upgrade of an iSCSI zpool mirror
frank2 at fjl.co.uk
Thu Jun 14 13:53:32 UTC 2018
On 2018-06-11 14:04, Julien Cigar wrote:
> We have a "low-cost" active/passive HA ZFS based filer (with
> NFS4/SMB/... on top) which consist of two tiny HP Proliant DL20
> with 2 x 2 To disks in each. <snip>
> It works well, but those are still running FreeBSD 10.3 and I'd like to
> upgrade to 11.x. During the upgrade process the pool should be
> available. I planned to do something like:
> Has anyone ever done something similar and/or does it sound good to
I've tried various combinations, but not that one I'm afraid. I'm not a
fan of iSCSI except as a work-around, but FWIW I can't spot anything
wrong with your plan, but I'm not sure where NFS fits in.
You will probably want to upgrade the zpools at some point (optional).
I've yet to get a fully redundant ZFS implementation up and running, as
other solutions have been more useful - such as sending incremental
datasets to a backup at a different location. I've also run it on top of
HAST, but it scared me.
One day I plan to look at heartbeat/pacemaker (available in ports/net),
which is supposed to be the thing for it.
In your situation, I think I'd proceed as follows:
Set up a spare machine (e.g. desktop).
Do a zfs send <zoot-dataset> to it.
Turn off samba/nfs
Do a zfs send <zoot-dataset> of any last minute changes.
Make the spare machine live, but read-only.
They relax and do whatever I wanted to reconfigure the rack servers.
Just a thought!
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