Help, my disk array has one dead member

[Karl Auer]

On Thu, 2017-03-23 at 18:34 -0700, Kevin O'Gorman wrote:
> I didn't know that 3 drives is enough for redundancy;  I thought it
> was 4.

You can have redundancy with only two drives in a RAID1 configuration
(mirrored). You don't have any error correction, but you do have
redundancy.

If you go for RAID5, be aware that it is fairly slow to write. Very
safe though, and good error recovery. RAID6 is even safer, and should
be considered once you start to get much over 5 or 6 terabytes, because
the error rates even on modern drives start to make bit errors pretty
much inevitable.

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://twitter.com/kauer389

GPG fingerprint: A52E F6B9 708B 51C4 85E6 1634 0571 ADF9 3C1C 6A3A
Old fingerprint: E00D 64ED 9C6A 8605 21E0 0ED0 EE64 2BEE CBCB C38B