Re: XFS corruption during power-blackout

[Sonny Rao <sonny@xxxxxxxxxxx>]

On Thu, Jun 30, 2005 at 11:46:27AM -0700, Chris Wedgwood wrote:
> On Thu, Jun 30, 2005 at 12:30:20PM -0400, Bryan Henderson wrote:
> 
> > For another point of reference - were these ATA (personal class) or
> > SCSI (commercial class) drives or both?
> 
> IDE were Maxtor some old Maxtor 60GB disks and some not-so-old 200GB
> WD drives.  Maxtor has 2MB cache.  WD 8MB.
> 
> The SCSI disks where 10K RPM SCA somethings.  I think they were Segate
> (they've since been taken or else I would check).  I have no idea what
> the cache is on those.
> 
> > Is write caching the default on typical SCSI devices?
> 
> I'm not sure.  It seemed to be off by default for the SCSI disks and
> on by default for IDE when I checked.  I can't rule out the
> bios/controller doing something there though.

On all the SCSI drives shipped w/ servers write-caching is turned off
for this very reason.  This is true of all the IBM equipment I've
seen, not sure about the smaller mom & pop outfits or drives sold
through retail channels though.

Sonny