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Raw drive mappings not showing in ESX VM server

Posted on 2011-09-09
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Last Modified: 2012-07-29
Hi Experts

I have an IBM HS21 chassis with 4 ESXi 4 hosts with Vsphere 4.1 with 2 IBM SANs in the chassis
I am planning to implement a SQL cluster using 2 Win Enterprise 2008 R2 servers with SQL 2008 and a Dell MD3200i SAN.

1 x 160Gb for SQL
1 x 250GB for Logs
1x 200MB for Quorum

I have read thought the document from end to end on how to do this http://www.vmware.com/pdf/vsphere4/r40/vsp_40_mscs.pdf 

The Dell SAN has been in use for the past 9 months.

I have built the 2 cluster servers, but the problem is that the RDMs are very temperamental on presenting themselves to the VM servers when building them.

I can see them on the attach RDM option fine, and 1 will attach, sometimes 2, and I can get 1 to attach on the second cluster.

When I try to add the 3rd RDM, it appears in the settings box and the scsi bus is set to shared but the RDM never appears in the storage manager.

On cluster 2, I can maybe get 1 to appear, the rest never do. If I look at the property settings on both servers, they are all present with shared bus, but windows doesn’t see them.
If I remove all the RDM and start again, or try and attach them anew to another spare test server, they still refuse to all appear.

Any help would be great as I have been struggling for 3 days now and pulling my hair out!
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Question by:deanwilsons
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10 Comments
 
LVL 16

Expert Comment

by:danm66
ID: 36510132
I would start with verifying what each host sees by running the esxcfg-scsidevs commands shown in the following KB - Identifying disks when working with VMware ESX (http://kb.vmware.com/kb/1014953)

Also, are your hosts updated with the latest patches for 4.1?
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Expert Comment

by:BloodRed
ID: 36510200
When you add the RDMs, are you attaching them to the second SCSI adapter on the VM? 1:0, 1:1 and 1:2 and using the same SCSI IDs for both VMs?
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Author Comment

by:deanwilsons
ID: 36510967
Will try the esxcfg-scsidevs commands shortly.

i am adding them as follows.

Harddisk 1 SCSI ID 1.0 on server1
Harddisk 1 SCSI ID 1.0 on server2

Harddisk 2 SCSI ID 2.0 on server1
Harddisk 2 SCSI ID 2.0 on server2

but i have never been able to add them in that manner, although it all appears ok in the VM settings.

Even before i add them to the second though, they dont all appear in the first VM.
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Author Comment

by:deanwilsons
ID: 36528591
do the commands in (http://kb.vmware.com/kb/1014953) have to be ran direct on the console? as i am 200 miles away from the site, and SSH is not enabled. can they be ran from powercli?
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Expert Comment

by:danm66
ID: 36530505
I believe get-scsilun will give most of the same info - http://www.vmware.com/support/developer/PowerCLI/PowerCLI41U1/html/index.html
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Author Comment

by:deanwilsons
ID: 36535310
When i tried to add the RDM this time i get Disk not initialized, and then incorrect function when i attempt to initialize it.

i have had this a couple of times with the RDM, and wondering if its all linked.

i will have to park this for the next 12 days or so, as on leave but will pick it back up once i return.
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LVL 16

Expert Comment

by:danm66
ID: 36537082
if you are using different groups on the SAN for presentation of the LUN, make sure that you are using the same LUN number for each host.
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Author Comment

by:deanwilsons
ID: 36890765
Sorry in the delay in responding, been on leave.

Danm66 - yes they are all on the same lun number for each host.

using powercli, i can get the disks for the vmhost, but not the actual vmserver though.

can i say i have never used powercli before, so totally out of water here!

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Accepted Solution

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deanwilsons earned 0 total points
ID: 37501292
once again, apologies for the massive delay in this, i clean forgot the question was still open.
the problem turned out to be the DELL SAN itself, as it returned the same error on some normal iscsi mappings to physical servers.

in the end, we replaced the san with a dell equal logic, and the issue went away.
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Author Closing Comment

by:deanwilsons
ID: 38235319
No answers that resolved the issue found.
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