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Date:      Thu, 14 Jun 2018 14:53:25 +0100
From:      Frank Leonhardt <frank2@fjl.co.uk>
To:        freebsd-questions@freebsd.org
Subject:   Re: upgrade of an iSCSI zpool mirror
Message-ID:  <7ea3c3d0b1d05b032ff99fe977cf7a69@roundcube.fjl.org.uk>
In-Reply-To: <20180611130407.GT48472@mordor.lan>
References:  <20180611130407.GT48472@mordor.lan>

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On 2018-06-11 14:04, Julien Cigar wrote:
> Hello,
> 
> 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 
> read-only
> available. I planned to do something like:

> Has anyone ever done something similar and/or does it sound good to 
> you?

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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