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?
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
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