3ware disk failure -> hang -- SCSI backplanes

[lesmikesell at gmail.com (Les Mikesell)]

On Fri, 2006-01-06 at 18:02, Bryan J. Smith wrote:

> > I have a non-critical IBM eserver with software raid
> > running so I yanked a drive to see what happens.
> 
> Hold on a second ...
> Are you using a SCSI backplane?
> If so, that's the difference right there!  ;->
> 
> SCSI backplanes and host adapters work very, very different
> on transient (or failure for that matter) than _any_ ATA or
> regular SCSI (without a backplane).
> They are still formulating similarly for SATA, and there are
> some SCSI adopted standards for SATA backplanes.
> But with SAS, much of that is becoming moot.
> 
> Okay, now things make far more sense.  ;->

The only relevant part of the backplane is that
it uses SCA connectors which you need for hot swapping
because they make the power and data connections happen
in the right order.  The controller doesn't know if
there is a backplane or just a cable.

-- 
  Les Mikesell
    lesmikesell@xxxxxxxxx