Hitachi ShadowImage for IBM z/OS User"s Guide (T5213-96002, June 2007)

About ShadowImage™ for IBM
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z/OS
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Operations 2-21
Hitachi ShadowImage™ for IBM
®
z/OS
®
User’s Guide
Virtual LVI
Virtual LVI volumes can be assigned to SIz pairs, provided that the T-VOL has
the same capacity as the S-VOL. If you need to perform Virtual LVI operations
on an existing SIz S-VOL or T-VOL, you must delete the pair first to return the
volume to simplex status.
Cache Residency Manager
Cache Residency Manager for z/OS volumes can be assigned to SIz pairs, and
Cache Residency Manager for IBM z/OS operations can be performed on
existing SIz S-VOLs and T-VOLs.
Caution: See section Suspend Pair Operation for important information on
performing quick restore operations on Cache Residency Manager for IBM z/OS
volumes.
Volume Security
Volume Security operations do not directly affect SIz operations. Secure LDEVs
can be assigned to SIz pairs, and SIz volumes can be secured. A secure LDEV
will accept SIz initial and update copy operations. However, you cannot specify
volumes that are selected as invalid T-VOLs for SIz T-VOLs. When an S-VOL is
secured by Volume Security, this setting does not apply to the corresponding
T-VOLs.
Note: SIz T-VOLs cannot be accessed by any host except when the pair is
split.
Volume Retention Manager
Normal volumes have the read/write attribute so that you can access and
update the data without any restrictions. By using Volume Retention Manager,
you may set the read only attribute, which prohibit writing operation, or the
protect attribute which prohibit both reading and writing operations.
Remember that you cannot create SIz pairs with the volumes with protect
attribute.