[lustre-discuss] syntax/guidance on lfsck
andreas.dilger at intel.com
Tue Dec 13 15:03:02 PST 2016
The lfsck in 2.5.3 does not verify/repair MDT->OST file layouts.
In order to delete the orphan OST objects you need to mark the OST active again on the MDS and restart the MDS. There were a couple of bugs fixed in this area in 2.9.0 (maybe 2.8.0 already, I can't recall offhand) so that this isn't needed in the future.
Lustre Principal Architect
Intel High Performance Data Division
On 2016/12/13, 14:04, "lustre-discuss on behalf of Jessica Otey" <lustre-discuss-bounces at lists.lustre.org on behalf of jotey at nrao.edu> wrote:
If there is anyone who has run as lfsck on a 2.5.3 system, I would
appreciate some guidance. The manual has only been of limited help.
The situation: We were draining and OST unaware that a but in 2.5.3
causes the inodes to remain--thus rendering the df readout inaccurate
(and therefore not useful).
The solution: This should be fixable via lfsck--it would simply compared
the inodes and the files and bring them back into the correct alignment
(i.e., delete the inodes that no longer correspond to data on the OST).
The specific issue: I don't know:
1) What exact lfsck command to issue
2) Where to issue it (mds, oss)
3) What to expect as far as output/how to interact with it
What I have done:
I had issued (on the oss) the following command:
[root at naasc-oss-6 ~]# lctl lfsck_start --device naaschpc-OST0014
Started LFSCK on the device naaschpc-OST0014.
But the prompt just returns, as if it either done or it is doing
something in the background?
I don't understand how to tell what it is doing. When I tried to stop
it, I got:
[root at naasc-oss-6 ~]# lctl lfsck_stop --device naaschpc-OST0014
Fail to stop LFSCK: Operation already in progress
Any help interpreting these messages as well as coming up with the
proper command to run to correct our inode issue would be helpful.
Please keep in mind that many features described in the 2.x manual
aren't available because we are only using 2.5.3. (For instance, the
--type layout option, which seems to be what we want (check and repair
MDT-OST inconsistency) is not available until 2.6.
System Administrator II
North American ALMA Science Center (NAASC)
National Radio Astronomy Observatory (NRAO)
Charlottesville, Virginia (USA)
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