Re: SATA RAID5 speed drop of 100 MB/s

On Sun, 24 Jun 2007 10:54:56 +1000, Eyal Lebedinsky wrote:

Jeff Garzik wrote:
[trim]

quoted

Given that some drives might be better tuned for benchmarks in
non-queued mode, and that a major behavior difference is that your
drives are now NCQ-enabled, the first thing I would suggest you try is
disabling NCQ:
    http://linux-ata.org/faq.html#ncq

I see in my bootup messages:
ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata6.00: ATA-7: WDC WD3200YS-01PGB0, 21.00M21, max UDMA/133
ata6.00: 625142448 sectors, multi 0: LBA48 NCQ (depth 0/1)
ata6.00: configured for UDMA/133

and I wonder how to interpret "NCQ (depth 0/1)". Does this drive
support NCQ or not?

Controller:	Promise SATA-II-150-TX4.
Kernel:		2.6.21.5, x86

Your drive does, but the driver for your controller does not (yet).

/Mikael