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SMISA ZDB for EVA in HP-UX LVM Mirroring Configuration
Concepts
against data loss, even if one of the I/O channels fails. For best performance, group the LVM
disks by type. When using physical volume groups, you might also want to use a strictly PVG
allocation policy for logical volumes.
In a typical LVM mirroring configuration, when the LVM disks are from different arrays, the
physical volume groups can be based on the array to which the disks belong.
SMISA and HP-UX LVM Mirroring Integration
A typical campus cluster environment can have two or more data centers with one or more
StorageWorks EVA arrays in each. You can mirror data across them using HP-UX LVM (and
MirrorDisk/UX), instead of using the CA feature of EVA. Later, during backup, you can use
only one of the data centers, or more specifically, only one array of that data center.
Data Protector is already aware of LVM mirroring and provides the feature on different ZDB
array agents of XP, EMC and VA arrays. Within SMISA, support for HP-UX LVM and the
backup of data objects residing on one or more EVA arrays is already available. Now, through
support of LVM mirroring of physical volumes in EVA arrays residing on different data
centers, you can also perform BC pair creation selectively during ZDB backup.
Selection of Mirror Set for Replication
Understanding HP-UX LVM and its mirroring functionality helps SMISA identify the mirrors
and the composition of each mirror of a logical volume belonging to the Volume Group to be
replicated. By selecting an appropriate side of the mirror, and thereby the Physical Volume
Group to which it belongs, SMISA can create BC pairs on only a few of the arrays. At the same
time, it also ensures the entire Volume Group is replicated.
SMISA selects a mirror set to use for replication through the following rules:
1. Physical Volumes of secondary and tertiary mirrors must not belong to the arrays in
which primary mirror resides. If they do, the primary mirror will be selected for backup.
2. All Logical Volumes in a Volume Group must have their extents located on the selected
Physical Volume Group.
3. If the first two rules are satisfied, use the preferred Physical Volume Group.
LVM Mirroring Configurations
For high availability requirements, HP-UX LVM recommends grouping the physical volumes
of a volume group into Physical Volume Groups (PVG) to avoid single point of failure
situations. When creating a logical volume, you should specify PVG-strict as the policy for
mirror creation. HP-UX LVM will then create mirrors of that logical volume residing on
different PVG.
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Chapter 1
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