Lu Shared With P-Vol On Snapshot And P-Vol On Truecopy; One Lu Used For P-Vol On Snapshot And S-Vol On Truecopy - Hitachi AMS2100 User Manual

LU shared with P-VOL on SnapShot and P-VOL on TrueCopy

Table 1-3: Read/Write Instructions to SnapShot P-VOL on the
TrueCopy P-VOL
Synchronizing
Split
Failure
NOTE: Failure in this table excludes a condition in which access of an LU
is not allowed (for example, LU blockage).

One LU used for P-VOL on SnapShot and S-VOL on TrueCopy

Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
Table 1-3 shows whether a read/write to/from a SnapShot P-VOL on
the local side is possible or not in the case where a SnapShot P-VOL
and a TrueCopy P-VOL are the same LU.
•
Local Side (TrueCopy)
Paired
+, R/W
Paired
+, R/W
+, R/W
R/W
+, R
R
+, R/W
R/W
+, R
R
+, R/W
R/W
+ 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.
•
Table 1-4 shows whether a read/write from/to a P-VOL of SnapShot
on the remote side is possible or not in the case where a P-VOL of
SnapShot and an S-VOL of TrueCopy are the same LU.
SnapShot overview
SnapShot P-VOL
Synchronizing Split
(Restore)
–
+, R/W
–
+, R/W
+, R/W +, R/W
–
+, R
∆
, R/W +, R/W
–
+, R
–
+, R/W
Failure
Failure
(Restore)
–
+, R/W
–
+, R/W
∆
+, R/W , R/W
–
+, R
∆ ∆
, R/W , R/W
∆
–
, R
∆
–
, R/W
1-13