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Journaling no protection against power drop

Journaling no protection against power drop

Posted Sep 10, 2009 20:58 UTC (Thu) by Cato (subscriber, #7643)
In reply to: Journaling no protection against power drop by anton
Parent article: Ext3 and RAID: silent data killers?

Great to see your testing tool, I will try this out on a few spare hard drives to see what happens.

UPSs are useful at least to regulate the voltage and cover against momentary power cuts, which are very frequent where I live, and far more frequent than UPS failures in my experience.


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Journaling no protection against power drop

Posted Sep 10, 2009 21:34 UTC (Thu) by anton (subscriber, #25547) [Link]

It depends on where you live. Here power outages are quite infrequent, but mostly take so long that the UPS will run out of power. So then the UPS only gives the opportunity for a clean shutdown (and that opportunity was never realized by our sysadmin when we had UPSs), and that is unnecessary if you have all of the following: decent drives that complete the last sector on power failure; a good file system; and a setup that gives the file system what it needs to stay consistent (e.g., barriers or hdparm -W0). And of course we have backups around if the worst comes to worst. And while we don't have the ultimate trust in ext3 and the hard drives we use, we have not yet needed the backups for that.


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