Many years ago when I was using Lustre-1.8.X, I used to suffer the
same nightmare as you now. The following procedure saved me. But
I am not sure whether it works to you or not.
Thank you! I had found this recipe, but in new lustre versions it
does not work, ll_recover_lost_found_objs does not exists any more. I
have 2.12.2 installed.
As I understand, its function is integrated into lfsck procedure now.
But it does not work as I expect.
Can anybody give me a clue how to force this procedure? Should I stop
all clients and do lsfck with enabled broken OST? I do not want to
experiment, while I have tens of users and one week of lustre
unavailability without significant results looks very bad for me.
1. umount all the clients, umount OST.
2. mount OST as ldiskfs:
mount -t ldiskfs /dev/<OST_device> /mnt
3. Run the command:
ll_recover_lost_found_objs -d <lost+found_dir>
At that event it restored about 70% of data back.
In case that you want to remove the files which were lost in OST, but
unfortunately using "rm -f <filename>" does not work:
1. Record the full paths of the files which you want to remove.
2. umount all client, OST, and MDT.
3. Mount MDT as ldiskfs:
mount -t ldiskfs /dev/<MDT_device> /mnt
4. Go to /mnt/ROOT/. You will find the completed directory tree of
your Lustre file system, but without the file contents. You can
remove the files you want from here.
Cheers,
T.H.Hsieh
On Mon, Nov 30, 2020 at 01:09:07PM +0300, Sergey Zhumatiy wrote:
Hello!
Please, help to resolve... One ost on my lustre installation has been
failed. It lost all fs metadatam so I couldn't mount it as lustre
filesystem. I've checked it by e2fsck and all data was moved into lost+found
folder. Then I moved this folder to another storage, re-created this ost
(with old target index), then put back lost+found folder.
After mount this ost lustre, I've started lfsck on mds. In several hours I
disabled this ost, because no client can work. Then lustre become heathy,
and I started lfs_migrate from this ost.
But it seems, that data was not restored by lfsck and lfs_migrate moved a
few of files and the rest is 'endpoint not connected'.
How can I restore some data and delete unrecoverable data?
--
With respect
Serg.
_______________________________________________
lustre-discuss mailing list
lustre-discuss@lists.lustre.org
http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
--
С уважением
Serg.
_______________________________________________
lustre-discuss mailing list
lustre-discuss@lists.lustre.org
http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
