From: Eric Sandeen <sandeen@sandeen.net>
To: Gim Leong Chin <chingimleong@yahoo.com.sg>
Cc: xfs@oss.sgi.com
Subject: Re: allocsize mount option
Date: Thu, 14 Jan 2010 11:42:11 -0600 [thread overview]
Message-ID: <4B4F5773.8050409@sandeen.net> (raw)
In-Reply-To: <264613.60659.qm@web76207.mail.sg1.yahoo.com>
Gim Leong Chin wrote:
> Hi Dave,
>
>
>> fragmented, it just means that that there are 19% more fragments
>> than the ideal. In 4TB of data with 1GB sized files, that would
>> mean there are 4800 extents (average length ~800MB, which is
>> excellent) instead of the perfect 4000 extents (@1GB each). Hence
>> you can see how misleading this "19% fragmentation" number can be
>> on an extent based filesystem...
>
> There are many files that are 128 GB.
>
> When I did the tests with dd on this computer, the 20 GB files had up
> to > 50 extents.
which is at least 400mb per extent, which is really not so bad.
-Eric
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next prev parent reply other threads:[~2010-01-14 17:41 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-14 17:25 allocsize mount option Gim Leong Chin
2010-01-14 17:42 ` Eric Sandeen [this message]
2010-01-14 23:28 ` Dave Chinner
-- strict thread matches above, loose matches on Subject: below --
2011-01-20 20:41 Peter Vajgel
2011-01-21 0:48 ` Dave Chinner
2010-09-28 18:53 Ivan.Novick
2010-09-29 0:31 ` Dave Chinner
2010-01-24 6:44 Gim Leong Chin
2010-01-15 3:08 Gim Leong Chin
2010-01-13 9:42 Gim Leong Chin
2010-01-13 10:50 ` Dave Chinner
2010-01-11 17:25 Gim Leong Chin
2010-01-11 18:16 ` Eric Sandeen
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