Bad 3ware 9000 performance 5.4?

[Vinod Kashyap]

> -----Original Message-----
> From: owner-freebsd-performance at freebsd.org
> [mailto:owner-freebsd-performance at freebsd.org]On Behalf Of 
> Alexis Yushin
> Sent: Thursday, May 19, 2005 8:14 PM
> To: freebsd-performance at freebsd.org
> Subject: Bad 3ware 9000 performance 5.4?
> 
> 
> Hi,
> 
> I've been browsing through the mailing list archive, but 
> could not find the
> answer/conclusion/solution to this...
> 
> Running FreeBSD 5.4... three machines with twe/3ware 8000 and 
> three twa/
> 3ware 9500-8 controllers. All of them running RAID 1+0 
> without write cache
> since we dont have battery backup unit. All of them Seagate 7200 SATA.
> 
> I get about 46Mb/s write on the 8000 series and only 5(!)MB/s 
> on the 9500 series.
> 
> How is this possible? Machines are in production so I can do 
> very little
> testing... Any ideas?
> 

You have to have write caching enabled to get better write performance.
If you see bad numbers even with caching enabled, check to see if
all drives/cables are ok.

> 
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