VM Junkie

January 27, 2009

Now that’s what I call multipathing!

Filed under: esx, vmware — ermac318 @ 5:08 pm

Saw something really interesting at a customer last week. Customer was using a storage vendor I didn’t have a lot of experience with (Compellant), and they said they were using software iSCSI as a backup to Fiber Channel because they only had one FC hookup on their storage. I told them this was probably a pretty bad idea, because if they did have to failover they would see some serious performance impact. However, what was the most surprising to me was that what they had setup actually worked. Look at this output:

Disk vmhba2:3:18 /dev/sdd (1048576MB) has 2 paths and policy of Fixed
FC 16:0.0 10000000c95ffcca<->5000d310000abd0b vmhba2:3:18 On active preferred
iScsi sw iqn.1998-01.com.vmware:mtahost31-4224a6b9<->iqn.2002-03.com.compellent:5000d310000abd03 vmhba32:0:18 On
Disk vmhba2:0:0 /dev/sdb (1048576MB) has 2 paths and policy of Fixed
FC 16:0.0 10000000c95ffcca<->5000d310000abd17 vmhba2:0:0 On active preferred
iScsi sw iqn.1998-01.com.vmware:mtahost31-4224a6b9<->iqn.2002-03.com.compellent:5000d310000abd10 vmhba32:2:0 On
Disk vmhba2:3:19 /dev/sdf (1048576MB) has 2 paths and policy of Fixed
FC 16:0.0 10000000c95ffcca<->5000d310000abd0b vmhba2:3:19 On active preferred
iScsi sw iqn.1998-01.com.vmware:mtahost31-4224a6b9<->iqn.2002-03.com.compellent:5000d310000abd03 vmhba32:0:19 On
Disk vmhba2:0:1 /dev/sdc (512000MB) has 2 paths and policy of Fixed
FC 16:0.0 10000000c95ffcca<->5000d310000abd17 vmhba2:0:1 On active preferred
iScsi sw iqn.1998-01.com.vmware:mtahost31-4224a6b9<->iqn.2002-03.com.compellent:5000d310000abd10 vmhba32:2:1 On

Now I have no idea if this is a supported configuration (my money is on not supported), but the customer said they had done failover testing before and it kept chugging just fine. Now that’s multipathing!

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1 Comment

  1. Thats pretty impressive, but as you said, probably not supported. I’d be highly surprised if it was.

    Comment by michaelmohr — January 30, 2009 @ 12:49 am


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