linux-ext4 - Slow filesystem.

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Date:	Fri, 13 May 2011 14:59:58 +0200
From:	Rogier Wolff <R.E.Wolff@...Wizard.nl>
To:	linux-ext4@...r.kernel.org
Subject: Slow filesystem. 

Hi

My work (as in what brings in money to buy things from) file-system is
now "slow as hell". Last time this happened you guys told me that this
was because I had millions of hardlinks and way too many files.

Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/md0                815M    4.1M    811M    1% /recover2

I have only 4.1M files. Only 1% inodes "in use". 

The filesystem was filling up lately, but i've managed to create some
free space.

Filesystem            Size  Used Avail Use% Mounted on
/dev/md0              6.3T  5.3T  720G  89% /recover2

 The question is: How do I get the filesystem to perform
normally again?

All mkdir calls are taking around 62 milliseconds: 

14:57:02 mkdir("...ME_25c8e/", 0777) = 0 <0.062312>
14:57:02 mkdir("...ME_112ff/", 0777) = 0 <0.062658>
14:57:02 mkdir("...ME_183cf/", 0777) = 0 <0.062344>

while on my workstation where i'm not supposed to be working
with client-data I get: 

14:58:18 mkdir("...ME_2a6c6/", 0777) = 0 <0.000033>
14:58:18 mkdir("...ME_2b3d9/", 0777) = 0 <0.000031>
14:58:18 mkdir("...ME_2c63f/", 0777) = 0 <0.000034>

So, things on my big datastorage drive are about 2000 times slower
than on my workstation.

	Roger. 

-- 
** R.E.Wolff@...Wizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 **
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