SMISA ZDB for HP StorageWorks EVA in HP-UX LVM Mirroring Configuration

SMISA ZDB for EVA in HP-UX LVM Mirroring Configuration
Overview
Chapter 1 5
Overview
Until now, while performing ZDB in HP-UX LVM mirrored configurations, SMISA considers
the whole of a Volume Group as an object-for-backup and replicates all Physical Volumes in
that Volume Group. At the same time it ignores the fact that a subset of the Physical Volumes
itself holds all the data contained in the entire Volume Group.
ZDB on HP-UX LVM Mirrored Configurations
When SMISA is added with HP-UX LVM mirroring functionality, it now has the intelligence
to understand an LVM mirrored configuration. With this knowledge it identifies those
Physical Volumes whose replications will provide a complete picture of the Volume Group and
all the Logical Volumes residing on it. This helps in fully replicating the entire Volume Group
inside the array by selecting the leave-behind-replica option in the backup specification.
In addition, when HP-UX LVM mirrors are created on different EVA arrays, SMISA now
creates replicas on only one of the arrays (before, SMISA ZDB created replicas on both
arrays).
When performing ZDB on a HP-UX LVM mirrored configuration that involves more than one
array, replicas are created on only one or a few of the participating arrays. Because of this, IR
is no longer possible.
ZDB on HP-UX LVM mirroring configurations was designed to meet the following
requirements:
• BC pair creation is supported on only one side of the mirror.
• Data backed up using a ZDB disk/tape backup session can be restored only from tape.
• Data backed up using a ZDB tape backup session can be restored from tape.
The IR limitation is imposed by the SMISA with HP-UX LVM mirroring functionality and not
by the HP-UX LVM.