Date: Thu, 14 Jun 2018 16:28:14 +0200 From: Julien Cigar <julien@perdition.city> To: Frank Leonhardt <frank2@fjl.co.uk> Cc: freebsd-questions@freebsd.org Subject: Re: upgrade of an iSCSI zpool mirror Message-ID: <20180614142813.GB62135@mordor.lan> In-Reply-To: <7ea3c3d0b1d05b032ff99fe977cf7a69@roundcube.fjl.org.uk> References: <20180611130407.GT48472@mordor.lan> <7ea3c3d0b1d05b032ff99fe977cf7a69@roundcube.fjl.org.uk>
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--b5gNqxB1S1yM7hjW Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jun 14, 2018 at 02:53:25PM +0100, Frank Leonhardt wrote: > On 2018-06-11 14:04, Julien Cigar wrote: > > Hello, > >=20 > > 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> > >=20 > > 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=20 > > read-only > > available. I planned to do something like: >=20 > > Has anyone ever done something similar and/or does it sound good to=20 > > you? >=20 > I've tried various combinations, but not that one I'm afraid. I'm not a= =20 > fan of iSCSI except as a work-around, but FWIW I can't spot anything=20 > wrong with your plan, but I'm not sure where NFS fits in. >=20 > You will probably want to upgrade the zpools at some point (optional). >=20 After some exchanges with people smarter than me in this area I got the confirmation that "There's no issue with the upgrade path." :) > I've yet to get a fully redundant ZFS implementation up and running, as= =20 > other solutions have been more useful - such as sending incremental=20 > datasets to a backup at a different location. I've also run it on top of= =20 > HAST, but it scared me. Yes, in fact all of this started after a question I started on freebsd-fs@ some years ago: https://lists.freebsd.org/pipermail/freebsd-fs/2016-June/023456.html To my suprise I had a lot of answers and it was an interresting discussion, you may want to check the whole thread if interested. >=20 > One day I plan to look at heartbeat/pacemaker (available in ports/net),= =20 > which is supposed to be the thing for it. >=20 Yep, I had an interresting exchange on IRC (#freebsd freenode) about it some days ago. It would be better than using a CARP only based solution to failover (which is quite easy to split brain). > In your situation, I think I'd proceed as follows: >=20 > 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. >=20 As a security measure I have already a third "replication machine"=20 which zrep from the master, I could make the pool read-only from it > They relax and do whatever I wanted to reconfigure the rack servers. >=20 > Just a thought! Thanks :) >=20 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o= rg" --=20 Julien Cigar Belgian Biodiversity Platform (http://www.biodiversity.be) PGP fingerprint: EEF9 F697 4B68 D275 7B11 6A25 B2BB 3710 A204 23C0 No trees were killed in the creation of this message. However, many electrons were terribly inconvenienced. --b5gNqxB1S1yM7hjW Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEE7vn2l0to0nV7EWolsrs3EKIEI8AFAlsie3oACgkQsrs3EKIE I8AYwhAA693hEsSN2CYtSsRP7dhueGUUsGdkxXioDq7uBZpDQS48AUvJ2DcQXH9E f89SSBaWHIx3y6a/jqDEl3AdUum4ehJNgyOiUv5vYdIj0auGX1SkoLSRWOH8wpeo xrcuAyQNnb8vYmMXvq/9r2NYiI/FT4T3qBS4DzPdFzkDTF4NXv/Z7tLGH3z6pbJs 30JiM38Kew4kLVJmy0l/75Soxo3SUPRaayQ8uJFs89idjk+00hFEoC+XF2HE/Avu Qg/zLVEGZDpiiDgKFNAm9OCt1PTXmtrCGCPnSdEjMPEoyLB5nd0ByqLmduFcIY0o jle99yqHZcyCtNNBTJsBhvjJgqovxnXJsHgPyrrx5Sk8RBR4jHMSLtqUd4qOJgBt bi8hbgwrIeKpSn+SKJckHucoQGxEzUhaTSAmN7r485RY6pB5PeQSUTEQ06QOJHy7 5NCp1jr5MQ0mvszCGY27+WrLUnz62SIzjEIpy0ELF/rnwJJYmKJ82vz4mhpkT+ez PozepgVr7lCVdpzulGluR8/vFWYjdM9J4f6vv+nsznjHrU6gLWb4djUWKZxDGQGD pN8XGCSdfEi8m9mnIAVzT7z/98hOxcuMp0NCsmeXWr+8OeAwiKwp7NKe/5/dm6JC 1Zl9/y9gU5L/ZUPq7AGGvM78bZjVZ7lPHuDL5b/hjakSNiZ+e2A= =BrEz -----END PGP SIGNATURE----- --b5gNqxB1S1yM7hjW--
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