Date: Sun, 9 Apr 2000 14:25:31 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: "Kenneth D. Merry" <ken@kdm.org> Cc: Stephen Byan <Stephen.Byan@quantum.com>, freebsd-scsi@FreeBSD.ORG Subject: Re: newfs on IBM disks slower than Seagate disks? Message-ID: <Pine.BSF.4.21.0004091409470.491-100000@alphplex.bde.org> In-Reply-To: <20000407092955.A19590@panzer.kdm.org>
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On Fri, 7 Apr 2000, Kenneth D. Merry wrote: > On Fri, Apr 07, 2000 at 06:39:01 -0700, Stephen Byan wrote: > > Does the FreeBSD SCSI subsystem set the FUA bit in the CDB for UFS metadata > > writes? If so, then data integrity with WCE=1 is probably no worse than for > > WCE=0, since the filesystem is caching non-metadata writes anyway. > > ... > > CAM doesn't set the FUA bit on metadata writes because it doesn't currently > have a way to distinguish between metadata and normal data. The B_ASYNC flag gives an even more relevant distinction. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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