Accusys ExaRAID GUI - Manual (Page 213)

Advanced Functions
5-40
(6) Mount the LUN of the primary volume at the host computers
• Deleting Snapshots
It is advised to delete any snapshot volume once you do not need it.
Deleting a snapshot volume frees the space it occupies in the secondary
volume, and if there is no snapshot, the performance of the primary
volume will be back to normal. You can do it freely as long as no host is
accessing it, and deleting one snapshot does not interfere with the other
snapshots of the same source volume.
• Snapshot Roaming
The snapshot configurations are stored in the disks of the secondary
volume. If “Auto Array Roaming Control” option is enabled please see
2.7.16 Miscellaneous on page 2-56, foreign hard disks with snapshot
configurations can be automatically restored during the controller boo-
up. However, if “Auto Array Roaming Control” option is turned off or auto
array roaming does not work due to configuration conflict, configurations
of disk groups and logical disks have to be restored first by importing the
foreign hard disks, and then you may proceed to manually import the
snapshots by GUI or CLI please see 2.7.12 Array roaming on page 2-
52.After the snapshots are imported either automatically or manually, you
need to set their LUN mappings.
5.5 Dynamic Capacity Management
The RAID controller enables flexibility in capacity configuration and
reconfigurations for the following benefits:
• Improving the utilization of disk capacity
• Lowering the cost of hard disks in term of procurement and energy
• Easy management without down time
• Comprehensive capacity management utilities
The firmware utilities below allow you to increase disk space:
Note
1. 1.Restoring data with a snapshot volume destroys the data on the
primary volume.
2. If selecting a snapshot volume with LUN accessed by host
computer, flush the system cache before unmouting the LUN of
the snapshot volume.
Note
Abnormal shutdown of the RAID system could cause
data loss of the snapshot volume if the lookup table on
the secondary volume is not updated.