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List:       lustre-discuss
Subject:    [Lustre-discuss] mds backup question
From:       adilger () whamcloud ! com (Andreas Dilger)
Date:       2012-09-19 21:34:24
Message-ID: 9E1516C3-2A16-4394-860A-602BC85B23C0 () whamcloud ! com
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On 2012-09-19, at 9:36 PM, Jason Brooks wrote:
> Now that the getfattr operation is done, here are the specs:
> 
> the mds filesystem (mounted as type ldiskfs) has 7.7 gigabytes in use.
> 
> however, the getfattr operation produced an ascii file that is 20 gigabytes in \
> size. 
> is this reasonable?

Depends on what you are storing in xattrs and striping.  The MDS files have no data \
in them, so tar will only store the pathname and POSIX attributes.  The xattr data \
will have at least 96 bytes of data * 2 for asciification + any additional data you \
are storing for ACLs or user xattrs.

Cheers, Andreas

> On Sep 19, 2012, at 10:06 AM, Jason Brooks wrote:
> 
> > Hello,
> > 
> > I am running a file-level backup of an 1.8 mds system.  At the moment, I am \
> > running the getfattr command as mentioned on page 15-3 in the lustre fs manual.  \
> > The biggest thing i a noticing, is that the attributes are as large or larger \
> > than the actual filesystem.  I expect that when converting bits to ascii data, \
> > the amount of space used will increase.  The question though is "how much"?  It \
> > doesn't seem reasonable for the bits to inflate THAT much. 
> > --jason
> > 
> > 
> > Jason Brooks
> > 971-238-3924
> > brookjas at ohsu.edu
> > Oregon Health Sciences University
> > Center for Spoken Language Understanding
> > 
> > _______________________________________________
> > Lustre-discuss mailing list
> > Lustre-discuss at lists.lustre.org
> > http://lists.lustre.org/mailman/listinfo/lustre-discuss
> 
> Jason Brooks
> 971-238-3924
> brookjas at ohsu.edu
> Oregon Health Sciences University
> Center for Spoken Language Understanding
> 
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss


Cheers, Andreas
--
Andreas Dilger                       Whamcloud, Inc.
Principal Lustre Engineer            http://www.whamcloud.com/


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