planning upgrade from pacific to quincy

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Hi All
(apologies if you get again, I suspect mails from my @science.ru.nl
account get dropped by most receiving mail servers, due to the strict
DMARC policy (p=reject) in place)

after a long while being in health_err state (due to an unfound
object, which we eventually decided to "forget"), we are now planning
to upgrade our cluster which is running Pacific (at least on the
mons/mdss/osds, the gateways are by accident running quincy already).
The installation is via packages from ceph.com, unless it's quincy
from ubuntu.

ceph versions:
    "mon": {"ceph version 16.2.13
(5378749ba6be3a0868b51803968ee9cde4833a3e) pacific (stable)": 3},
    "mgr": {"ceph version 16.2.13
(5378749ba6be3a0868b51803968ee9cde4833a3e) pacific (stable)": 3},
    "osd": {"ceph version 16.2.13
(5378749ba6be3a0868b51803968ee9cde4833a3e) pacific (stable)": 252,
 "ceph version 16.2.14 (238ba602515df21ea7ffc75c88db29f9e5ef12c9)
pacific (stable)": 12 },
    "mds": { "ceph version 16.2.13
(5378749ba6be3a0868b51803968ee9cde4833a3e) pacific (stable)": 2 },
    "rgw": {"ceph version 17.2.6
(d7ff0d10654d2280e08f1ab989c7cdf3064446a5) quincy (stable)": 8 },
    "overall": {"ceph version 16.2.13
(5378749ba6be3a0868b51803968ee9cde4833a3e) pacific (stable)": 260,
        "ceph version 16.2.14
(238ba602515df21ea7ffc75c88db29f9e5ef12c9) pacific (stable)": 12,
        "ceph version 17.2.6
(d7ff0d10654d2280e08f1ab989c7cdf3064446a5) quincy (stable)": 8 }

The OS on the mons and mdss are still ubuntu 18.04, the osds are a mix
of ubuntu 18 and ubuntu 20. The gateways are ubuntu 22.04, which is
why these are already on quincy.

The plan is to move to quincy and eventually cephadm/containered ceph,
since that is apparently "the way to go", though I have my doubts.

The steps we think are the right order are:
- reinstall the mons with ubuntu 22.04 + quincy
- reinstall the osds (same)
- reinstall the mdss (same)

Once this is up and running, we want to investigate and migrate to
cephadm orchestration.

Alternative appear to be: move to orchestration first and then upgrade
ceph to quincy (possibly skipping the ubuntu upgrade?)

Another alternative could be to upgrade to quincy on ubuntu 18.04
using packages, but I haven't investigated the availability of quincy
packages for ubuntu 18.04 (which is out of free (LTS) support by
canonical)

Cheers

/Simon


-- 
I'm using my gmail.com address, because the gmail.com dmarc policy is
"none", some mail servers will reject this (microsoft?) others will
instead allow this when I send mail to a mailling list which has not
yet been configured to send mail "on behalf of" the sender, but rather
do a kind of "forward". The latter situation causes dkim/dmarc
failures and the dmarc policy will be applied. see
https://wiki.list.org/DEV/DMARC for more details
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