cluster daemons, formatting partions and unexpected reboot

hi, i've two HP Proliant DL370 G3 connected via scsi to an Smart Array Storage 500.

The great problem: when both proliant are member of the cluster and i try to format a partions (local or on the storage, same thing) the server will reboot! no log, no error, no dump file or kernel exceptions. the hardware seems to be ok. i've installed the last kernel (e-37) and the last clumanager package but the problems still persist!

if i disable the cluster daemons (service cluster stop) on a server, i am able to format partions (both local or on the storage) and all appeared to be ok.

what can be?

i've tested the cluster failover functionality and all is ok.

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