RAID

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Redundant Array of Inexpensive Disks

ACHTUNG don't forget block/partition alignment!

 

Cache settings

write through

write back

always write back

HOWTO

Remove raid metadata from disk

DISK=/dev/sdc
# the last bit
dd if=/dev/zero of=$DISK bs=512 seek=$(( $(blockdev --getsz $DISK) - 1024 )) count=1024
# the first bit
dd if=/dev/zero of=$DISK bs=512 count=1


FAQ

Raid levels

RAID 0

stripe

RAID 1

mirror

BBU

Relative State of Charge

Should be well above 90%