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 <pfarr...@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-boun...@lists.lustre.org> on > behalf of Richard Chang <rchang.li...@gmail.com> > *Sent:* Monday, February 4, 2019 6:38:57 AM > *To:* lustre-discuss@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. > _______________________________________________ > lustre-discuss mailing list > lustre-discuss@lists.lustre.org > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org > _______________________________________________ > lustre-discuss mailing list > lustre-discuss@lists.lustre.org > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org > -- Dr Stuart Midgley sdm...@gmail.com
_______________________________________________ lustre-discuss mailing list lustre-discuss@lists.lustre.org http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org