Date: Wed, 21 May 2008 07:52:59 +1000 From: Andrew Snow <andrew@modulus.org> To: freebsd-scsi@freebsd.org Subject: Re: Very poor performance from Dell/LSI Logic SAS 3000 series SATA/SAS RAID controller FreeBSD 6.3 Message-ID: <4833483B.4030208@modulus.org> In-Reply-To: <4832E6C2.7040205@calorieking.com> References: <4832C397.3090004@calorieking.com> <4832E0EE.3030402@samsco.org> <4832E6C2.7040205@calorieking.com>
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Warren Guy wrote: > Thanks a lot for that. This seems to have alleviated the problem, I'm seeing > decent performance now in my limited benchmark. It seems quite odd to me that > the write cache is not enabled by default, but oh well. Technically with UFS, it can lead to filesystem or database corruption - when the power goes off suddenly, the OS+controller thinks the data has been written, but the drive has it in cache that is not battery-backed.
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