[CentOS] 3ware disk failure -> hang

Fri Jan 6 20:37:28 UTC 2006
Bryan J. Smith <thebs413 at earthlink.net>

Les Mikesell <lesmikesell at gmail.com> 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.

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.

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

Bryan J. Smith     Professional, Technical Annoyance                      b.j.smith at ieee.org      http://thebs413.blogspot.com
*** Speed doesn't kill, difference in speed does ***