Einstein

General Information

Einstein is the primary server, and hosts services for LDAP, NFS for home directories, E-mail, Elog.

Hostnames: einstein.unh.edu, einstein.farm.physics.unh.edu

Hardware Information

• Motherboard: SuperMicro H8SMU
  • nVidia MCP55-Pro chipset
  • Interesting thread to get sata-nv to hotswap: ([1])
  • There are drivers available for the MB sata, we could try them: Super Micro MB H8SMU drivers, BUT these appear to be standard Nvidia sata_nv driver.
• SAS Backplane: SAS825TQ
• SAT2-MV8 8-port SATA controller. Uses the sata-mv module which is NOT HOTPLUG CAPABLE. (see http://linux-ata.org/driver-status.html#matrix). THE ONLY WAY TO "HOT PLUG" with this driver is to dismount ALL the drives, then "modprobe -r sata-mv" (make sure it is really gone: lsmod | grep sata) then do the swap, then "modeprobe sata-mv" again.

Network Configuration

Currently has ethernet cable to switch for local (farm) connection, and an ethernet cable to the wall for unh connection.

Hardware Information

• Motherboard: SuperMicro H8SMU
  • nVidia MCP55-Pro chipset
  • Interesting thread to get sata-nv to hotswap: ([2])
  • There are drivers available for the MB sata, we could try them: Super Micro MB H8SMU drivers, BUT these appear to be standard Nvidia sata_nv driver.
• SAS Backplane: SAS825TQ
• SAT2-MV8 8-port SATA controller. Uses the sata-mv module which is NOT HOTPLUG CAPABLE. (see http://linux-ata.org/driver-status.html#matrix). THE ONLY WAY TO "HOT PLUG" with this driver is to dismount ALL the drives, then "modprobe -r sata-mv" (make sure it is really gone: lsmod | grep sata) then do the swap, then "modeprobe sata-mv" again.

Special Considerations for Einstein (Historical)

This information no longer applies and is here for historical reasons. We no longer use amavisd, and so these instructions are not useful.

Einstein is our mail server. That means it runs "amavisd" (a virus scanner) and "spamassasin" a spam filter. Both these codes have some issues with leaving junk around, slowly causing the "/" file system to fill up. When that happens, einstein stops functioning.

Some cleanup can be done as follows:

• stop amavisd and spamassasin:

service amavisd stop
service spamassasin stop

• clean out some of their junk:

rm /var/amavis/.razor/razor-agent.log 
touch /var/amavis/.razor/razor-agent.log 
chown amavis:amavis /var/amavis/.razor/razor-agent.log
chmod o-r /var/amavis/.razor/razor-agent.log
rm -f /var/virusmails/*   # (Sometimes there are so many, you have to delete in "chunks")
rm -rf /tmp

• start up the mail stuff again.

service amavisd start
service spamassasin start

There may be other areas that can be clean up, as in all the archived mail from "mailman"? But at least this list will let einstein function again.