From: Ogden <lists@darkstatic.com>
To: Gary Doades <gpd@gpdnet.co.uk>
Cc: pgsql-performance@postgresql.org
Subject: Re: Raid 5 vs Raid 10 Benchmarks Using bonnie++
Date: Wed, 17 Aug 2011 13:56:17 -0500
Message-ID: <AE7D7AD5-0948-438E-BA75-E12A8EB44446@darkstatic.com> (raw)
In-Reply-To: <4E4C0969.5030401@gpdnet.co.uk>
References: <959BD2FA-0312-458B-BD5F-ED358D2C47ED@darkstatic.com>
<f4e06a7cad34ee9217a3e57fd4eb0e67.squirrel@sq.gransy.com>
<D89151D3-D2E5-47E3-8B90-4A573DAB5FFA@darkstatic.com>
<75A85649-2B95-43D5-8404-4776D2E580EC@darkstatic.com>
<4E4C0969.5030401@gpdnet.co.uk>
On Aug 17, 2011, at 1:33 PM, Gary Doades wrote:
> On 17/08/2011 7:26 PM, Ogden wrote:
>> I am using bonnie++ to benchmark our current Postgres system (on RAID 5) with the new one we have, which I have configured with RAID 10. The drives are the same (SAS 15K). I tried the new system with ext3 and then XFS but the results seem really outrageous as compared to the current system, or am I reading things wrong?
>>
>> The benchmark results are here:
>>
>> http://malekkoheavyindustry.com/benchmark.html
>>
> The results are not completely outrageous, however you don't say what drives, how many and what RAID controller you have in the current and new systems. You might expect that performance from 10/12 disks in RAID 10 with a good controller. I would say that your current system is outrageous in that is is so slow!
>
> Cheers,
> Gary.
Yes, under heavy writes the load would shoot right up which is what caused us to look at upgrading. If it is the RAID 5, it is mind boggling that it could be that much of a difference. I expected a difference, now that much.
The new system has 6 drives, 300Gb 15K SAS and I've put them into a RAID 10 configuration. The current system is ext3 with RAID 5 over 4 disks on a Perc/5i controller which has half the write cache as the new one (256 Mb vs 512Mb).
Ogden
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: lists@darkstatic.com, gpd@gpdnet.co.uk
Subject: Re: Raid 5 vs Raid 10 Benchmarks Using bonnie++
In-Reply-To: <AE7D7AD5-0948-438E-BA75-E12A8EB44446@darkstatic.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox