Date: Mon, 10 Dec 2001 09:54:27 -0800 From: Mike Smith <msmith@freebsd.org> To: Terry Lambert <tlambert2@mindspring.com> Cc: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de>, freebsd-current@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern subr_diskmbr.c Message-ID: <200112101754.fBAHsRV01202@mass.dis.org> In-Reply-To: Your message of "Mon, 10 Dec 2001 06:10:30 PST." <3C14C256.549553DD@mindspring.com>
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> Joerg Wunsch wrote:
> > > I guarantee you that there are a number of controllers which have
> > > different ideas of how to do soft sector sparing _at the controller
> > > level_ rather than at the drive level.
> >
> > We have dropped support for ESDI controllers long since. :-)
> >
> > Seriously, all the disks we are supporting these days do bad block
> > replacement at the drive level.
>
> Adaptec 1742 is supported, though it took a long enough time to
> find its way into CAM. Same for the NCR 810.
Neither of which do controller-level sparing.
> For certain applications, also, you _want_ to turn off the automatic
> bad sector sparing: it's incompatible with spindle sync, for example,
> where you want to spare all drives or none, so that the spindles don't
> desyncronize on a sparing hit for one drive, but not another.
Spindle sync is an anachronism these days; asynchronous behaviour
(write-behind in particular) is all the rage. You'd be hard-pressed to
find drives that even support it anymore.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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