Re: How to improve db performance with $7K?

Clustered file systems is the first/best example that
comes to mind. Host A and Host B can both request from diskfarm, eg.



-----Original Message-----
From: Bruce Momjian [mailto:pgman@candle.pha.pa.us]
Sent: Tuesday, April 19, 2005 12:10 PM
To: Mohan, Ross
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] How to improve db performance with $7K?


Mohan, Ross wrote:
> The only part I am pretty sure about is that real-world experience
> shows SCSI is better for a mixed I/O environment.  Not sure why,
> exactly, but the command queueing obviously helps, and I am not sure
> what else does.
>
> ||  TCQ is the secret sauce, no doubt. I think NCQ (the SATA version
> || of per se drive request reordering)
>    should go a looong way (but not all the way) toward making SATA 'enterprise acceptable'. Multiple
>    initiators (e.g. more than one host being able to talk to a drive) is a biggie, too. AFAIK only SCSI
>    drives/controllers do that for now.

What is 'multiple initiators' used for in the real world?

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