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Spin down oly works for 2 of 5 disks

  • Pelle Svensson
    Pelle Svensson


    I can't get spin-down to work for more than my 2 first disks.
    I run ubuntu server 2.6.22 with hdparm v8.9

    I have 5 disks
    /dev/sda - PATA
    /dev/sdb - SATA - Hitachi (same type)
    /dev/sdc - SATA - Hitachi (same type)
    /dev/sdd - SATA - Hitachi (same type)
    /dev/sde - SATA - Western

    1. If I issue hdparm -S2 /dev/sda  ( sdb sdc sdd sde )

    sda and sdb react as they should. Disk spin down in 10 seconds.
    sdc,sdd and sde nothing happens. Disk stay in active/idle. (verify by issue hdparm -C /dev/...)

    2. I can manually put all disks in standby with hdparm -y /dev/sd[a,b,c,d,e]

    3. If I issue hdparm -S2 /dev/sdd on a standby device it first spin up the disk before returning the command.

    4. It dose not help if I physically swap disk sdb and sdd

    5. It dose not help if I change motherboard from P4C800-E to P5KPL-VM

    Any idea why can't I control sdc/sdd/sde......?
    It seems to be an issue if I google around, several have problems with spin-down and hdparm


    • Hi,

      I had exactly the same problem. For some drives I could set the standby-timer and for others I couldn't (at last it didn't work on every drive!), although they were all (6) of the same kind (Hitachi). Wasting hours in trying a lot of things I found a solution (kinda workaround) today which works (at least for me).


      1. install "smartmontools"
      2. run: smartctl -t short /dev/sda (sdb ,sdc ,sdd ,sde ,sdf,... sdx)
      3. set timer: hdparm -S... /dev/sda (sdb ,sdc ,sdd ,sde ,sdf,... sdx)

      I have no idea why initiating a short smart-selftest-scan enables the ability to set the standby-timer, but it worked for me on all 6 drives. It also "survived" reboot etc. Of course I have no idea yet if the problem is being fixed permanently.

      Hope this might help you and others.

      So long,