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March 12th, 2010 05:00
MD3000i Second Enclosure - No Path Redundancy?
I have an md3000i connected to a second md1000 chassis with two cables in a redundant fashion as shown in the admin guide. one cable from the md3000i controller 0 out port to the in port of controller 0 on the md1000 and same for controller 1 on the md3000i and md1000.
The recovery guru states 'virtual disk not on preferred path' with two volumes created. One on the md3000i and one on the md1000. Yet i re-created the volumes and let the array set them automatically. I can manually move the referenced volume to the preferred path and the error goes away, but why would that not have been the preferred path to begin with? It makes sense that each new volume path is assigned to the opposite controller for successful load balancing. This brings me to my second issue which seems related.
The recovery guru is showing the following error: Physical path loss of redundancy. Its stating disk 14 on expansion enclosure 1.
Status is optimal,
component requiring service: 14
service action required (removal) allowed: No X
working channel: -1
The disk is not flashing orange as if it was bad, and there were no predictive failure reports through openmanage on this disk when the array was directly attached to a host yesterday where it lived for the past six months. So Im confused. Is it trying to tell me the drive is bad, or is is trying to say there is something wrong with the configuration for multi-path redundancy between array controllers due to a cable or configuration issue? If its a config issue in the cables or something, is that i have two cables connected between both chassis and i should have only one?
Thanks
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Dev Mgr
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9.3K Posts
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March 12th, 2010 07:00
Check the front of the MD1000. There's an EMM setting slider on the left side. This has to be set to the "single drum" option. To make this change, you can slide it over, but it takes a powercycle (of the MD1000) to take affect.
If this slider is indeed in the 'double drum' position currently, I'd recommend:
- plan for an outage
- shut down any attached servers (attached to the MD3000i)
- power down the MD3000i
- power down the MD1000
- slide over the switch (may want to also do this on the MD3000i chassis, though the raid controllers end up ignoring this slider anyway if you don't)
- power up the MD1000 and wait 30-60 seconds
- power up the MD3000i and wait 1-2 minutes
- check MDSM (if it's not only on the servers) to make sure the fault in question is gone
- power up your servers
canada-it
102 Posts
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March 12th, 2010 08:00
Its in single host mode not split, so all 15 disks are accessible to a single host.
Any other thoughts?
mrokkam
154 Posts
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March 19th, 2010 11:00
Virtual Disk not on Preferred Path is typically due to cabling or configuration problems. The single/split mode does not affect the MD3000i. I would recommend that you check your cabling and the iSCSI session (ensure that sessions are set correctly from all host source ports to all ports on the MD3000i
The recovery guru page that comes up should walk you through many of the things to check.
-Mohan