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ZFS and Spin-down HDD's
Posted: 18 Jun 2013 13:16
by neptunus
how true is this and what are your experiences?
http://wiki.nas4free.org/doku.php?id=warnings
Re: ZFS and Spin-down HDD's
Posted: 18 Jun 2013 14:30
by Eldor1
Hi!
I can confirm this, cause I simply tried it with a ZFS-R1 (4x HDD). And boy ZFS didn't liked it!!!
Had a quite hard time to undo this setting. The Main-reason is in my opinion the raid-function i used. Maybe it works, if every HDD is a foreign Pool/vdev. But then ZFS makes not really sense anymore...
Have a nice day!
Re: ZFS and Spin-down HDD's
Posted: 19 Jun 2013 04:06
by dnar
I have been spinning down drives in a 6 drive Z2 array and also a 7 drive Z1 for years without issues. I use a 120 minute timeout.
Re: ZFS and Spin-down HDD's
Posted: 19 Jun 2013 07:53
by b0ssman
i am also spinning down my discs.
if the spinup time is bigger than the timeout of zfs waiting for the disk, then i could see how that would be bad.
anyone know what that timeout is with zfs?
Re: ZFS and Spin-down HDD's
Posted: 20 Jun 2013 06:26
by dnar
b0ssman wrote:i am also spinning down my discs.
if the spinup time is bigger than the timeout of zfs waiting for the disk, then i could see how that would be bad.
anyone know what that timeout is with zfs?
From memory, there are no I/O timeouts within ZFS itself. ZFS will hang indefinitely.
Just as with TLER, spun down disks don't cause an issue that I am aware of.