Copy-on-Write Snapshot operations
Copy-on-Write Snapshot normally creates virtual volumes for copying on
write without specifying LUNs as S-VOLs. However, to use a Copy-on-Write
Snapshot volume via the host, it is necessary to map the Copy-on-Write
Snapshot S-VOL to a LUN. Therefore, CCI provides a combined command to
enable the user or application to use the same CCI command in order to
maintain ShadowImage compatibility.
Copy-on-Write Snapshot uses two techniques, one called "V-VOL mapping"
(or virtual volume mapping) and the other is "Snapshot using copy on write"
or "Copy-on-write snapshot." Copy-on-Write Snapshot volumes are also put
into pooling volumes called a "Snapshot pool," and a Snapshot pool is
specified as a pool ID when a Snapshot is made. Copy-on-Write Snapshot and
volume mapping is illustrated in
Figure 6-13 Copy-on-Write Snapshot and
.
Figure 6-13 Copy-on-Write Snapshot and volume mapping
Copy-on-Write Snapshot volumes
The specifications for Copy-on-Write Snapshot volumes are:
•
Allowable type of paired volume: The supported volume type is OPEN-V
only for P VOL, and OPEN-0V for S VOL.
•
Number of volumes (Copy-on-Write Snapshot) can be paired: This
depends on P VOL capacity, Copy-on-Write Snapshot pool capacity, and
shared memory capacity on the RAID storage system.
•
Duplicated writing mode: Copying on write.
•
Number of mirror volumes:
Data replication operations with CCI
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Command Control Interface User and Reference Guide
Summary of Contents for HUS VM
Page 10: ...x Command Control Interface User and Reference Guide ...
Page 18: ...xviii Preface Command Control Interface User and Reference Guide ...
Page 78: ...2 50 CCI software environment Command Control Interface User and Reference Guide ...
Page 154: ...4 8 Starting up CCI Command Control Interface User and Reference Guide ...
Page 191: ...Provisioning operations with CCI 5 37 Command Control Interface User and Reference Guide ...
Page 280: ...6 56 Data replication operations with CCI Command Control Interface User and Reference Guide ...
Page 286: ...6 62 Data replication operations with CCI Command Control Interface User and Reference Guide ...
Page 302: ...7 16 Data protection operations with CCI Command Control Interface User and Reference Guide ...
Page 324: ...8 22 Examples of using CCI commands Command Control Interface User and Reference Guide ...
Page 524: ...9 200 Troubleshooting Command Control Interface User and Reference Guide ...
Page 529: ...Command Control Interface User and Reference Guide ...