Simple server issues - novice

I purchased a Mac Mini (1.1) on ebay with OS X server to use primarily as a file server in a home environment, primarily for music, video and iPhoto files. The server is also running Squeezebox in the background. Probably overkill for my needs, but certainly should be functional. To maximize speed, I modified the mini by attaching a cable to the internal sata port (in place of the HD) and hooking to an external 1.5 TB eSATA drive (enclosed in a Rosewill RX81-MP-SC- SLV). Icreated two partitions on the external drive, one with the system files and one with the data to be shared. I also have a second 1.5 TB drive connected via the FW400 port on the mini.

The system is configured and seems to run fine for awhile, then it crashes. The clients that are mounted lose the shared partition from the server. Attempts to access other files on the server fail (although generally the server can still be seen from the finder). Looking at the server itself, the screen is frozen and the mini needs to be rebooted. I am not sure what has happened, nor what the cause is. It seems that 36-72 hours go by without incident, then I crash.

I have now swapped the two external disks. I have the startup volume (the 2 partition disk) connected FW400 and the other disk connected eSATA. This is not ideal (defeats my reason for going SATA in the first place) but I have not crashed for 12 hours now. Time will tell if making the start-up SATA is a problem (my drive enclosure uses the Oxford 934 chipset).

Only other information I can give is from the logs on the server. It is clear that some things are going on that should not be, but I doubt those are the issue:

FROM BEFORE CRASH
1/26/10 11:50:00 PM com.apple.emailrules.nightly[8095] /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/zope / _init_.py:1: UserWarning: Module twisted was already imported from /usr/share/caldavd/lib/python/twisted/ _init_.pyc, but /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python is being added to sys.path
1/26/10 11:50:00 PM com.apple.emailrules.nightly[8095] _import__('pkg_resources').declare_namespace(__name_)
1/26/10 11:50:01 PM com.apple.emailrules.nightly[8095] /usr/share/caldavd/lib/python/twisted/mail/smtp.py:10: DeprecationWarning: the MimeWriter module is deprecated; use the email package instead
1/26/10 11:50:01 PM com.apple.emailrules.nightly[8095] import MimeWriter, tempfile, rfc822
1/27/10 2:15:00 AM com.apple.learnjunkmail[10111] Can't find GUID for junk mail user junkmail
1/27/10 2:15:00 AM com.apple.learnjunkmail[10111] No GUID found for: junkmail
1/27/10 2:15:00 AM com.apple.launchd[1] (com.apple.learnjunkmail[10111]) Exited with exit code: 1
1/27/10 2:30:01 AM com.apple.launchd[1] (com.apple.updatesa[10321]) Exited with exit code: 1
1/27/10 3:15:00 AM com.apple.launchd[1] (com.apple.wikid.logcompressor[10945]) posix_spawn("/usr/bin/logcompressor.sh", ...): No such file or directory
1/27/10 3:15:00 AM com.apple.launchd[1] (com.apple.wikid.logcompressor[10945]) Exited with exit code: 1
1/27/10 5:00:01 AM ServerScanner[12472] Preference says we shouldn't scan
1/27/10 9:09:58 AM com.apple.launchd[1] (com.apple.suhelperd[15915]) Exited with exit code: 2


POST LAST CRASH BUT SHOULD NOT BE HAPPENING (I dont think)
1/28/10 8:00:55 PM Server Preferences[3140] -beginGrouping and -endGrouping are still no-ops
1/28/10 8:00:57 PM Server Preferences[3140] Could not find a valid Time Machine backups share point (afpName LIKE Backups)
1/28/10 8:00:58 PM Server Preferences[3140] Could not find a valid Time Machine backups share point (afpName LIKE Backups)
1/28/10 8:00:58 PM Server Preferences[3140] XSActionManager: Removing queued action (Reading permissions) due to coalescing (readSettings path/Volumes/Shared TV)
1/28/10 8:00:58 PM Server Preferences[3140] XSActionManager: Removing queued action (Reading permissions) due to coalescing (readSettings path/Volumes/Shared Music)
1/28/10 8:01:18 PM Server Preferences[3140] Could not find a valid Time Machine backups share point (afpName LIKE Backups)
1/28/10 11:50:00 PM com.apple.emailrules.nightly[6454] /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/zope / _init_.py:1: UserWarning: Module twisted was already imported from /usr/share/caldavd/lib/python/twisted/ _init_.pyc, but /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python is being added to sys.path
1/28/10 11:50:00 PM com.apple.emailrules.nightly[6454] _import__('pkg_resources').declare_namespace(__name_)
1/28/10 11:50:00 PM com.apple.emailrules.nightly[6454] /usr/share/caldavd/lib/python/twisted/mail/smtp.py:10: DeprecationWarning: the MimeWriter module is deprecated; use the email package instead
1/28/10 11:50:00 PM com.apple.emailrules.nightly[6454] import MimeWriter, tempfile, rfc822
1/29/10 2:15:00 AM com.apple.learnjunkmail[8459] Can't find GUID for junk mail user junkmail
1/29/10 2:15:00 AM com.apple.learnjunkmail[8459] No GUID found for: junkmail
1/29/10 2:15:00 AM com.apple.launchd[1] (com.apple.learnjunkmail[8459]) Exited with exit code: 1
1/29/10 2:30:01 AM com.apple.launchd[1] (com.apple.updatesa[8674]) Exited with exit code: 1
1/29/10 3:15:00 AM com.apple.launchd[1] (com.apple.wikid.logcompressor[9295]) posix_spawn("/usr/bin/logcompressor.sh", ...): No such file or directory
1/29/10 3:15:00 AM com.apple.launchd[1] (com.apple.wikid.logcompressor[9295]) Exited with exit code: 1
1/29/10 5:01:00 AM ServerScanner[10841] Preference says we shouldn't scan
1/29/10 5:25:26 AM com.apple.launchd[1] (com.apple.suhelperd[11180]) Exited with exit code: 2