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Constant disk load with big amount of torrent


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i'm using following setup:

- 300B (25376) 2011-06-10 17:49:03 -0700

- CentOS release 6.3

- kernel: 2.6.32-279.11.1.el6.x86_64 #1 SMP Tue Oct 16 15:57:10


- storage: mdadm/raid6(6.9TB) + raid0 (2TB, as cache for active downloads)

- torrents(at the moment):

All - 202 (about 6TB),

active - about 43-50

- approximate traffic: about 7.3TB (upload - 5TB, download 2.3TB).

- uplink line: 1Gbps.

(more details can be found on my statistics page)

- RAM cache for utorrent - 3000-4000 megabytes.


1) average monthly upload is just 18 Mbps.

2) even when upload is less then 8 Mbps, I see constant read load on my storage RAID6 massive. And these values are not even comparable with current upload rates. E.g. if I have network upload rate - about 1 megaByte / sec, at the same moment I see about 55-60megaBytes of disk activity. Sometimes with peaks to 140-150megaBytes/second. If I stop utorrent, all this abnormal (from my point of view) disk activity stops. What is the reason for these reads? Precaching? Is it possible to reduce it somehow?

3) if I try to start wine+utorrent32, this strange disk activity disappears, but utorrent can't handle such amount of torrents (about 10-20 torrents become "broken" and rehashing of them does not help). Maximum size of cache - 1800. Maybe it's not enough.

4) if I restart utorrent, setting of cache memory is always reset to auto.

Hope for your help!

Thank you in advance for any useful ideas!

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