[lustre-discuss] syntax/guidance on lfsck

[Yong, Fan]

The full functionality of layout LFSCK for handling orphan OST-objects is available since Lustre-2.6.

Regards,
Nasf
-----Original Message-----
From: lustre-discuss [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Dilger, Andreas
Sent: Wednesday, December 14, 2016 7:03 AM
To: Jessica Otey <jotey at nrao.edu>
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] syntax/guidance on lfsck

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.

Cheers, Andreas
-- 
Andreas Dilger

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:

    All,
    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.
    
    Thanks,
    Jessica
    
    
    
    -- 
    Jessica Otey
    System Administrator II
    North American ALMA Science Center (NAASC)
    National Radio Astronomy Observatory (NRAO)
    Charlottesville, Virginia (USA)
    
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