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J2012-01User Manual
Chapter 3 Sub-system Configuration Setup
3.6.5.3 How to power off/on all disk drives on a disk backplane manually
Power Supply control element
BYTE/BIT
7
6
5
4
3
2
1
0
0
COMMON CONTROL
SELECT
PRDFAIL DISABLE
RST SWAP
Reserved
1
RQST
IDENT
Reserved
2
Reserved
3
Reserved RQST FAIL RQST ON
Reserved
The "RQST ON" for Power Supply is defined in the bit5, byte3 of the "Power Supply control
element" in the SES specification. Clear the bit on Power Supply Element "DiskPowerSupply"
to power off all disk drives. Set the bit on Power Supply Element "DiskPowerSupply" to power
on all disk drives. We use the software package "sg3_utils" on Linux for example, and have a
SAS HBA and a cable to connect your host with the expander.
(A) Show the device for AIC Expander Controller (canister) on a disk backplane
$ sg_map -i
/dev/sg2 AIC 12G 2U12SAS3swap 0c01
(B) Power off all disk drives on the disk backplane
$ sg_ses --descriptor=DiskPowerSupply --clear=3:5:1 /dev/sg2
(C) Power on all disk drives on the disk backplane
$ sg_ses --descriptor=DiskPowerSupply --set=3:5:1 /dev/sg2
