Date: Wed, 21 May 2008 09:33:41 +1000 From: Andrew Snow <andrew@modulus.org> To: freebsd-scsi@freebsd.org Cc: d@delphij.net Subject: Re: Very poor performance from Dell/LSI Logic SAS 3000 series SATA/SAS RAID controller FreeBSD 6.3 Message-ID: <48335FD5.3000800@modulus.org> In-Reply-To: <4833595D.1070409@delphij.net> References: <4832C397.3090004@calorieking.com> <4832E0EE.3030402@samsco.org> <4832E6C2.7040205@calorieking.com> <4833483B.4030208@modulus.org> <4833595D.1070409@delphij.net>
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Xin LI wrote: > I believe that data corruption can happen on every place if writing > cache is lost, it's not an UFS-specific feature :) ZFS has the promise of not requirring safe hardware write-caches due to its parity data and intent log. From my understanding, it can promise that a data block has been written completely and safely, and that filesystem metadata is not corrupted, but out-of-order writes could still happen. - Andrew
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