| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | "Mohan, Ross" <RMohan(at)arbinet(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: How to improve db performance with $7K? |
| Date: | 2005-04-19 16:10:22 |
| Message-ID: | 200504191610.j3JGAM820841@candle.pha.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
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?
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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