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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...
Aha, you bring up an interesting one! I suppose it all depends where you live; e.g. here in Blighty the good 'ol IEE and BT between them have done an excellent job of protecting surges to both the supply and data comms. I guess if you're in India you'll need your own UPS connected to a generator :-)
But since almost all HDDs now auto-retract on power loss, I still assert that at worst your disks can become inconsistent and/or lose or corrupt data if writing when power loss. I would rather suggest that the power loss is the first time in a long time that the RAID array has been rebooted, and that the problems have been building for some time.
I agree a UPS is a no-brainer. But not having one does not cause complete data loss.
P.S. StephenB: Sorry, yes you are right - correlation between failures in drive batches is well documented. Outside of this I'm not convinced. Or to put it another way "What's the difference between an Actuary and a Mafia Boss?? The Actuary can predict when you'll die, the Mafia Boss can predict how..!" :-)
But since almost all HDDs now auto-retract on power loss, I still assert that at worst your disks can become inconsistent and/or lose or corrupt data if writing when power loss. I would rather suggest that the power loss is the first time in a long time that the RAID array has been rebooted, and that the problems have been building for some time.
I agree a UPS is a no-brainer. But not having one does not cause complete data loss.
P.S. StephenB: Sorry, yes you are right - correlation between failures in drive batches is well documented. Outside of this I'm not convinced. Or to put it another way "What's the difference between an Actuary and a Mafia Boss?? The Actuary can predict when you'll die, the Mafia Boss can predict how..!" :-)
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