[lustre-discuss] lfs_migrate issue

Jason Williams jasonw at jhu.edu
Wed Jan 16 06:49:13 PST 2019

Hello Ahmed,

I'm rather new to the lfs_migrate command as well, but one thing to double check is after you run the migrate, have you done an

lfs getstripe

for a couple of the files it thinks it migrated to make sure they moved off of the OST?  Also, did you properly disable the OST in the MDS to make sure new files were not written to it?  Here is the document I was following: http://wiki.lustre.org/Handling_Full_OSTs

Jason Williams
Assistant Director
Systems and Data Center Operations.
Maryland Advanced Research Computing Center (MARCC)
Johns Hopkins University
jasonw at jhu.edu<mailto:jasonw at jhu.edu>

From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on behalf of Ahmed Fahmy <Ahmed.Fahmy at bibalex.org>
Sent: Tuesday, January 15, 2019 6:33:24 AM
To: lustre-discuss at lists.lustre.org
Cc: Supercomputer
Subject: [lustre-discuss] lfs_migrate issue

Good day,

I have been trying to migrate the data one of the OSTs in my lustre file system before removing the OST.

I have used the following command:

lfs find --obd lustre-OST0001_UUID /lustre | lfs_migrate -sy

I believe the data has been copied correctly.

However, when I check the size of the directories that has been participating in the migration process, I notice that the size has increased with a 3 or 4 GB increase, even after removing the OST.

I am not sure what is the reason for this issue and how I can return those directories to their original sizes.

I am using lustre 2.10.1.

Any help would be appreciated.


Ahmed Fahmy
Bibliotheca Alexandrina

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