Slow dir / Performance.

Slow dir / Performance.

[Stefan Bottelier | Sharper.nl]

Hello,

We have 2 Equallogic Systems, And a Dell Servers.

We have every server give a block device home dir , so the user data are 
on the home dir this is working great its format on xfs filesystem, and 
running iscsiadm version 2.0-870 with linux kernel 3.10.62

But when we logging on the server, the first time we do a dir command on 
the home dir, its take a long time when we get feedback on the dir , the 
next time is fast when we do a dir.
Now we have users on this systems and this problem give not good 
performance on sql and websites an e-mail we are running on the server.

Are the some information how i can fix ore maybe get this problem better 
under control ?

I hope so that somebody can help me, i am searching for more than 3 
weeks now.

Thanks,
Stefan

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Re: Slow dir / Performance.

[Emmanuel Florac]

Le Tue, 09 Dec 2014 09:26:10 +0100
"Stefan Bottelier | Sharper.nl" <stefan@sharper.nl> écrivait:

> But when we logging on the server, the first time we do a dir command
> on the home dir, its take a long time when we get feedback on the
> dir , the next time is fast when we do a dir.
> Now we have users on this systems and this problem give not good 
> performance on sql and websites an e-mail we are running on the
> server.
> 

I suspect that you're using slow, 7200 RPM drives in RAID-5 or RAID-6,
and you're IO bound. Equallogic arrays are notably slow. Easy to use,
cheap, and sloooow ("fast, good, cheap, choose two" as the saying go).

What is your drive/RAID configuration? Is the iSCSI link 1GigE or 10
GigE?

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Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |	<eflorac@intellique.com>
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Re: Slow dir / Performance.

[Stan Hoeppner]

On 12/09/2014 02:26 AM, Stefan Bottelier | Sharper.nl wrote:
> Hello,
> 
> We have 2 Equallogic Systems, And a Dell Servers.
> 
> We have every server give a block device home dir , so the user data are
> on the home dir this is working great its format on xfs filesystem, and
> running iscsiadm version 2.0-870 with linux kernel 3.10.62
> 
> But when we logging on the server, the first time we do a dir command on
> the home dir, its take a long time when we get feedback on the dir , the
> next time is fast when we do a dir.
> Now we have users on this systems and this problem give not good
> performance on sql and websites an e-mail we are running on the server.
> 
> Are the some information how i can fix ore maybe get this problem better
> under control ?

That's not enough information to diagnose the problem.  See:

http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F

Cheers,
Stan

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