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Re: Some Performance Advice Needed

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Jeff <threshar(at)torgo(dot)978(dot)org>
Cc: Alex <alex(at)meerkatsoft(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Some Performance Advice Needed
Date: 2004-12-23 21:27:12
Message-ID: 41CB3830.2090201@commandprompt.com (view raw or flat)
Thread:
Lists: pgsql-performance
Jeff wrote:

>
> On Dec 23, 2004, at 9:27 AM, Alex wrote:
>
>
>> Running hdparm reported
>> A) 920mb/s   (SCSI 10k)
>> B) 270mb/s   (SCSI 10k)
>> C) 1750mb/s  (IDE  7.2k)
>
>
>
> IDE disks lie about write completion (This can be disabled on some 
> drives) whereas SCSI drives wait for the data to actually be written 
> before they report success.  It is quite
> easy to corrupt a PG (Or most any db really) on an IDE drive.  Check 
> the archives for more info.

Do we have any real info on this? Specifically which drives? Is SATA the 
same way? What about SATA-II?
I am not saying it isn't true (I know it is) but this is a blanket 
statement that may or may not be
true with newer tech.

Sincerely,

Joshua D. Drake




>
> -- 
> Jeff Trout <jeff(at)jefftrout(dot)com>
> http://www.jefftrout.com/
> http://www.stuarthamm.net/
>
>
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> TIP 4: Don't 'kill -9' the postmaster



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