[Gllug] Re: RAID on laptop or xfs?

[Russell Howe]

On Mon, Apr 04, 2005 at 12:53:12PM +0100, Christian Smith wrote:
> Where SCSI gets it right in this regard, and IDE may be catching up, is
> tagged command queueing. This way, the SCSI drive can reorder writes to
> optimize performance, but will only notify the successful write when it is
> done, without holding up the initiation of further writes. The OS can use
> the tagged commands to implement correct ordering.

Unfortunately, TCQ is still a bit of a mess, at least in the SATA
world, and the new ATA layer for Linux, libata, doesn't support it
yet anyway.

http://linux.yyz.us/sata/software-status.html#tcq

http://linux.yyz.us/sata/sata-status.html#hw_support

-- 
Russell Howe       | Why be just another cog in the machine,
rhowe at siksai.co.uk | when you can be the spanner in the works?
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