Hitachi G900 - Page 82

Shared
memory
function
Factors affecting shared memory (SM) capacity
1, 2
Shared
memory
capacity
Software
SI / VM
3
TI
4
TC / UR
5
DP
4
DT /
active
flash
Ddp-
Cmp
1. DP: Dynamic Pr
ovisioning, DT: Dynamic Tiering, SI: ShadowImage, VM: Volume
Migration, Volume Migration V2, TC: TrueCopy, UR: Universal Replicator, TI: Thin
Image, Ddp-Cmp: Dedupe and Compression
2. Yes: Program products are usable.
No: Program products are unusable.
3. The resources such as a dierence table and a pair table are necessary when
using ShadowImage or Volume Migration (including Volume Migration V2).
Refer to Hitachi ShadowImage
®
User Guide for the number of pairs that can be
created by ShadowImage.
Refer to Hitachi Volume Migration User Guide for the number of migration plans
that can be created by Volume Migration.
4. When usingDynamic Provisioning/Dynamic Tiering/active ash/Thin Image, the
pool/virtual volume capacity that can be created is enhanced according to the
addition condition of Shared Memories.
To create cascaded pairs or pairs with the clone attribute, install shared memory
by specifying “Extension1”.
5. Refer to Hitachi TrueCopy
®
User Guide for the number of pairs that can be created
by TrueCopy.
Refer to Hitachi Universal Replicator User Guide for the number of pairs that can be
created by TrueCopy.
The following table shows the usable capacity of the pool or virtual volume.
Table 21 Usable capacity of the pool/virtual volume (VSP G900)
Shared memory
Maximum pool or virtual volume capacity
(PB)
Base 0.2
Extension1 0.5
Extension2/Extension3 2.0
Extension4 6.5
Shared memory
Appendix B: System Specications
Hitachi Virtual Storage Platform G900 Hardware Reference Guide 82