disabling soft updates

[Robert Fitzpatrick]

I have a Supermicro server with an Adaptec 2020SA RAID card and RAID10 
setup. This server is mainly used as an NFS host for  VMware data 
storage of VM's. I have been having the following issue locking up the 
server....

aacd0: COMMAND 0xffffffff808599e0 TIMEOUT AFTER XXXX SECONDS

I reboot, clean the partitions in single user mode and all comes back up 
fine. After some searching, I found that it could be the card or perhaps 
I should disable soft updates using tunefs. I verified the partitions do 
have soft updates enabled except for the root partition. There is one 
/data partition that serves the VM's to VMware and it has soft updates 
enabled as well as the /usr and /var partitions. Does anyone have any 
experience with doing this or whether disabling soft updates on one or 
more of these partitions is a good idea, what effects it would have for 
this type of usage for the server?

Also, if I replace the RAID card, does anyone know if the RAID is lost 
when doing so or it should recognize the existing RAID setup?

Thanks
-- 
Robert