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

[Mark Ito]

Reminder: hallddb will have a service interruption tomorrow morning.

On 3/20/19 4:34 PM, Mark Ito wrote:
>
> 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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