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Date: Fri, 6 May 2005 15:57:30 +0200
From: Herve Boulouis <amon@sockar.homeip.net>
To: Anton Turygin <pa3op@tsua.net>
Message-ID: <20050506135730.GC71715@ra.aabs>
References: <20050506130002.L13748@colt.tsua.net>
	<20050506121942.GB71715@ra.aabs> <20050506162412.G91866@colt.tsua.net>
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cc: freebsd-scsi@freebsd.org
Subject: Re: Adaptec 2120S FreeBSD 4.11 poor performance
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Le 06/05/2005  16:26, Anton Turygin a écrit:
> 
> Read Cache Setting        : ENABLE
> Write Cache Setting       : ENABLE ALWAYS
> Write Cache Status        : Active, not protected, battery not present
> 
> The array speed is up to 35 MB/s (it is still not enough).

this is typically the throughput you get with U160 drives. This
should go up to 70 MB/s with U320 drives (YMMV, but this is what
I usually get here with RAID 5 arrays of 3-5 disks). 

Also keep in mind that the 2120S is not a performance monster (the
2200S seems better on this point)
 
> The only thing - I didn't have succes in turning the Read Cache off.

You have to do all the changes in 1 command :

container set cache /read_cache_enable=false /unprotected=true 0

-- 
Herve Boulouis