DS2246 disk shelf is missing and causes a multi-disk panic

Applies to

• DS2246 Disk shelf

Description

• If a DS2246 Shelf loses all power it can cause a multi disk panic depending on the size of the storage system and the assignment of the disks.
• In this instance, Shelf 2 suddenly loses all power and does not show up in Sysconfig -a:

Shelf 0: DS2246 Firmware rev. IOM6 A: 0173 IOM6 B: 0173
Shelf 1: DS2246 Firmware rev. IOM6 A: 0173 IOM6 B: 0173
Shelf 3: DS2246 Firmware rev. IOM6 A: 0173 IOM6 B: 0173

Note: Shelf 2 is missing.

• The following alert may be seen from ONTAP if system panics:

Panic string: aggr con_stor_01_aggr1: raid volfsm, fatal multi-disk error. raid type raid_dp in SK process config_thread

• It is followed by the following dual path to Disk Shelf message:

(Health Monitor process nchm: DualPathToDiskShelf_Alert[50:0a:09:80:00:81:33:8c]) ERROR

• Power supplies still show amber lights; however, there is no disk activity or LED lights in front of the impacted disk shelf.