Hi all
Is Disk Power management useful at Linux?
I ran `hdparm -i /dev/sda` and found that my hard disk supports AdvancedPM. So
I enabled aggressive power policy about Disk Power management as follows:
~#hdparm -B 1 -S 12 /dev/sda
which will spin down harddisk after 2 minutes idle.
But I don't see change of disk power state when Linux is idle. It is always
'active\idle'.
I profiled the IO W/R using 'iostat' and found that Linux writes disk every
10~15 seconds which means that the hard disk can not achieve 2 minutes idle
time.
These written operations prevent the harddisk spin down.
Does anyone know what is the root cause of the every 10~15 disk write even on
idle system?
Is it necessary for Linux?
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