[lustre-discuss] [EXTERNAL] [BULK] Re: Ongoing issues with quota

Andreas Dilger adilger at whamcloud.com
Tue Oct 17 14:23:17 PDT 2023 

The files reported in .lustre/lost+found *ARE* the objects on the OSTs (at least when accessed through a Lustre mountpoint, not if accessed directly on the MDT mounted as ldiskfs), so when they are deleted the space on the OSTs will be freed.

As for identification, the OST objects do not have any name information, but they should have UID/GID/PROJID and timestamps that might help identification.

Cheers, Andreas

On Oct 18, 2023, at 03:42, Daniel Szkola <dszkola at fnal.gov<mailto:dszkola at fnal.gov>> wrote:

OK, so I did find the hidden .lustre directory (thanks Darby) and there are many, many files in the lost+found directory. I can run ’stat’ on them and get some info. Is there anything else I can do to tell what these were? Is it safe to delete them? Is there anyway to tell if there are matching files on the OST(s) that also need to be deleted?

—
Dan Szkola
FNAL

On Oct 10, 2023, at 3:44 PM, Vicker, Darby J. (JSC-EG111)[Jacobs Technology, Inc.] <darby.vicker-1 at nasa.gov<mailto:darby.vicker-1 at nasa.gov>> wrote:

I don’t have a .lustre directory at the filesystem root.

It's there, but doesn't show up even with 'ls -a'.  If you cd into it or ls it, it's there.  Lustre magic.  :)

-----Original Message-----
From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org<mailto:lustre-discuss-bounces at lists.lustre.org> <mailto:lustre-discuss-bounces at lists.lustre.org>> on behalf of Daniel Szkola via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org> <mailto:lustre-discuss at lists.lustre.org>>
Reply-To: Daniel Szkola <dszkola at fnal.gov<mailto:dszkola at fnal.gov> <mailto:dszkola at fnal.gov>>
Date: Tuesday, October 10, 2023 at 2:30 PM
To: Andreas Dilger <adilger at whamcloud.com<mailto:adilger at whamcloud.com> <mailto:adilger at whamcloud.com>>
Cc: lustre <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org> <mailto:lustre-discuss at lists.lustre.org>>
Subject: [EXTERNAL] [BULK] Re: [lustre-discuss] Ongoing issues with quota


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Hello Andreas,


lfs df -i reports 19,204,412 inodes used. When I did the full robinhood scan, it reported scanning 18,673,874 entries, so fairly close.


I don’t have a .lustre directory at the filesystem root.


Another interesting aspect of this particular issue is I can run lctl lfsck and every time I get:


layout_repaired: 1468299


But it doesn’t seem to be actually repairing anything because if I run it again, I’ll get the same or a similar number.


I run it like this:
lctl lfsck_start -t layout -t namespace -o -M lfsc-MDT0000


—
Dan Szkola
FNAL




On Oct 10, 2023, at 10:47 AM, Andreas Dilger <adilger at whamcloud.com<mailto:adilger at whamcloud.com> <mailto:adilger at whamcloud.com>> wrote:

There is a $ROOT/.lustre/lost+found that you could check.

What does "lfs df -i" report for the used inode count? Maybe it is RBH that is reporting the wrong count?

The other alternative would be to mount the MDT filesystem directly as type ZFS and see what df -i and find report?

Cheers, Andreas

On Oct 10, 2023, at 22:16, Daniel Szkola via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org> <mailto:lustre-discuss at lists.lustre.org>> wrote:

OK, I disabled, waited for a while, then reenabled. I still get the same numbers. The only thing I can think is somehow the count is correct, despite the huge difference. Robinhood and find show about 1.7M files, dirs, and links. The quota is showing a bit over 3.1M inodes used. We only have one MDS and MGS. Any ideas where the discrepancy may lie? Orphans? Is there a lost+found area in lustre?

—
Dan Szkola
FNAL


On Oct 10, 2023, at 8:24 AM, Daniel Szkola <dszkola at fnal.gov<mailto:dszkola at fnal.gov> <mailto:dszkola at fnal.gov>> wrote:

Hi Robert,

Thanks for the response. Do you remember exactly how you did it? Did you bring everything down at any point? I know you can do this:

lctl conf_param fsname.quota.mdt=none

but is that all you did? Did you wait or bring everything down before reenabling? I’m worried because that allegedly just enables/disables enforcement and space accounting is always on. Andreas stated that quotas are controlled by ZFS, but there has been no quota support enabled on any of the ZFS volumes in our lustre filesystem.

—
Dan Szkola
FNAL

On Oct 10, 2023, at 2:17 AM, Redl, Robert <Robert.Redl at lmu.de<mailto:Robert.Redl at lmu.de> <mailto:Robert.Redl at lmu.de>> wrote:

Dear Dan,

I had a similar problem some time ago. We are also using ZFS for MDT and OSTs. For us, the used disk space was reported wrong. The problem was fixed by switching quota support off on the MGS and then on again.

Cheers,
Robert

Am 09.10.2023 um 17:55 schrieb Daniel Szkola via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org> <mailto:lustre-discuss at lists.lustre.org>>:

Thanks, I will look into the ZFS quota since we are using ZFS for all storage, MDT and OSTs.

In our case, there is a single MDS/MDT. I have used Robinhood and lfs find (by group) commands to verify what the numbers should apparently be.

