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DSS iSCSI failover solved July 25, 2009

Posted by jamesisaac in Uncategorized.
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Two weeks ago I was in the throes of a confusing puzzle of how to make iSCSI failover work with the open-e DSS. I was searching for the magic switch that would make it work, and I found it – “it” being ASCII character 20h, 32 decimal, good ol’ space.

Here’s the rundown – the DSS high availability construction kit goes like this:

  1. Create a volume on your “source” DSS.
  2. Create an iSCSI lun in that volume.
  3. Create a replica volume on the “target” DSS (“target”, “replica”, whatever you want to call it)
  4. Create an identical iSCSI lun, same name, same lun number.
  5. Configure a volume replication job on your source DSS. Here’s the important thing: don’t create the job name with a space. So, “replicate lv0000” will work for the replication job, but it won’t even show up in the iSCSI failover job list. Create your job and call it “replicate_lv0000” instead.
  6. Start the replication job and wait until the volumes are synchronized.
  7. Configure iSCSI failover – you should see your replication job listed.

It’s amazing and a little disconcerting to think of all the time wasted because one part of the UI allowed a job with a space in the name, and another part of the UI wouldn’t list jobs with spaces in their names.

Now, arguably, I didn’t run this by support, nor have I seen the source code, so I may be barking up the wrong tree. All I know is that 20 hours later, the space character is the one change that I made which allowed everything else to work.



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