[LU-3886] sanity test_56a: @@@@@@ FAIL: /usr/bin/lfs getstripe --obd wrong: found 6, expected 3

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Major
• Affects Version/s: Lustre 2.5.0
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Li Xi (Inactive)

Description

This problem is similar with LU-3846 and LU-3858. The test suit should wait for a few seconds after it clear the stripe of the directory. Otherwise, the newly created entries under the directory will have 2 stripe counts rather than 1.

Issue Links

• is duplicated by: LU-7071 Interop 2.5.3<->master DNE: sanity test_56a failed: /usr/bin/lfs getstripe --obd wrong: found 6, expected 2
• is related to: LU-3846 Sanity 56u error with two OSTs
• is related to: LU-3858 sanity test_27A: @@@@@@ FAIL: stripe count -1 != 1

Comments

[Li Xi (Inactive)]

Oh, sorry, plase run on lustre mount point '/mnt/lustre' rather than its directory '/mnt/lustre/dir', i.e. sh run.sh /mnt/lustre/

I got following output:

No error after 640 iters
-1 != 1
Does not become correct after 0 seconds
Does not become correct after 1 seconds
Does not become correct after 2 seconds
Does not become correct after 3 seconds
Does not become correct after 4 seconds
Does not become correct after 5 seconds
Does not become correct after 6 seconds
Become correct after 7 seconds

[Emoly Liu]

I just ran the script of "https://jira.hpdd.intel.com/secure/attachment/13414/run.sh" on my local VM. It showed me 10000 times "No errors after xxx iters".

My step is:
1. mount lustre
2. mkdir /mnt/lustre/d
3. sh run.sh /mnt/lustre/d

I tried several times, no error happened.

[Li Xi (Inactive)]

What is interesting is that when I add a sleep into the test suit, the problem is gone. That makes me believe that the problem is similar with LU-3858. Emoly, would you please check the attachment of LU-3858 first? I.e. https://jira.hpdd.intel.com/secure/attachment/13414/run.sh. It shows that the effect of default stripe is delayed. Thanks!

test_56a() { # was test_56
rm -rf $DIR/$tdir
$SETSTRIPE -d $DIR
test_mkdir -p $DIR/$tdir/dir
NUMFILES=3
NUMFILESx2=$(($NUMFILES * 2))
sleep 10 # This will fix the problem.
for i in `seq 1 $NUMFILES` ; do
touch $DIR/$tdir/file$i
touch $DIR/$tdir/dir/file$i
done
......

[Li Xi (Inactive)]

I've post the script (run-sanity.sh) to hit this problem (and LU-3858, LU-3846). It will hit the problem every time it runs.

[Emoly Liu]

"lfs setstripe -d" should be enough to clear directory striping information. LiXi, could you tell me how you hit this problem?

IMO, we can add "lfs getstripe -v" after "setstripe -d" to print that striping information, and see if this problem will happen again.

[Peter Jones]

Emoly

Could you please comment on this one?

Thanks

Peter