[Semibug] RAID 0 or 1 for OpenBSD

Josh Grosse josh at jggimi.net
Thu Jul 8 20:41:33 EDT 2021

On Thu, Jul 08, 2021 at 01:37:58PM -0600, Jonathan Drews wrote:

> ...I want to use RAID to speed up my backups....

Be careful.  RAID is **not** backup.  The acronym stands
for "Redundant Array of Inexpensive (or Independent) Disks."  

Anything you write to a RAID array (level 1 or higher) is
written across at least 2 disks so that your array can 
withstand the loss of a disk drive.  That's redundancy.

You scribble something in error onto the array, that bad
information is written redundantly. There's no recovery of
destroyed or damaged data due to an operational or programmatic

It is *possible* to employ RAID arrays as a component of backup,
But RAID ain't backup.

And RAID 0 isn't RAID, because it isn't redundant at all; it is
just striping blocks over the array.  Lose one disk, lose all
your data in the entire array.  RAID 0 can be useful in some
situations: such as temporary data storage, or combined with
another RAID level.

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