Question : Exchange 2003 - Store disk activity

I have a Server 2003 (Enterprise) running Exchange 2003 (Standard) that is having disk utilization issues, basically my drives containg the stores are running 100% utilization.  This server has been up and running for 4 months without issue, the utilization problem began last week, no changes have been made to the server prior to the problem.

Logical Drive 0 is a mirrored set with 2 partions:
C: OS - Only
D: Applications, Exchange and Log files

Logical Drive 1 is a Raid 5 set with 3 active and 1 spare drive:
E: Exchange Store's - currently only two, private and public (less then 8gb total)

Exchange has been configured to run RPC over http.  Server is running, IIS (OWA), Exchange, DNS, AD.  Since I am running RPC over HTTP, the server has also been configured as a GC, it is not the only GC in my domain.  I have roughly 75 users on the exchange box, the majority of these user are using POP, maybe 10 of them are exchange clients with 3 running the RPC over HTTP using Outlook 2003.

The server did have GFI Mail Security running on it - this was removed in troubleshooting this problem.
The server was running Symantec Anti-Virus - this was removed in troubleshooting this problem.
Nothing else is running on the server.
Hardware wise it a Compaq ML350, Dual 2.2ghz with hyperthreading, 2gb ram, hardware based Raid.

Since the problem has occured, I have removed Symantec, Defraged the store, removed GFI - none of this has helped.  My queues do not appear to be backing up.  I am having issues with POP clients timing out, exchange clients receiving messages that the server is unavailable, my RPC Averaged Latency appears to be high (currently 62), my disk queue is outragious.

I'm sure I am missing the obvious however I'm at a loss - any help would be greatly appreciated.

Answer : Exchange 2003 - Store disk activity

PAQed, with points refunded (500)

modulo
Community Support Moderator