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why is the kernel "unsleeping" a HDD put to sleep with hdparm -Y ?




So I have a 'spare' internal spinning rust bucket which I only use
for backups, and so most of the time when I'm not using it I put it
to sleep with:

sudo hdparm -Y /dev/sda

Unfortunately the kernel wakes the drive up again:

Aug 27 19:44:40 eye kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
Aug 27 19:44:40 eye kernel: ata1.00: waking up from sleep
Aug 27 19:44:40 eye kernel: ata1: hard resetting link
Aug 27 19:44:41 eye kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Aug 27 19:44:41 eye kernel: ata1.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded
Aug 27 19:44:41 eye kernel: ata1.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out
Aug 27 19:44:41 eye kernel: ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out
Aug 27 19:44:43 eye kernel: ata1.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded
Aug 27 19:44:43 eye kernel: ata1.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out
Aug 27 19:44:43 eye kernel: ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out
Aug 27 19:44:43 eye kernel: ata1.00: configured for UDMA/133
Aug 27 19:44:43 eye kernel: ata1: EH complete

Why is the kernel doing this, and how do I stop it from happening?

TIA,