SUMMARY (Partial Update 2) Distributed ZFS pools

From: joe fletcher <>
Date: Wed Jun 03 2009 - 10:28:44 EDT

Just as an FYI I've got something which pretty much does the job I want. I've
only got it working on a small scale pilot but the important thing is that it
works. I've just used out-of-the-box iSCSI, no additional hardware, no
specialist switches and at this stage I'm still on entry-level servers.

The structure is thus:

TargetA on one site, TargetB on another, Initiator1 (can be on either site).
I created identical targets on the two target servers, ran the device
discovery on Initiator1 and picked up the iscsi LUNs. I then created a ZFS
mirror pool using the devices from the two sites, added a file system, mounted
it and away it went. Performance isn't spectacular (30MB/s write speeds seem
typical) but at this stage I'm still only using the internal disks in a couple
of HP DL360s. Next stage is to use SAN disks for the target devices.

I still need to test the resilience more extensively. I think the whole thing
blocks if one of the targets disappears but there may be workarounds for this.
It's all still a work in progress.

Still, its a start.


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Received on Wed Jun 3 10:29:19 2009

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