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IDE x SAS RAID 0 on HP DL 380 G5 P400i controller performance problem

From: Daniel Ferreira de Lima <dfl(dot)man(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: IDE x SAS RAID 0 on HP DL 380 G5 P400i controller performance problem
Date: 2010-07-19 12:24:01
Message-ID: AANLkTimtyqefnmOF6xEihmoSjD333yGuYXRQ4PyVXe6j@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
Hi people,

I have a particular performance problem under a system installed.

In the lab I have an old Microside + Dual Core machine 1GB RAM with 40gb HD
IDE and
a newer machine HP DL 380 G5 4GB RAM and 500GB SAS under RAID 0 (4 disks)
P400i Smart Array Controller.

**Both with Linux Kernel 2 .4.37.9 and Postgresql 7.2**

Under a insertion test we get a performance of 2.5 secs under 2000 inserts
(table with a single char(50) column) in the IDE disk.
And 500GB RAID 0 (4 disks!) and 37.5 secs under the same test!

I tried:
- All the postgresql.conf tuning possibles
- All the kernel tuning values possibles
- fstab mount options
- limits.conf values
- I/O tests with boonie++ that shows that P400 is superior than IDE - as
expected
- 'massive' Google search combinations without answers
- Mandriva 2009.1: result is about 12 secs (but it need to be kernel 2.4
with PGSQL 7.2)


The real case:
~100k database insertions that runs in 2 min in the IDE, against ~40 minutes
(P400i) in the HP.

The same test in the HP Blade G5 P200 controller works fine.

Thanks for any answers/analisys.

Best regards.

-- 
Daniel Ferreira

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Next:From: Kevin GrittnerDate: 2010-07-19 13:28:03
Subject: Re: IDE x SAS RAID 0 on HP DL 380 G5 P400i controller performance problem
Previous:From: kuopoDate: 2010-07-19 06:27:51
Subject: how to handle a big table for data log

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