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N-way mirror
Extension to RAID 1 level. It has N copies of the disk. N-way mirror allows N-1
hard drives failure or unplugging.
RAID 3
Striping with parity on the dedicated disk. RAID 3 allows one hard drive failure
or unplugging.
RAID 5
Striping with interspersed parity over the member disks. RAID 5 allows one hard
drive failure or unplugging.
RAID 6
2-dimensional parity protection over the member disks. RAID 6 allows two hard
drives failure or unplugging. If it needs to rebuild two hard drives at the same
time, it will rebuild the first one, then the other in sequence.
RAID 0+1
Mirroring of RAID 0 volumes. RAID 0+1 allows two hard drive failures or
unplugging, but at the same array.
RAID 10
Striping over the member of RAID 1 volumes. RAID 10 allows two hard drive
failure or unplugging, but in different arrays.
RAID 30
Striping over the member of RAID 3 volumes. RAID 30 allows two hard drive
failure or unplugging, but in different arrays.
RAID 50
Striping over the member of RAID 5 volumes. RAID 50 allows two hard drive
failures or unplugging, but in different arrays.
RAID 60
Striping over the member of RAID 6 volumes. RAID 40 allows four hard drive
failures or unplugging, every two in different arrays.
JBOD
The abbreviation of “Just a Bunch Of Disks”. No data protection. RG fails if any
hard drive failures or unplugs.
4.2
RG migration
To migrate the RAID level, please follow below procedures.
1.
Select “/ Volume configuration / RAID group”.
2.
Mouse moves to the gray button next to the RG number; click “Migrate”.
3.
Change the RAID level by clicking the down arrow to “RAID 5”. There will be a pup-up
which indicates that HDD is not enough to support the new setting of RAID level, click
“
” to increase hard drives, then click
“
“ to go back to setup page. When doing migration to lower
RAID level, such as the original RAID level is RAID 6 and user wants to migrate to RAID 0,
system will evaluate whether this operation is safe or not, and appear a message of "Sure to
migrate to a lower protection array?” to give user warning.