disk-sleep problems

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Hi all,

I have two 2TB disks half set up using raid 1 (full mirroring ?) and the
other half using striping.

very frequently my system, a kubuntu 11.10, hangs (gui is unresponsive).
pressing alt-esc to popup the process monitor shows that key processes are
hanging on disk-sleep.

Often this is the flush daemon or the mdadm processes or sometimes just two
or three applications.

I have an i7 8GB disk with 64 bit linux.

What might be causing this ?
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