RAID resync speed

[Eyal Lebedinsky]

I noticed that my 3-disk RAID was syncing at about 40MB/s, now that I
added a fourth disk it goes at only 20+MB/s. This is on an idle machine.

Individually, each disk measures 60+MB/s with hdparm.

kernel: 2.6.13 on ia32
Controller: Promise SATAII150 TX4
Disks: WD 320GB SATA

Q: Is this the way the raid code works? The way the disk-io is managed? Or
could it be due to the SATA controller?

-- 
Eyal Lebedinsky (eyal@xxxxxxxxxxxxxx) <http://samba.org/eyal/>
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