Cascade Connection Of Snapshot With Simple Dr - Hitachi AMS2100 User Manual

Cascade connection of SnapShot with Simple DR

Cascade with a P-VOL of SnapShot
SnapShot
Cascade with a V-VOL of SnapShot
SnapShot
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
Volumes of SnapShot P-VOL can be cascaded with those of Simple
DR, as shown in Figure
lowers performance, however.
•
Host
Read / Write
P-VOL
Cascade Connection
P-VOL
V-VOL
Local
Disk Subsystem
Host
Read / Write
P-VOL
P-VOL
V-VOL
Cascade Connection
Local
Disk Subsystem
Figure 1-5: Cascade Connection of SnapShot with Simple DR
The Simple DR pair can be cascaded only with the SnapShot P-VOL
with the following restrictions placed on the cascade connection:
• Restoration of the SnapShot pair cascaded with the Simple DR
P-VOL can be done only when the status of the Simple DR pair is
Simplex, Split, or Pool Full.
SnapShot overview
1-5. Cascading of SnapShot with Simple DR
S-VOL
P-VOL
Simple DR
V-VOL
Remote
Disk Subsystem
S-VOL
Simple DR
P-VOL
V-VOL
Remote
Disk Subsystem
SnapShot
SnapShot
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