On Thu, 4 Feb 2010, Erich Dollansky wrote:
let me do.
On 04 February 2010 am 04:44:04 Warren Block wrote:
On Wed, 3 Feb 2010, Oliver Fromme wrote:
Alexander Best wrote:
No -- *Please* make sure that the disks are only spun down
upon an actual power-off command (i.e. when reboot() is
Could you elaborate a little on why that's bad? It seems like it would
be similar to a standby/resume action.
every disk has a limited number of restarts before it dies.
Okay. For future reference, here are the numbers I've seen:
power cycles (Seagate): 50,000 lifetime
normal head load/unload (Hitachi): 600,000 lifetime
emergency head load/unload (Hitachi): 20,000 lifetime
In case of a reboot, it is already known when the command is given that the
machine will restart without being powered of.
If you spin-down the disk, you lose one start cycle.
It is not that important but if it can be done with just one if, please, just
do it.
AFAICT ad_shutdown can't tell whether it's called for a reboot or a
poweroff, it's just told to "shut down". So maybe it's one if, but it's
somewhere above ata-disk.c but below reboot(RB_POWEROFF).
-Warren Block * Rapid City, South Dakota USA
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