How do I disable LPM on my SSD?

dbrazeau · 10-31-2011, 06:43 PM

I'm trying to figure out how to disable Link Power Management on my SSD through Linux. I've googled around a bit but all I can find is how to do it on Windows.

rtguille · 11-02-2011, 07:39 AM

# cat /sys/class/scsi_host/host0/link_power_management_policy
max_performance

In my case i think it is "disabled", since it is in max_performance...

Echoing it a "min_performance" would enable it. That change is not permanent.

Do you want to disable it for any particular reason?

There is also pcie_aspm (active state power management) that (at least for me) caused
a lot of problems witch certain hardware.

dbrazeau · 11-02-2011, 11:20 AM

Quote:

Originally Posted by rtguille

# cat /sys/class/scsi_host/host0/link_power_management_policy
max_performance

In my case i think it is "disabled", since it is in max_performance...

Echoing it a "min_performance" would enable it. That change is not permanent.

Do you want to disable it for any particular reason?

There is also pcie_aspm (active state power management) that (at least for me) caused
a lot of problems witch certain hardware.

So it doesn't look like I have that file under my scsi host... Any idea if I need to include something in my kernel build to add that file? I'm using a LSI SATA/SAS controller.