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Re: What's the best hardver for PostgreSQL 8.1?

From: Benjamin Arai <barai(at)cs(dot)ucr(dot)edu>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: What's the best hardver for PostgreSQL 8.1?
Date: 2005-12-26 09:22:09
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Lists: pgsql-performance
Have you done any benchmarking of the 9550SX against a software raid 

Luke Lonergan wrote:

>>  You definitely DO NOT want to do RAID 5 on a database server.  That
>>  is probably the worst setup you could have, I've seen it have lower
>>  performance than just a single hard disk. 
>I've seen that on RAID0 and RAID10 as well.
>This is more about the quality and modernity of the RAID controller than
>anything else at this point, although there are some theoretical
>advantages of RAID10 from a random seek standpoint even if the adapter
>CPU is infinitely fast at checksumming.  We're using RAID5 in practice
>for OLAP / Data Warehousing systems very successfully using the newest
>RAID cards from 3Ware (9550SX).
>Note that host-based SCSI raid cards from LSI, Adaptec, Intel, Dell, HP
>and others have proven to have worse performance than a single disk
>drive in many cases, whether for RAID0 or RAID5.  In most circumstances
>I've seen, people don't even notice until they write a message to a
>mailing list about "my query runs slowly on xxx dbms".  In many cases,
>after they run a simple sequential transfer rate test using dd, they see
>that their RAID controller is the culprit.
>Recently, I helped a company named DeepData to improve their dbms
>performance, which was a combination of moving them to software RAID50
>on Linux and getting them onto Bizgres.  The disk subsystem sped up on
>the same hardware (minus the HW RAID card) by over a factor of 10.  The
>downside is that SW RAID is a pain in the neck for management - you have
>to shut down the Linux host when a disk fails to replace it.
>- Luke
>---------------------------(end of broadcast)---------------------------
>TIP 6: explain analyze is your friend

*Benjamin Arai*
barai(at)cs(dot)ucr(dot)edu <emailto:barai(at)cs(dot)ucr(dot)edu>

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