5:22 a.m.
On 2013/10/11 3:50 PM, "Kumar, Amit" <ahkumar(a)mail.smu.edu> wrote:
Here is where the script is stuck: Script is the one in this
document:
http://wiki.lustre.org/manual/LustreManual18_HTML/LustreOperatingTips.html
# ./MOVE.sh -O hpc-OST0031_UUID /lustre
+ CKSUM=md5sum
+ getopts O: opt -O hpc-OST0031_UUID /lustre
+ case $opt in
+ OST_PARAM=' -O hpc-OST0031_UUID'
+ getopts O: opt -O hpc-OST0031_UUID /lustre
+ shift 2
+ MVDIR=/lustre
+ '[' 1 -ne 1 -o '!' -d /lustre ']'
+ read OLDNAME
+ lfs find -type f -O hpc-OST0031_UUID /lustre
The above Process does not proceed any further?
It is traversing the filesystem looking for files on this OST. If you
stop and
start the script it has to re-start the scan of the filesystem, so it will
not
do find any files at the beginning.
You could also verify it is actually doing something by stracing this
process:
strace -p $(pidof lfs)
and CTRL-C to stop the strace (that doesn't affect lfs).
I have multiple OST¹s being migrated at the same time, could this be
an
issue?
You can specify multiple source OSTs for migrating at one time, to avoid
the need
to scan the filesystem multiple times. That reduces load on the MDS and
speeds
up the scanning. Unfortunately, this would also require restarting your
scan, so
it is unlikely be faster than leaving the current scans running.
Cheers, Andreas
From: hpdd-discuss-bounces(a)lists.01.org
[mailto:hpdd-discuss-bounces@lists.01.org]
On Behalf Of Kumar, Amit
Sent: Friday, October 11, 2013 4:25 PM
To: hpdd-discuss(a)lists.01.org
Subject: Re: [HPDD-discuss] lfs find stuck
Another strange thing is when I am running the migrate script, the usage
on OST is increasing instead of decreasing, I have not seen this behavior
before, hope
somebody can throw some light on this.
Regards,
Amit
From:hpdd-discuss-bounces@lists.01.org
[mailto:hpdd-discuss-bounces@lists.01.org]
On Behalf Of Kumar, Amit
Sent: Friday, October 11, 2013 3:44 PM
To: hpdd-discuss(a)lists.01.org
Subject: [HPDD-discuss] lfs find stuck
Dear All,
I have deactivated an OST, so that I can migrate data off of it.
For some strange reason when I try to run the migration script against
this one OST, I do not see it doing anything for almost eternity.
When I the same process with strace, I see it is trying to open files and
move to next file. But I do not see it moving any files at all, this OST
is 60% full,
so I know for sure file exists.
Can anybody help me understand this.
Q) Do you think it can take hours together to find the first file to move?
Any tips to debug this issue?
Thank you,
Amit
Cheers, Andreas
--
Andreas Dilger
Lustre Software Architect
Intel High Performance Data Division