Re: Upcoming DOWNTIMES for NIH Biowulf (Biowulf)

As announced previously, the second phase of the Biowulf
Continuous Power Project will commence on Wednesday, 27
July at 6 pm.  This stage of the maintenance will affect
all "e2666:c8:g24" and "e2666:c8:g72" nodes only.

Beginning this afternoon, 26 July 2011, the aforementioned
nodes will be set offline which means currently running jobs
will continue to run, but those nodes will accept no further
new jobs.

Late Wednesday afternoon, 27 July 2011, one half of those
nodes will be powered down.  Any jobs still running on
those nodes at that time will be deleted.  These nodes
should be back online by no later than Thursday morning.

Late Thursday afternoon, 28 July 2011, the other half of
those nodes will be powered down.  Any jobs still running
on those nodes at that time will be deleted.  These nodes
should be back online by no later than Friday morning.

Jobs not running on these nodes will not be affected.  Queued
jobs will not be affected.  The Biowulf login node and user
/home and /data directories will remain available.



On Wed, 20110713 14:32, steven fellini wrote:
> During the next several weeks the NIH Data Center which houses the
> Biowulf Cluster will be transitioning to a new Continuous Power
> System.  This system will provide significantly more and reliable
> power than is currently available.
> 
> However the transition will result in numerous disruptions to the
> operation of the Biowulf compute nodes.  The expected partial and
> total downtimes are as follows:
> 
> -- Tonight, as previously announced, half of the "e2666:c8:g24"
>    nodes will briefly be powered down.
> 
> -- On the evening of July 27/28, ALL "e2666:c8:g24,g72" nodes will
>    briefly be powered down.  
> 
> -- During the day on August 6, ALL compute nodes will briefly be
>    powered down.
> 
> For each of these periods, jobs running on the affected nodes will
> be terminated (which means ALL running jobs will be terminated on
> August 6).  Queued jobs will be unaffected during all periods.
> 
> The Biowulf login node and user /home and /data directories will
> remain available during each period.