Date: Sun, 1 Jun 2003 17:00:18 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Kern Sibbald <kern@sibbald.com> Cc: freebsd-scsi@freebsd.org Subject: Re: SCSI tape data loss Message-ID: <20030601165751.H97138@beppo> In-Reply-To: <1054503893.1578.1723.camel@rufus> References: <1054490081.1582.1685.camel@rufus> <2846020000.1054498114@aslan.scsiguy.com> <1054503893.1578.1723.camel@rufus>
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Of course linux has async && buffered. Linux has to copy the data from user space to kernel buffers and *then* write them. This leads to an obvious desire to overlap such writes. The same feature was available in Solaris 2.5 as well. 'Buffering' as we talk about here typically means the device buffers themselves. You don't want to turn this off. You don't want to turn this off. You don't want to turn this off. The only device that I know of that really *has* to have this off is the old M4 1/2" reel drive because it would discard buffered data when it saw the early warning marker. I have a longer answer to the previous mail about to go out. -matt
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