[mythtv-users] Why RAID 5 stops working in 2009
mache at creeger.com
Thu Oct 23 03:48:17 UTC 2008
Lally Singh recommends a ZDNet piece predicting
the imminent demise of RAID 5, noting that
increasing storage and non-decreasing probability
of disk failure will collide in a year or so.
This reader adds, "Apparently, RAID 6 isn't far
behind. I'll keep the ZFS plug short. Go ZFS. There, that was it."
"Disk drive capacities double every 18-24 months.
We have 1 TB drives now, and in 2009 we'll have 2
TB drives. With a 7-drive RAID 5 disk failure,
you'll have 6 remaining 2 TB drives. As the RAID
controller is busily reading through those 6
disks to reconstruct the data from the failed
drive, it is almost certain it will see an
[unrecoverable read error]. So the read fails ...
The message 'we can't read this RAID volume'
travels up the chain of command until an error
message is presented on the screen. 12 TB of your
carefully protected — you thought! — data is
gone. Oh, you didn't back it up to tape? Bummer!"
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