[Gllug] RAID on laptop or xfs?

[Bruce Richardson]

On Thu, Mar 31, 2005 at 12:23:55PM +0100, Russell wrote:
> 
> Also note that it seems many hard drives (IDE ones in particular)
> perform write caching by default. If you lose power, anything stored in
> that cache gets lost, which means that XFS thinks stuff has been flushed
> to disk when it hasn't - the result? Massive corruption.

Almost all IDE and SATA drives and RAID controllers do this, to improve
performance.  It's why SATA RAID is never going to be as reliable as
SCSI RAID.  RAID5 on SATA is particularly vulnerable.

> 
> Even worse, some drives *IGNORE* a request to disable write caching!

And those that do honour it perform much worse when it's off.

-- 
Bruce

What would Edward Woodward do?
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