NEC M310 - Cache Memory for Differential Management

5. Functions <Data Replication/Snapshot (2)>
(2) Snapshot
When using Snapshot (only), the maximum capacity of snapshot related volumes is as follows.
Model Total capacity of
dynamic pool
Max. size of LD for
snapshot
Sum of snapshot
related volumes
Max. generation
of snapshots
M110 ~ Max. Capacity 10TB 160TB 16
M310 ~ Max. Capacity 10TB 160TB 16
Snapshot （DynamicSnapVolume）
Model M110 M310
8Gb FC Host I/F ○ ○
16Gb FC Host I/F ○ ○
1Gb iSCSI Host I/F ○ ○
10Gb iSCSI(Copper) Host I/F ○ ○
10Gb iSCSI (Optical)Host I/F ○ ○
12Gb SAS Host I/F ○ -
Single Controller - -
Dual Controller ○ ○
NEC StorageManager Express(Embedded)
○ -
NEC StorageManager ○ ○
■ Snapshot Support Matrix
Sum of Snapshot Related Volumes
= Master Volume Capacity + Snapshot Volume Capacity + Snapshot Reserved Area Capacity
<Calculation Example>
Master Volume 2TB has 8 generations of snapshot volumes and the snapshot reserved area per generation is
20%.
Snapshot Reserved Area = 2TB x 20% x 8 = 3.2TB
Sum of Snapshot Related Volumes = 2TB + 16TB + 3.2TB = 21.2TB
○：Supported －：Not supported
Snapshot
#1
Snapshot
#2
Snapshot
#3
Snapshot
#8
Differentia
l Data
Master
2TB
2TB
2TB
2TB
2TB
16TB
Snapshot
Reserved
Area
Updated
Differential
3.2T
B
8 generations
71
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