[CentOS] 3ware disk failure -> hang

Fri Jan 6 20:47:53 UTC 2006
Les Mikesell <lesmikesell at gmail.com>

On Fri, 2006-01-06 at 14:37, Bryan J. Smith wrote:

> > That doesn't look like an md device error, it looks like
> > an IDE driver kernel error that never made it up to the
> > raid logic.
> Because you need some sort of hotplug or other logic to trap
> the error, instead of letting the storage device being
> reported as "removed" from the system.
> When you use 3Ware card as a "dumb" JBOD device, you lose
> _all_ of its features for hot-swap.  That's because it no
> longer hides the "raw" disk and its state from the system.

OK, but "raw" scsi disks don't have this problem.

> So when you use it in JBOD mode, and the volume = disk, you
> need to use _another_ facility to hide the "raw" disk status
> from the system.  That's where hotplug comes in, and you need
> to set it up proper.

Why is this different than a scsi drive?

> This has been a repeat theme.  People don't understand that
> all of the 3Ware "advantages" like hot-swap and hiding the
> "raw" disc status _only_ work when you use its hardware
> arrays.

Of course we don't understand it. Is this documented somewhere?

  Les Mikesell
   lesmikesell at gmail.com