Les Mikesell wrote at about 11:31:28 -0500 on Saturday, April 9, 2011:
 > On 4/9/11 12:28 AM, Saturn2888 wrote:
 > > :: mdadm ::
 > This is what I use, with a raid1 created with 3 members but one missing.  I 
 > periodically rotate disks into a hotswap sata bay, add it long enough to 
 > re-sync, and then fail and remove it to take offsite.  The sync
 > operation do

I tried this just *once* and ended up losing 2 years of backups!
Specifically, I had been running software RAID1 on 2 1TB disks for 2
years without any problems. Then on Black Friday, I bought a new 1TB
disk and had the brilliant idea of adding it temporarily to my RAID
array to create a backup.  I mounted it via an external USB
enclosure. Well, somehow it crashed during rebuilding, leaving the new
3rd disk unreadable and corrupting the pool on the original disk --
specifically, a number of pool files and directories were deleted or
became unreadable. Not sure how and/or why this happened, but the
LESSON is that RAID is not perfect and it can corrupt everything. If I
do this again in the future, I probably should at a minimum remove one
of the internal drives to use as backup later on in case something
happens. Alternatively, I probably would have been better just taking
BackupPC offline and doing a 'dd' to the new disk

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