From owner-freebsd-scsi Sat Apr 8 21:26: 2 2000 Delivered-To: freebsd-scsi@freebsd.org Received: from gidora.zeta.org.au (gidora.zeta.org.au [203.26.10.25]) by hub.freebsd.org (Postfix) with SMTP id 1425B37B70D for ; Sat, 8 Apr 2000 21:25:56 -0700 (PDT) (envelope-from bde@zeta.org.au) Received: (qmail 15753 invoked from network); 9 Apr 2000 04:25:52 -0000 Received: from bde.zeta.org.au (203.2.228.102) by gidora.zeta.org.au with SMTP; 9 Apr 2000 04:25:52 -0000 Date: Sun, 9 Apr 2000 14:25:31 +1000 (EST) From: Bruce Evans X-Sender: bde@alphplex.bde.org To: "Kenneth D. Merry" Cc: Stephen Byan , freebsd-scsi@FreeBSD.ORG Subject: Re: newfs on IBM disks slower than Seagate disks? In-Reply-To: <20000407092955.A19590@panzer.kdm.org> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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