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Re: Write cache

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: pgsql-hackers list <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Write cache
Date: 2004-01-28 00:40:24
Message-ID: 401704F8.5060906@dunslane.net (view raw or flat)
Thread:
Lists: pgsql-hackers

Tom Lane wrote:

>Andreas Pflug <pgadmin(at)pse-consulting(dot)de> writes:
>  
>
>>This would be the first time a SCSI disk lies about its write caching. 
>>There are plenty of low-cost (i.e. IDE) disks out there having a hidden 
>>write cache, but AFAIK a generic SCSI tool is usable to enable/disable 
>>the write cache.
>>    
>>
>
>A SCSI disk shouldn't lie about write completion in any case; there's no
>need to because the interface spec is inherently multi-threaded (unlike
>IDE).  See past discussions.
>
>  
>
Unless I am reading it wrong,

http://www.fcpa.com/download/download/hard-drives/map10krpm-manual.pdf 
appears to suggest (page 5-21) that the write cache can be disabled. How 
I am not sure - maybe using one of the tools Andreas mentioned.

cheers

andrew




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