RAIDs
Chapter 4 Storage Configuration and Expansion
55
Also consider the following:
Adding an Expansion Array
In a common scenario, a four-drive SnapServer configured as a RAID 5 is nearing
full utilization. The administrator decides to add an expansion array. The
administrator creates a RAID 5 on the expansion array, groups it with the existing
RAID on the SnapServer, and then expands the size of the original volumes using
the new storage from the expansion array.
Grouping RAIDs with other Grouped RAIDs
Just as RAIDs can be grouped, individual groups of RAIDs can be brought together
to form an even larger group. For example: A 1 TB SnapServer is running out of
capacity. Two 1 TB 12-drive expansion arrays are attached to the SnapServer to
provide increased capacity. You can configure a RAID 5 on each of the expansion
arrays, then group them together. The resulting RAID group can then be grouped
with the RAID on the SnapServer, allowing network users to take advantage of the
full capacity of the head and expansion arrays with no loss of capacity.
Deleting Grouped RAIDs
Deleting the RAID Group will delete all member RAIDs, all their volumes and
shares, and all their data. If one RAID becomes inaccessible for any reason, the
entire RAID group will also become inaccessible. Depending on the cause, the
RAID group may or may not be recoverable. For example, if a RAID group spans a
host SnapServer and an expansion array and one of the RAIDs goes down because
of a disconnected cable, the RAID group is fully recoverable by reconnecting the
cable and rebooting the system. On the other hand, if one of the RAIDs becomes
corrupted and remains unrecoverable, the data in the other RAID will also be lost.
Snapshot Pools are Combined
When two RAIDs are grouped, the size of the resulting snapshot pool is the sum of
each RAID’s formerly separate snapshot pools.
Two RAIDs at a Time
To group more than two RAIDs, create a RAID group with two RAIDs, then group
the RAID group with each RAID one at a time.
You can view your RAID group status from either the
Storage > RAID Sets
or
Monitor > System Status
screen.
Note
Only RAIDs of the same PE size can be grouped. The Web UI will notify you
if you attempt to group two RAIDs with different PE sizes.
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