Date: 02 Jun 2003 10:29:47 +0200 From: Kern Sibbald <kern@sibbald.com> To: mjacob@feral.com Cc: freebsd-scsi@freebsd.org Subject: Re: SCSI tape data loss Message-ID: <1054542587.1578.1772.camel@rufus> In-Reply-To: <20030601165751.H97138@beppo> References: <1054490081.1582.1685.camel@rufus> <2846020000.1054498114@aslan.scsiguy.com> <1054503893.1578.1723.camel@rufus> <20030601165751.H97138@beppo>
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Yes, after a bit more thought, I realized this was the case, thanks. In any case, both buffered and async writes are turned off by default. On Mon, 2003-06-02 at 02:00, Matthew Jacob wrote: > 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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