Simultaneous Cascading Restrictions With Shadowimage P-Vol And S-Vol - Hitachi AMS2100 User Manual

Simultaneous Cascading Restrictions with ShadowImage P-VOL and
S-VOL
1-30
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
When the firmware version of the array is 08B0/A or more, the P-VOL
and the S-VOL of ShadowImage can cascade SnapShot at the same time
as shown in Figure 1-11
the status of Paired, Paired Internally Synchronizing,
Synchronizing, or Split Pending and operating SnapShot in the Split
status as is, the performance deteriorates significantly. Start the
operation after advance verification
Figure 1-11: Simultaneous Cascading Restrictions with
ShadowImage P-VOL and S-VOL
• LU Ownership. When cascading the P-VOL and the S-VOL of
ShadowImage and SnapShot at the same time, if the owner controllers
which the data pool for SnapShot specified at the time of SnapShot pair
creation belongs are different, the pair creation is guarded. Execute the
pair operation again by changing the ownership of the specified data
pool for SnapShot or specifying the other data pool for SnapShot.
• Be careful when changing the LU ownership in the configuration in
which the P-VOL and the S-VOL of ShadowImage and SnapShot are
cascaded at the same time. Since the LU ownership change processing
operates for all LUs in the cascaded configuration and all other
SnapShot pairs using the data pool for SnapShot in the relevant pair
configuration, the performance deterioration occurs at the time of
execution. To change the ownership, perform it when the load of the
array is low.
SnapShot overview
. However, when operating ShadowImage in