Plesk performance on Debian vs CentOS

[AbdallahA]

Hi all,

Recently (a month ago) we switched our OVH servers from CentOS to Debian 5, Plesk 9.3 was running with no problems at all, and with a very good speed, once we switched our Plesk server to be debian 5 based, problems started, Plesk is very slow now, then i changed the grsec kernel with a standard one, things went better, but still relatively slow.

I know that debian 5 support was added with Plesk 9.3, if anybody else is having this performance issue on debian 5, and what is the reason for it.

Thanks.

 

[IgorG]

Strange. I never heard about this performance difference and it is very interesting if someone report the same problem here.

 

[AbdallahA]

One thing is probably important to mention, we are running php 5.2 and php 5.3 on this debian 5 server, i don't think this will make Plesk slow, but okay...

Do you think it worth trying to disable selinux? i was told by my supervisor to put back CentOS for this Plesk server, i dislike this kind of solutions, specially because when changing the OS there is always risk to loose data.

 

[AbdallahA]

Okay, it turns out that it is nothing to do with Plesk, the problem is in the HDD driver, the hard disk is running between 400kb/s to 2MB/s, while it should be around 50MB/s.

 

[IgorG]

Try to improve HDD performance with hdparm utility.

 

[AbdallahA]

Try to improve HDD performance with hdparm utility.

We already tried all the possibilities with hdparm, any settings was failing, the problem is in libata for debian 5.