Date: Tue, 20 May 2008 16:06:05 -0700 From: Xin LI <delphij@delphij.net> To: Andrew Snow <andrew@modulus.org> Cc: 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: <4833595D.1070409@delphij.net> In-Reply-To: <4833483B.4030208@modulus.org> References: <4832C397.3090004@calorieking.com> <4832E0EE.3030402@samsco.org> <4832E6C2.7040205@calorieking.com> <4833483B.4030208@modulus.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Andrew Snow wrote: | 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. I believe that data corruption can happen on every place if writing cache is lost, it's not an UFS-specific feature :) Cheers, - -- ** Help China's quake relief at http://www.redcross.org.cn/ |>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Xin LI <delphij@delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve! -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) iEYEARECAAYFAkgzWV0ACgkQi+vbBBjt66C31ACfQHkDuW7ahYNIjL652ALOm/S4 pZYAoJLWOkyhs1PBbrKpg36MqGFN8iE9 =csG8 -----END PGP SIGNATURE-----
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