—
Dan Szkola
FNAL

On Oct 9, 2023, at 10:13 AM, Andreas Dilger <adilger at whamcloud.com<mailto:adilger at whamcloud.com> <mailto:adilger at whamcloud.com>> wrote:

The quota accounting is controlled by the backing filesystem of the OSTs and MDTs.

For ldiskfs/ext4 you could run e2fsck to re-count all of the inode and block usage.

For ZFS you would have to ask on the ZFS list to see if there is some way to re-count the quota usage.

The "inode" quota is accounted from the MDTs, while the "block" quota is accounted from the OSTs. You might be able to see with "lfs quota -v -g group" to see if there is one particular MDT that is returning too many inodes.

Possibly if you have directories that are striped across many MDTs it would inflate the used inode count. For example, if every one of the 426k directories reported by RBH was striped across 4 MDTs then you would see the inode count add up to 3.6M.

If that was the case, then I would really, really advise against striping every directory in the filesystem. That will cause problems far worse than just inflating the inode quota accounting.

Cheers, Andreas

On Oct 9, 2023, at 22:33, Daniel Szkola via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org> <mailto:lustre-discuss at lists.lustre.org>> wrote:

Is there really no way to force a recount of files used by the quota? All indications are we have accounts where files were removed and this is not reflected in the used file count in the quota. The space used seems correct but the inodes used numbers are way high. There must be a way to clear these numbers and have a fresh count done.

—
Dan Szkola
FNAL

On Oct 4, 2023, at 11:37 AM, Daniel Szkola via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org> <mailto:lustre-discuss at lists.lustre.org>> wrote:

Also, quotas on the OSTS don’t add up to near 3 million files either:

[root at lustreclient scratch]# ssh ossnode0 lfs quota -g somegroup -I 0 /lustre1
Disk quotas for grp somegroup (gid 9544):
Filesystem kbytes quota limit grace files quota limit grace
1394853459 0 1913344192 - 132863 0 0 -
[root at lustreclient scratch]# ssh ossnode0 lfs quota -g somegroup -I 1 /lustre1
Disk quotas for grp somegroup (gid 9544):
Filesystem kbytes quota limit grace files quota limit grace
1411579601 0 1963246413 - 120643 0 0 -
[root at lustreclient scratch]# ssh ossnode1 lfs quota -g somegroup -I 2 /lustre1
Disk quotas for grp somegroup (gid 9544):
Filesystem kbytes quota limit grace files quota limit grace
1416507527 0 1789950778 - 190687 0 0 -
[root at lustreclient scratch]# ssh ossnode1 lfs quota -g somegroup -I 3 /lustre1
Disk quotas for grp somegroup (gid 9544):
Filesystem kbytes quota limit grace files quota limit grace
1636465724 0 1926578117 - 195034 0 0 -
[root at lustreclient scratch]# ssh ossnode2 lfs quota -g somegroup -I 4 /lustre1
Disk quotas for grp somegroup (gid 9544):
Filesystem kbytes quota limit grace files quota limit grace
2202272244 0 3020159313 - 185097 0 0 -
[root at lustreclient scratch]# ssh ossnode2 lfs quota -g somegroup -I 5 /lustre1
Disk quotas for grp somegroup (gid 9544):
Filesystem kbytes quota limit grace files quota limit grace
1324770165 0 1371244768 - 145347 0 0 -
[root at lustreclient scratch]# ssh ossnode3 lfs quota -g somegroup -I 6 /lustre1
Disk quotas for grp somegroup (gid 9544):
Filesystem kbytes quota limit grace files quota limit grace
2892027349 0 3221225472 - 169386 0 0 -
[root at lustreclient scratch]# ssh ossnode3 lfs quota -g somegroup -I 7 /lustre1
Disk quotas for grp somegroup (gid 9544):
Filesystem kbytes quota limit grace files quota limit grace
2076201636 0 2474853207 - 171552 0 0 -


—
Dan Szkola
FNAL

On Oct 4, 2023, at 8:45 AM, Daniel Szkola via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org> <mailto:lustre-discuss at lists.lustre.org>> wrote:

No combination of ossnodek runs has helped with this.

Again, robinhood shows 1796104 files for the group, an 'lfs find -G gid' found 1796104 files as well.

So why is the quota command showing over 3 million inodes used?

There must be a way to force it to recount or clear all stale quota data and have it regenerate it?

Anyone?

—
Dan Szkola
FNAL


On Sep 27, 2023, at 9:42 AM, Daniel Szkola via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org> <mailto:lustre-discuss at lists.lustre.org>> wrote:

We have a lustre filesystem that we just upgraded to 2.15.3, however this problem has been going on for some time.

The quota command shows this:

Disk quotas for grp somegroup (gid 9544):
Filesystem used quota limit grace files quota limit grace
/lustre1 13.38T 40T 45T - 3136761* 2621440 3670016 expired

The group is not using nearly that many files. We have robinhood installed and it show this:

Using config file '/etc/robinhood.d/lustre1.conf'.
group, type, count, volume, spc_used, avg_size
somegroup, symlink, 59071, 5.12 MB, 103.16 MB, 91
somegroup, dir, 426619, 5.24 GB, 5.24 GB, 12.87 KB
somegroup, file, 1310414, 16.24 TB, 13.37 TB, 13.00 MB

Total: 1796104 entries, volume: 17866508365925 bytes (16.25 TB), space used: 14704924899840 bytes (13.37 TB)

Any ideas what is wrong here?

—
Dan Szkola
FNAL

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Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Whamcloud







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