sd fails to power up some disks
The firmware in some newer drives (2TB+) apparently have limited power management support. sd attempts to use power management on attach and the PM framework produces:
"WARNING: Device /scsi_vhci/disk@g5000c50034f6d347 failed to power up."
The device is not accessible if this happens.
Disabling the use of the POWER CONDITION parameter for START STOP UNIT in sd via
sd-config-list = "<vendor and product strings from format(1) inquiry including spaces>", "power-condition:false";' is sufficient to resolve this.
There is probably something wrong with sd.
Updated by Albert Lee about 8 years ago
- Assignee set to Albert Lee
If the "pm-capable" property was set by the HBA driver,
sd_pm_setup tests START STOP UNIT, POWER CONDITION, and LOG SENSE, and will disable support for them if necessary. It does not perform these tests if "pm-capable" was not set (but support may be enabled by
sd_set_unit_attributes earlier). Not clear if this has anything to do with the affected devices.
sd_create_pm_components will always set "pm-components" (to 3 or 5 depending on whether we have POWER CONDITION) and attempt to raise power.
Updated by Albert Lee over 6 years ago
A hardware vendor has investigated this and determined that we were sending START STOP UNIT with PC set to 1 and the START bit set to 0. The problem is this is interpreted as a spin down by a device not supporting power management.
The device's VPD 8Ah and mode page 1Ah were zeroes so our PC check is not properly parsing them.