have a problem with LVM, and there might be an APAR that would
help.

Casey
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