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<p>Folks,</p>
<p>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.<br>
</p>
<p>The server should be down for a few minutes.<br>
</p>
<p>Any farm job that <b>starts up</b> at this time and is using the
MySQL interface to access CCDB or RCDB <b>will clearly encounter
problems</b>. If the job has <b>gone past the point where it
needs constants</b> from the database when 7:30 rolls around, it
<b>should be ok</b> 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.</p>
<p>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.</p>
<p> -- Mark</p>
<p><br>
</p>
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