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Forum Discussion
Why UPS for Spin-Down?
Hi! Just a quick question I couldn't find the answer for. Why is it recommended to use an UPS, when you turn on HDD spin-down? How can data get lost? I'm doing an incremental backup once or twice a d...
Well I disagree... First, there is a chance data is lost or corrupted when you have a lower outage. However....
- you cannot lose all of your data in this way - even if for some reason the RAID volume becomes unmountable the data is still there and can be recovered.
- ext3/4 has ordered journalling by default, and I'm sure that this is the default for ReadyNAS. In this case I understand that you could get some corrupt data if it is being overwritten at the time, but that the journal replay should bring it back to a stable state.
Otherwise, what's the point in journaling. IMHO a UPS is handy, but only if you perform an ordered shutdown when it is enabled. In any case, you can of course recover the data from your backup, right :-)
P.S. And again IMHO I have yet to see a huge benefit of spin-down. Sure you can save a bit of noise and watts, but you do place most strain on the PSU and disks when spinning back up.
- you cannot lose all of your data in this way - even if for some reason the RAID volume becomes unmountable the data is still there and can be recovered.
- ext3/4 has ordered journalling by default, and I'm sure that this is the default for ReadyNAS. In this case I understand that you could get some corrupt data if it is being overwritten at the time, but that the journal replay should bring it back to a stable state.
Otherwise, what's the point in journaling. IMHO a UPS is handy, but only if you perform an ordered shutdown when it is enabled. In any case, you can of course recover the data from your backup, right :-)
P.S. And again IMHO I have yet to see a huge benefit of spin-down. Sure you can save a bit of noise and watts, but you do place most strain on the PSU and disks when spinning back up.
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