[Neolith-users] Reminder: Neolith, Kappa and Matter downtime 2011-04-06 08:00-23:59

[Mats Kronberg]

Dear Neolith, Kappa and Matter users,

A reminder:

On Wednesday April 6th (2011-04-06) all NSC systems will be shut down due to
required maintenance on the power substation that supplies our computer
rooms.

We will also use this downtime to perform various upgrades and changes to
our clusters that cannot be performed during normal operations.

The downtime for Neolith, Kappa and Matter will start at 08:00 CEST. We have
scheduled the whole day for this, but will of course try to keep the actual
downtime as short as possible.

Neolith, Kappa and Matter including the login nodes will be unavailable to
users during the downtime.

Queued jobs that has a long enough walltime that they cannot finish before
the downtime will not be started. E.g 7 day jobs cannot start after
2011-03-30, 3 day jobs cannot start after 2011-04-03, etc. If you need to
run jobs in the week before the downtime, you might need to shorten your
jobs.

Jobs that are in the queue before the downtime will remain in the
queue, andwill be started normally after the
downtime.

Hint to low-priority projects: short jobs will find it easier then usual to
run in the days immediately before downtime, as they don't have to compete
with longer jobs.


A special note for Neolith users: During the last few weeks the job queue
has been shorter than normal, and last weekend it was completely empty (i.e
some nodes were idle) for a while. If you have jobs that you have not run
before due to low priority, now is a good time to do so.


Kind regards,

-- 
Mats Kronberg, NSC Support <support at nsc.liu.se>
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