In article <[EMAIL PROTECTED]> you wrote:
> Hello all,
> I have a 5G RAID1 device that I created under 2.2.16. The device is
> made of /dev/hda4 (Maxtor 102.G UDMA66) and /dev/hde4 (IBM 20.5G UDMA100).
> Under 2.2.16 'hdparm -t /dev/md0' gave read speeds of 22-26MB/sec on this
> combo. I've been running 2.4 series kernels for a while, and have noticed
> that access to the array takes a bit longer. 'hdparm -t /dev/md0' now tops
> out at 17MB/sec. Is this to be expected in the transition to 2.4, or did I
> mess something up?
(single threaded) RAID1 performance in 2.4 is limited to the speed of the
fastest disk[1]. Can you hdparm -t both your disks seperatly and post the
numbers here ?
Greetings,
Arjan van de Ven
[1] With a simple patch you can get it to the _sum_ of the throughput of the
disks, but that requires an on-disk format change.
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