[kwlug-disc] MDADM and RAID

Chris Irwin chris at chrisirwin.ca
Wed Mar 3 21:01:45 EST 2010


On Wed, 2010-03-03 at 20:55 -0500, John Van Ostrand wrote:
> ----- "Chris Irwin" <chris at chrisirwin.ca> wrote:
> 
> > I almost went as far as saying "Either disk cache matters or Hitachi
> > sucks", but then I remembered I had to flash the firmware on the
> > Seagates to prevent them from bricking themselves, so I'm just not
> > having the best time in picking quality drives.
> 
> I'm curious, do both drives support NCQ? Check dmesg | grep ata and look for NCQ.

Yes they do.

$ dmesg | grep NCQ
[    1.450844] ata1.00: 976773168 sectors, multi 16: LBA48 NCQ (depth
31/32)
[    1.450875] ata3.00: 976773168 sectors, multi 16: LBA48 NCQ (depth
31/32)
[    1.451515] ata2.00: 976773168 sectors, multi 16: LBA48 NCQ (depth
31/32)
[    1.451553] ata4.00: 976773168 sectors, multi 16: LBA48 NCQ (depth
31/32)
$ cat /sys/block/sda/device/queue_depth
31

-- 
Chris Irwin
e:  chris at chrisirwin.ca
w: http://chrisirwin.ca
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