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SubjectRe: PATCH: Update for the serial driver.
Date
Craig Rogers writes:
>
> >Note that being able to unload your primary disk driver is completely
> >useless.
>
> It might be useful to be able to update your primary disk
> driver on the fly, without rebooting. It might be useful to keep your
> system running while you switch from a failing drive to a good one.
>
> Impossible? Not if you have enough memory! Might take a
> little hackery at the VFS and block cache levels, though:
[snip]

Actually, with LVM it's not as impossible as it sounds. On AIX, and
presumably in future Linux LVM, you can have your filesystems mirrored
across different adapters, and even different kinds of disks (eg IDE,
SCSI, SSA, etc). You can already boot Linux LVM to have all of your
filesystems using LVM. If you were to "unmirror" from the boot device,
there might be nothing using that disk anymore, and you should be able to
safely remove and update the driver for this device... No fuss, no mess,
no need for extra code in the kernel...

Cheers, Andreas
--
Andreas Dilger University of Calgary \ "If a man ate a pound of pasta and
Micronet Research Group \ a pound of antipasto, would they
Dept of Electrical & Computer Engineering \ cancel out, leaving him still
http://www-mddsp.enel.ucalgary.ca/People/adilger/ hungry?" -- Dogbert

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