RAID1 is traditionally a mirror only setup (ok, some RAID
implementations may do some load-balancing of some sort). So a RAID1
with 4 disks is one data set copied onto 4 disks. Bandwidth is roughly
the same as a single disk (ignoring any load balancing).
RAID10 is mirror and stripe. A RAID10 with 4 disks is similar to a 2
disk RAID0 (double bandwidth with data split in half across both disks),
but with each disk having a mirror (which brings the total up to 4 drives).
Additionally, a RAID1 disk (at least using MD) can be accessed just like
a normal disk (good for recovery etc.) however a single disk out of a
RAID10 array is next to useless.
Just so I can sleep at night, is my understanding of RAID10 and RAID1
above correct?
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