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Re: F***ING RAID!
12/01/11 01:29 PM
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> So all of these supposed redundancy benefits of RAID are shite? One type of RAID is
> supposed to protect against data loss, but when it happens, chances of recovery are
> infinitesimal?? Screw that.
RAID (besides RAID0) protects a single mode of data loss: sudden catastrophic disk failure. Besides that, all it does is give you incremental performance gains. If the host writes bad data to the RAID, it will faithfully stripe and mirror it. If a disk in the set starts doing bad reads, there's no way to know which disk is good and which is bad. If you want protection against these kinds of data loss, RAID isn't the answer. You want a storage pool solution with block checksum, journalling, copy-on-write, snapshots and full redundancy. Filesystems like ZFS and BTRFS aim to provide this, with tradeoffs elsewhere.
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