Cascade Connection Of Snapshot With Simple Dr S-Vol; V-Vols Number Of Snapshot - Hitachi AMS2100 User Manual
Ams 2000 family copy-on-write snapshot
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Also See for AMS2100:
- Getting started manual (54 pages) ,
- Hardware manual (306 pages) ,
- Service manual (192 pages)
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Cascade connection of SnapShot with Simple DR S-VOL
Table 1-2: Read/Write Instruction to a SnapShot P-VOL on the
Simple DR S-VOL
Synchronizing
Split
Inconsistent
NOTE: Failure in this table excludes a condition in which access of an LU
is not allowed (for example, LU blockage).
V-VOLs number of SnapShot
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
One LU is used for a P-VOL on SnapShot and an S-VOL on Simple DR.
Table 1-2
shows whether a read/write from/to a P-VOL of SnapShot
on the remote side is possible when a P-VOL of SnapShot and an S-
VOL of Simple DR are the same LU.
•
Remote Side (Simple DR)
Paired
+, R
Paired
+, R
+, R/W
R/W
+, R
R
∆
, R/W
+, R/W
Takeover
∆
, R/W
Busy
+, R
Pool Full
+ indicates a possible case, – indicates an impossible case
∆
indicates a case where a pair operation causes an error (a case that
can occur as a result of a change of the pair status to Failure)
R/W: Read/Write by a host is possible.
R: Read by a host is possible but write is impossible.
W: Write by a host is possible but read is impossible.
R/W: Read/Write by a host is impossible.
•
V-VOLs of up to 32 generations can be made even in the case where
the P-VOL of SnapShot is cascaded with the P-VOL and S-VOL of
Simple DR in the same way as in the case where no cascade
connection is made.
SnapShot overview
SnapShot P-VOL
Reverse
Split
Synchronizing
–
+, R
–
+, R
+, R/W
+, R/W
–
+, R
∆
–
, R/W
+, R/W
+, R/W
–
+, R/W
–
+, R
Failure
Failure
(Restore)
–
+, R
–
+, R
∆
+, R/W
, R/W
–
+, R
∆
–
, R/W
∆
+, R/W
, R/W
–
+, R/W
∆
–
, R
1-11
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