2 question about XFS fragmentation and _fsr: SPLITTED Q2:normal files, samba share

[Janos Haar]

Note: I have splitted my previous letter for easyer discusion...
This have only Question-2 the storage with only normal files and samba 
share.

----- Original Message ----- 
From: "Stan Hoeppner" <stan at hardwarefreak.com>
To: "Janos Haar" <janos.haar at netcenter.hu>
Cc: <linux-xfs at oss.sgi.com>
Sent: Monday, April 11, 2011 10:37 PM
Subject: Re: 2 question about XFS fragmentation and _fsr


> Janos Haar put forth on 4/11/2011 12:39 PM:
>> Question 2:
>> One of our customers have one storage wich is exactly the same like the
>> one wich is described on the Q1, but only used for samba storage for
>> storing media files (big files.)
>
> Writing large files sequentially shouldn't cause fragmentation.
>
>> I am sure, there is no torrent or similar, and i have told to the
>> customers on the beginning "don't write more files parallel, to avoid
>> fragmentation", but today the storage is >95% fragmented.
>> The customer sad, he only does file write one by one, and nothing more.
>> How can this be?
>
> What were the mkfs.xfs arguments you used when creating these
> filesystem?  Please share xfs_info output for the filesystems in
> question, and details of the underlying hardware RAID storage.

This was the default.

 xfs_info /dev/loop0
meta-data=/dev/loop0             isize=256    agcount=32, agsize=114269833 
blks
         =                       sectsz=512   attr=0
data     =                       bsize=4096   blocks=3656634656, imaxpct=25
         =                       sunit=0      swidth=0 blks, unwritten=1
naming   =version 2              bsize=4096
log      =internal               bsize=4096   blocks=32768, version=1
         =                       sectsz=512   sunit=0 blks
realtime =none                   extsz=65536  blocks=0, rtextents=0

>
> -- 
> Stan

Thanks,
Janos