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[[Sdcc_users-l] ] work on BNL electrical grid on 12/30 and impact on SDCC resource

From: SDCC Announcements <announce AT rcf.rhic.bnl.gov>
To: rcfstaff AT bnl.gov, rhic-rcf-l AT lists.bnl.gov, sdcc_users-l AT lists.bnl.gov, usatlas-computing-l AT lists.bnl.gov, usatlas-ddm-l AT lists.bnl.gov, usatlas-users-l AT lists.bnl.gov, bnl-shared-tier3-l AT lists.bnl.gov
Subject: [[Sdcc_users-l] ] work on BNL electrical grid on 12/30 and impact on SDCC resource
Date: Tue, 24 Dec 2024 12:41:07 -0500

Summary:
The SDCC was informed about a major electrical intervention on 12/30 on very
short-notice. Because this
intervention comes with a small risk of an electrical power loss, the SDCC
has decided to quiet-down its
services to minimize the risk of a long-lasting recovery process with limited
staff availability during the
BNL self-declared &quot;quiet period&quot;,

Effective Time(s):
12/30/2024 9:00 am - 12/30/2024 6:00 pm

Group Responsible:
IT Fabric

Affected Area(s):
All SDCC services

Expected User Impact:
No access to SDCC resources (computing, storage and services)

Maintenance Type:
Planned Maintenance/Downtime

Description:
A critical maintenance/replacement procedure on the BNL main electrical grid
scheduled for Monday, Dec. 30th was announced
to the SDCC on very short-notice last week. This procedure is planned to
start around 12 noon and last approximately 4 hours.
We recognize this procedure is happening during the BNL-declared
&quot;quiet period&quot;, but a postponement would incur increased
costs to the Lab and potentially place this must-do procedure during the
start-up period for RHIC run 25, which is deemed even
less desirable than the current plan. BNL management has decided to go ahead
with the Dec. 30th procedure, as planned.

This procedure requires transferring the power source from the electrical
utility to the back-up generator, with an UPS to
bridge the time gap (a few seconds) between utility and generator power, and
then remain on generator power for the duration
of this procedure. Because there is a small risk of failure during the
transfer process and generator operations and because of
reduced staff availability during the &quot;quiet period&quot;, the
SDCC management has decided to quiet down the facility resources to
minimize the chances of data corruption, service disruptions and hardware
failures, in the unlikely event that an unplanned
power outage occurs.

Quieting down means: 1) draining batch jobs (HTCondor and Slurm), holding new
ones from starting and stopping interactive
access to SDCC cpu resources on Friday (Dec. 27th) evening and 2) stopping
all data read/write and movement activities
(disk and tape) on Monday (Dec. 30th) early morning.

Announcements to SDCC Liaisons and program/experimental PoC&#039;s will
be made when SDCC resources are fully available again.

SDCC Announcements page:
https://www.sdcc.bnl.gov/news-events/sdcc-announcements
Downloadable calendar invite of this event (.ics format):
https://www.sdcc.bnl.gov/announcements/make_ics.php?evt=1735062067

This item has been posted to RCF/USAtlas Staff, RHIC RCF, SDCC Users,
US-ATLAS Computing, US-ATLAS DDM, US-ATLAS Users, BNL Shared Tier 3 Users

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________________________________________________________________

[[Sdcc_users-l] ] work on BNL electrical grid on 12/30 and impact on SDCC resource, SDCC Announcements, 12/24/2024