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Re: Performances issues with SSD volume ? - Mailing list pgsql-admin

From Thomas SIMON
Subject Re: Performances issues with SSD volume ?
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Msg-id 5559EABB.1060405@neteven.com
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In response to Re: Performances issues with SSD volume ?  (Matheus de Oliveira <matioli.matheus@gmail.com>)
Responses Re: Performances issues with SSD volume ?
Re: Performances issues with SSD volume ?
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Hi matheus,
thanks for reply.

Kernel is slightly different ; with a 3.10.23-xxxx-std-ipv6-64 kernel (OVH kernel) on HDD server, and  3.2.65-1+deb7u1 kernel on SSD server.
I'm using debian wheezy on both servers.

I didn't changed the 2 parameters you talk about.

Thanks, 
Thomas
Le 18/05/2015 15:13, Matheus de Oliveira a écrit :

On Mon, May 18, 2015 at 10:05 AM, Thomas SIMON <tsimon@neteven.com> wrote:
After the change, I had the following behavior, and I don't understand why : everything seems to work fine (load is ~6/7, when it was previously ~25/30 on the HDD server), so the SSD server is faster than the HDD one, and my apps run faster too, but after some time (can be 5 minutes or 2 hours), the load average increases suddently (can reach 150 !) and does not decrease, so postgres and my application are almost unusable. (even small requests are in statement timeout)

Before we go mad, what is the OS/kernel/distro that you are using? Did it change from the previous one?

If Linux, have you disabled transparent_huge_pages and zone_reclaim_mode (two known problematic Linux features)?

Best regards,
--
Matheus de Oliveira
Analista de Banco de Dados
Dextra Sistemas - MPS.Br nível F!
www.dextra.com.br/postgres


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