[lustre-discuss] Upgrade without losing data from 1.8.6 to 2.5.2 and back if necessary

[Stu Midgley]

We did an upgrade from 1.8.# to 2.5 and 2.7 about 2 years ago... all went
smoothly.

Good luck :)

On Mon, Feb 4, 2019 at 10:26 AM Patrick Farrell <pfarrell at whamcloud.com>
wrote:

> Wow, 1.8 is pretty old these days, as is 2.5 (first release 6 years
> ago!).  I hope you're planning on upgrading past 2.5 once you've upgraded
> to it.  (Honestly, this is all so old at this point you might consider
> letting your existing system reach EOL on 1.8.x and building a new file
> system (2.10 is a maintenance branch...) & migrating data.)
>
>
> Upgrade is possible and relatively easy.  Just shut down all your servers,
> upgrade the Lustre version, then start them as normal.  It is a good idea
> to upgrade your clients at the same time, but you can use 1.8.x clients
> with 2.5.  Not everything works - quota, notably, will not work right - but
> it is mostly fine.
>
>
> That's the first step of upgrading, and at this point you can easily roll
> back to 1.8.x.
>
>
> After that, it's more complicated.  I won't write it all up for you, but
> the manual has information on enabling dirdata and doing lfsck namespace,
> and also on enabling quotas, which is different in 2.5.  Once you enable
> dirdata (even without doing the namespace lfsck, which you should do), you
> cannot go back to 1.8.x.  (It is probably not safe to upgrade beyond 2.5.x
> without enabling dirdata, nor to downgrade from > 2.5.x to 1.8.x.  Those
> *might* work, but I wouldn't bet my data on it.)
>
>
> Section 17.2 in the manual has the relevant info.
>
>
> - Patrick
>
> ------------------------------
> *From:* lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on
> behalf of Richard Chang <rchang.lists at gmail.com>
> *Sent:* Monday, February 4, 2019 6:38:57 AM
> *To:* lustre-discuss at lists.lustre.org
> *Subject:* [lustre-discuss] Upgrade without losing data from 1.8.6 to
> 2.5.2 and back if necessary
>
> Hi,
>
> I currently have Lustre 1.8.6 running without much problem. I would like
> to upgrade to version 2.5.2, but without losing any data.
>
> Is it possible to upgrade from 1.8.6 => 2.5.2 and back to older version,
> in case of any problems.
>
> I am unable to find any documentation or any pointers for anyone having
> done any such thing. I mean, upgrade, and if facing any problem, revert
> back to older version.
>
> Is it possible at all, without losing any data ?
>
> Thanks & regards,
> Rick.
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-- 
Dr Stuart Midgley
sdm900 at gmail.com
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