Re: SCSI vs SATA - Mailing list pgsql-performance

From Stefan Kaltenbrunner
Subject Re: SCSI vs SATA
Date
Msg-id 4613CB60.6030505@kaltenbrunner.cc
Whole thread Raw
In response to Re: SCSI vs SATA  ("Joshua D. Drake" <jd@commandprompt.com>)
Responses Can't drop tablespace or user after disk gone  ("Craig A. James" <cjames@modgraph-usa.com>)
List pgsql-performance
Joshua D. Drake wrote:
>
>>> SATAII brute forces itself through some of its performance, for
>>> example 16MB write cache on each drive.
>>
>> sure but for any serious usage one either wants to disable that
>> cache(and rely on tagged command queuing or how that is called in SATAII
>
> Why? Assuming we have a BBU, why would you turn off the cache?

the BBU is usually only protecting the memory of the (hardware) raid
controller not the one in the drive ...


Stefan

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