D-Link DSN-6210 User Manual - Page 93

Migrate and Move RAID Groups

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D-Link Document - User Manual Sometimes, rebuild is called recover; they are the same meaning. This table describes the relationship between RAID levels and recovery. Operation RAID 0 RAID 1 N-way mirror RAID 3 RAID 5 RAID 6 RAID 0+1 RAID 10 RAID 30 RAID 50 RAID 60 JBOD Description Disk striping. No protection for data. RAID group fails if any hard drive fails or is unplugged. Disk mirroring over 2 disks. RAID 1 allows one hard drive to fail or be unplugged. You need one new hard drive to be inserted into the system for rebuild to be completed. Extension to RAID 1 level. It has N copies of the disk. N-way mirror allows N-1 hard drives to fail or be unplugged. Striping with parity on the dedicated disk. RAID 3 allows one hard drive to fail or be unplugged. Striping with interspersed parity over the member disks. RAID 5 allows one hard drive to fail or be unplugged. 2-dimensional parity protection over the member disks. RAID 6 allows two hard drives to fail or be unplugged. If it needs to rebuild two hard drives at the same time, it will rebuild the first one, and then the other in sequence. Mirroring of RAID 0 volumes. RAID 0+1 allows two hard drives to fail or be unplugged, but on the same array. Striping over the member of RAID 1 volumes. RAID 10 allows two hard drives to fail or be unplugged, but in different arrays. Striping over the member of RAID 3 volumes. RAID 30 allows two hard drives to fail or be unplugged, but in different arrays. Striping over the member of RAID 5 volumes. RAID 50 allows two hard drives fail or be unplugged, but in different arrays. Striping over the member of RAID 6 volumes. RAID 60 allows four hard drives to fail or be unplugged, two per array. The abbreviation of "Just a Bunch Of Disks". No data protection. RG fails if any hard drive failures or unplugs. Migrate and Move RAID Groups Migrate RAID Level function changes the RAID group to different RAID level or adds the member disks of the RAID group for larger capacity. Usually, the RAID group migrates to higher RAID level for better protection. To do migration, the total size of RAID group must be larger than or equal to the original RAID group. The limitation is that it's not allowed to expand the same RAID level with the same physical disks of the original RAID group. There is a similar function Move RAID Level which moves the member disks of the RAID group to totally different physical disks. In addition, the thin provision RAID group cannot execute migrate or move, it uses Add RAID Set to enlarge capacity. This is described more detail in the Thin Provision section. Copyright@2014 D-Link System, Inc. All Rights Reserved. 93

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D-Link Document – User Manual
Sometimes, rebuild is called recover; they are the same meaning. This table describes the
relationship between RAID levels and recovery.
Operation
Description
RAID 0
Disk striping. No protection for data. RAID group fails if any hard drive
fails or is unplugged.
RAID 1
Disk mirroring over 2 disks. RAID 1 allows one hard drive to fail or be
unplugged. You need one new hard drive to be inserted into the system
for rebuild to be completed.
N-way mirror
Extension to RAID 1 level. It has N copies of the disk. N-way mirror allows
N-1 hard drives to fail or be unplugged.
RAID 3
Striping with parity on the dedicated disk. RAID 3 allows one hard drive
to fail or be unplugged.
RAID 5
Striping with interspersed parity over the member disks. RAID 5 allows
one hard drive to fail or be unplugged.
RAID 6
2-dimensional parity protection over the member disks. RAID 6 allows
two hard drives to fail or be unplugged. If it needs to rebuild two hard
drives at the same time, it will rebuild the first one, and then the other in
sequence.
RAID 0+1
Mirroring of RAID 0 volumes. RAID 0+1 allows two hard drives to fail or
be unplugged, but on the same array.
RAID 10
Striping over the member of RAID 1 volumes. RAID 10 allows two hard
drives to fail or be unplugged, but in different arrays.
RAID 30
Striping over the member of RAID 3 volumes. RAID 30 allows two hard
drives to fail or be unplugged, but in different arrays.
RAID 50
Striping over the member of RAID 5 volumes. RAID 50 allows two hard
drives fail or be unplugged, but in different arrays.
RAID 60
Striping over the member of RAID 6 volumes. RAID 60 allows four hard
drives to fail or be unplugged, two per array.
JBOD
The abbreviation of “Just a Bunch Of Disks”. No data protection. RG fails
if any hard drive failures or unplugs.
Migrate and Move RAID Groups
Migrate RAID Level
function changes the RAID group to different RAID level or adds the member
disks of the RAID group for larger capacity. Usually, the RAID group migrates to higher RAID level
for better protection. To do migration, the total size of RAID group must be larger than or equal to
the original RAID group. The limitation is that it’s not allowed to expand the same RAID level with
the same physical disks of the original RAID group. There is a similar function
Move RAID Level
which moves the member disks of the RAID group to totally different physical disks. In addition,
the thin provision RAID group cannot execute migrate or move, it uses
Add RAID Set
to enlarge
capacity. This is described more detail in the
Thin Provision
section.
93
Copyright@2014 D-Link System, Inc. All Rights Reserved.