Tonight, October 14th 2015, around 10pm, I will be stopping all mail processing for a few moments while I move the servers to use a new spool on a newly upgraded server.

     The transfer of the servers to the new spool will take about ten minutes and then processing will resume.

     All of the shell servers will then need to be switched to the new mail spool.  Some will require a reboot.

     The end result of this is that the mail spool will no longer be on the same machine as home directories which will improve responsiveness by distributing the disk I/O load across multiple servers.

     In addition both the mail spool and the home directories will be on RAID 10 devices so any single disk failure will not interrupt service or cause loss of data.