I amended the patch. Now:
- the behaviour is controlled by a sysctl (off by default)
. - a 1s delay is done after each drive spin up, making things
easier for the system power supply
- no need to define anything; APM or ACPI methods are chosen
according to what has been made available
I eventually got around to hack scsi_da.c to implement spin down/up on
suspend/resume events of APM or ACPI. Actually the ACPI stuff is
untested and the APM once didn't work properly on my system: one of
the disks, after resume, was misbehaving (hardware errors). A power
toggle fixed the problem,
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