[ceph-users] Running Jewel and Luminous mixed for a longer period

Yehuda Sadeh-Weinraub yehuda at redhat.com
Wed Dec 6 01:25:11 PST 2017


Are you using rgw? There are certain compatibility issues that you
might hit if you run mixed versions.

Yehuda

On Tue, Dec 5, 2017 at 3:20 PM, Wido den Hollander <wido at 42on.com> wrote:
> Hi,
>
> I haven't tried this before but I expect it to work, but I wanted to check before proceeding.
>
> I have a Ceph cluster which is running with manually formatted FileStore XFS disks, Jewel, sysvinit and Ubuntu 14.04.
>
> I would like to upgrade this system to Luminous, but since I have to re-install all servers and re-format all disks I'd like to move it to BlueStore at the same time.
>
> This system however has 768 3TB disks and has a utilization of about 60%. You can guess, it will take a long time before all the backfills complete.
>
> The idea is to take a machine down, wipe all disks, re-install it with Ubuntu 16.04 and Luminous and re-format the disks with BlueStore.
>
> The OSDs get back, start to backfill and we wait.
>
> My estimation is that we can do one machine per day, but we have 48 machines to do. Realistically this will take ~60 days to complete.
>
> Afaik running Jewel (10.2.10) mixed with Luminous (12.2.2) should work just fine I wanted to check if there are any caveats I don't know about.
>
> I'll upgrade the MONs to Luminous first before starting to upgrade the OSDs. Between each machine I'll wait for a HEALTH_OK before proceeding allowing the MONs to trim their datastore.
>
> The question is: Does it hurt to run Jewel and Luminous mixed for ~60 days?
>
> I think it won't, but I wanted to double-check.
>
> Wido
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