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List:       lustre-discuss
Subject:    Re: [lustre-discuss] Full OST, any way of avoiding it without hanging?
From:       "Harr, Cameron" <harr1 () llnl ! gov>
Date:       2019-01-08 0:24:34
Message-ID: cc66df60-53e9-a723-4e63-a7a9dfd98a24 () llnl ! gov
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In my brief attempts to use lfs migrate, I found performance pretty slow =

(it's serial). I also got some ASSERTs which should be fixed in 2.10 per =

LU-8807; note that I was using 2.8. On a more trivial level, I found the =

-v|--verbose option to the command doesn't work.


On 01/07/2019 12:26 PM, Mohr Jr, Richard Frank (Rick Mohr) wrote:
>> On Jan 7, 2019, at 2:09 PM, Jason Williams <jasonw@jhu.edu> wrote:
>>
>> One last question, How safe is lfs_migrate?  The man page on the install=
ation says it's UNSAFE for possibly in-use files.  The lustre manual doesn'=
t have the same warning and says something about it being a bit more integr=
ated with the MDS.
>>
>> http://doc.lustre.org/lustre_manual.xhtml#dbdoclet.lfs_migrate
> I have not used lfs_migrate, so I don=92t have any direct experience.  Fr=
om what I have read online, the lfs_migrate script used to just do a copy/r=
ename of the file.  But now it looks like the =93lfs=94 command has a built=
-in =93lfs migrate=94 subcommand which supports a =93=97block=94 option to =
prevent file access while the migration is happening.  So it might be safe =
to use.
>
> Perhaps someone else on the list with more experience using this command =
could chime in.
>
> --
> Rick Mohr
> Senior HPC System Administrator
> National Institute for Computational Sciences
> http://www.nics.tennessee.edu
>
> _______________________________________________
> lustre-discuss mailing list
> lustre-discuss@lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org

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