[Halld-offline] Hall D database server outage, Fri. March 22, 7:30 am

[Mark Ito]

Folks,

Our main offline database server, hallddb.jlab.org, will have a short 
outage on Friday morning, March 22, at 7:30 am. It is a virtual machine. 
The number of cores is being increased from 4 to 8. The memory is being 
expanded from 8 GB to 16 GB. This will hopefully help performance going 
forward, especially when many jobs start at the same time.

The server should be down for a few minutes.

Any farm job that *starts up* at this time and is using the MySQL 
interface to access CCDB or RCDB *will clearly encounter problems*. If 
the job has *gone past the point where it needs constants* from the 
database when 7:30 rolls around, it *should be ok* when the database 
server disappears. This has been tested, but not extensively. My 
judgment is that we live with a very few (if any) jobs having a problem 
rather than asking that all jobs be done before the upgrade occurs. 
Clearly if you are nervous about your jobs, do not run them during this 
time interval.

We will likely be doing more to enhance database server performance. 
This particular upgrade is easy to do, causes minimal disruption, and 
should help so we are doing it first.

   -- Mark


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