[Halld-offline] proposal: cache disk outage on Wednesday, July 24th

[Mark Ito]

Folks,

There will be a need for an interruption of our cache disk use to bring 
on new Lustre disk space (about a petabyte for all of Physics) and to 
upgrade Lustre software on the old system. All of the files already 
backed up to tape will disappear from cache; to access them they will 
have to be re-fetched from the tape library. Also new farm jobs will not 
start if they will run over the transition.

The proposed date is Wednesday, July 24th. The computer center has asked 
for feedback on the schedule. Let me know if you know of reasons why 
this is *not* a good time for the outage.

   -- Mark


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