I'm replacing the drives in my 5-bay NAS, and planning how I'm going to
divide them up. My general plan is to create a matching set of
partitions on the drives, and then create RAID devices across the sets
of partitions, for example:
md1: /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1
md2: /dev/sdb2 /dev/sdc2 /dev/sdd2 /dev/sde2 /dev/sdf2
⋮ ⋮ ⋮ ⋮ ⋮ ⋮
md16: /dev/sdb16 /dev/sdc16 /dev/sdd16 /dev/sde16 /dev/sdf16
This will give me the flexibility to create RAID devices of different
types, as well as maybe(?) reducing the "blast radius" if a particular
portion of a disk goes bad.
I believe that it makes sense to use at least 2 different RAID levels -
RAID-10 for "general" use and RAID-6 for media content. Does this make
sense?
If so, does anyone have any thoughts or pointers on the chunk size,
particularly for RAID-10? (I assume that RAID-6 will have similar
considerations to RAID-5, and so a large chunk size would make sense,
particularly for large media files.)
Any other thoughts?
Thanks!
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