Hey there,

we were just re-cabling some of the power cords on our DS4243 shelfs with 4 PSUs and 24x 15k 600GB SAS.

When I power down one of the 4 available PSUs in the DS4243, I get the following messages in system log and autosupports are generated:

Wed Feb 6 19:28:15 CET [barricade:ses.status.psError:CRITICAL]: DS4243 (S/N SHJHU000000055F) shelf 2 on channel 0a power error for Power supply 4: critical status; power supply failed. This module is on the rear side of the shelf, at the bottom right.

Wed Feb 6 19:28:15 CET [barricade:ses.status.volError:CRITICAL]: DS4243 (S/N SHJHU000000055F) shelf 2 on channel 0a voltage error for Voltage sensor 8: unrecoverable error. This module is on the rear side of the shelf, at the lower right, on the power supply.

Wed Feb 6 19:28:15 CET [barricade:ses.psu.powerReqError:CRITICAL]: Not enough power supplies are present in channel 0a disk shelf 2 to satisfy disk drive and shelf power requirements.

Wed Feb 6 19:28:15 CET [barricade:monitor.shelf.fault:CRITICAL]: Fault reported on disk storage shelf attached to channel 0a. Please check fans, power supplies, disks, and temperature sensors.

Wed Feb 6 19:28:15 CET [barricade:callhome.shlf.fault:error]: Call home for SHELF_FAULT

Wed Feb 6 19:28:15 CET [barricade:monitor.shelf.configError:CRITICAL]: Enclosure services has detected an error in access to shelves or shelf configuration 0a.

Wed Feb 6 19:28:15 CET [barricade:callhome.config:warning]: Call home for CONFIGURATION_ERROR

Wed Feb 6 19:29:00 CET [barricade:monitor.globalStatus.critical:CRITICAL]: Disk shelf fault. Disk shelf configuration error.

Wed Feb 6 19:29:11 CET [barricade:ses.status.psInfo:info]: DS4243 (S/N SHJHU000000055F) shelf 2 on channel 0a power supply information for Power supply 4: normal status.

Wed Feb 6 19:29:11 CET [barricade:ses.status.volInfo:info]: DS4243 (S/N SHJHU000000055F) shelf 2 on channel 0a voltage information for Voltage sensor 8: normal status.

Wed Feb 6 19:29:11 CET [barricade:monitor.shelf.fault.ok:info]: Fault previously reported on disk storage shelf attached to channel 0a has been corrected.

Wed Feb 6 19:29:11 CET [barricade:monitor.shelf.configError.ok:info]: Enclosure services-detected configuration error has been corrected on channel 0a.

Wed Feb 6 19:30:00 CET [barricade:monitor.globalStatus.ok:info]: The system's global status is normal.

Why exactly does it think that there are not enough power supplies present if I just shut down one of them? I was under the assumption that a full SAS shelf can work with 2 PSUs and a full SATA shelf can work with 1 PSU without problems. Am I wrong?

Nothing happend to the filers, no takeover, no errors, etc., but the message in the logs puzzles me.

Thanks && bye,

Alexander Griesser

System-Administrator

ANEXIA Internetdienstleistungs GmbH

Telefon: +43-463-208501-320

Telefax: +43-463-208501-500

E-Mail: ag@anexia.at

Web: http://www.anexia.at

Anschrift Hauptsitz Klagenfurt: Feldkirchnerstraße 140, 9020 Klagenfurt

Geschäftsführer: Alexander Windbichler

Firmenbuch: FN 289918a | Gerichtsstand: Klagenfurt | UID-Nummer: AT U63216601

Type	PSUs	Expected Behavior
SAS	4	Normal operation. All disks will spin up at the same time.
	3	Staggered disk spin-up. Six drives per column (four columns) will spin up at a time with 12-second intervals between each column.
	2	Staggered disk spin-up as above.
	1	The shelf will still function but with several issues. Any drives that are currently powered up when reduced to one PSU will continue to function. From a cold boot, some drives (undetermined) will not spin up due to a lack of power once a certain number of drives have spun up. This is an unsupported operating condition.
SATA	4	Normal operation. All disks will spin up at the same time.
	3	Staggered disk spin-up. Six drives per column (four columns) will spin up at a time with 12-second intervals between each column.
	2	Staggered disk spin-up as above.
	1	Staggered disk spin-up with one difference. The first three columns, six disks each, will spin up with the normal 12-second interval. The fourth column will spin up five of six disk drives with the sixth drive (bay 23) spinning up 12 seconds later.