I've heard (though I'd be really interested to read the studies if someone has a link) that a lot of this human error percentage comes at the hardware level. Replacing the wrong physical disk in a RAID-5 disk group, bumping cables, etc.
-Aaron On Wed, Aug 20, 2008 at 3:40 PM, Bob Friesenhahn < [EMAIL PROTECTED]> wrote: > On Wed, 20 Aug 2008, Miles Nordin wrote: > > >>>>>> "j" == John <[EMAIL PROTECTED]> writes: > > > > j> There is also the human error factor. If someone accidentally > > j> grows a zpool > > > > or worse, accidentally adds an unredundant vdev to a redundant pool. > > Once you press return, all you can do is scramble to find mirrors for > > it. > > Not to detract from the objective to be able to re-shuffle the zfs > storage layout, any system administration related to storage is risky > business. Few people should be qualified to do it. Studies show that > 36% of data loss is due to human error. Once zfs mirroring, raidz, or > raidz2 are used to virtually eliminate loss due to hardware or system > malfunction, this 36% is increased to a much higher percentage. For > example, if loss due to hardware or system malfunction is reduced to > just 1% (still a big number) then the human error factor is increased > to a wopping 84%. Humans are like a ticking time bomb for data. > > The errant command which accidentally adds a vdev could just as easily > be a command which scrambles up or erases all of the data. > > Bob > ====================================== > Bob Friesenhahn > [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ > GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >
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