Win SBS 2008 server running Exchange 2007 for about 25 users.
Dell T310 4*1Tb Raid 5, 8gb Ram
Was working fine until last night, suddenly stopped delivering mail. The mail is ending up in the exchange mail queue but not being delivered properly. Thought the mail DB was dead (thats the error msg in the Queued mails), bit it is still delivering mail very slowly. No backpressure, and no useful logs in the event viewer application section.
Checked the perf monitor for rpc requests, they start around 20 right after reboot and grow to over a hundred fairly quickly. No mail is being delivered at that point. After I reboot it delivers a few more messages until it locks up again. Disks look fine on the Dell server manager, no idea how it could go so wrong, so fast! Tried killing most non-essential services, but still not working. Tried to run exmon to see if the problem is with one of the clients rpc requests (I'm skeptical, we've been running fine for 5 years here!), but it only runs once per reboot, and also locks up after collecting 60 seconds worth of data, so its not that useful (:
Any ideas? I'm about out of them after 24 straight hours ...