The maximum repository capacity is 101 percent of the base logical drive capacity. Primary and
secondary mirror repositories are not required to be the same size. Mirror repository logical drives are
independent of the associated primary mirror or secondary mirror logical drive. They can be created on
separate logical drive groups with different RAID levels. Mirror repository logical drives must have
compatible security and T10PI quality of service as the associated mirror logical drive. For example, if a
mirror logical drive has data security enabled, the associated mirror repository must have data security
enabled. Similarly, if the mirror logical drive has T10PI enabled, the associated mirror repository logical
drive must have T10PI enabled.
Because of the critical nature of the data being stored, do not use RAID Level 0 as the RAID level of a
mirror repository logical drive.
Creating an Enhanced Global Mirrored Pair
Prerequisites
Before you create any mirror relationships, you must create an Enhanced Global Mirror Group. The
Enhanced Global Mirror Group is a logical entity that spans a local storage subsystem and a remote
storage subsystem that is used for mirroring and that contains one or more mirrored pairs. The mirrored
pairs consist of two logical drives: a primary logical drive on the local storage subsystem and a
secondary logical drive on the remote storage subsystem. If neither the primary or secondary logical
drives exist, you must create these logical drives.
Follow these guidelines when you create an Enhanced Global Mirrored Pair:
v
The Enhanced Global Mirroring premium feature must be enabled and activated on the local and
remote storage subsystems that you want to use for mirroring.
v
The local and remote storage subsystems must be connected through a proper Fibre Channel fabric or
iSCSI interface.
v
The remote storage subsystem must contain a logical drive that has a capacity that is greater than or
equal to the capacity of the logical drive that is to be used as the primary logical drive on the local
storage subsystem.
v
The RAID level of the secondary logical drive does not have to be the same as the primary logical
drive.
v
Ensure you know the passwords for both the local and remote storage subsystems.
Use these steps to create the an Enhanced Global Mirror Group pair.
1.
Enable the Enhanced Global Mirroring premium feature.
2.
Activate the Enhanced Global Mirroring premium feature.
3.
Create the Enhanced Global Mirror Group.
Enabling the Enhanced Global Mirroring premium feature
The first step in creating an Enhanced Global Mirrored Pair is to make sure that the Enhanced Global
Mirroring premium feature is enabled on both storage subsystems. Because Enhanced Global Mirroring is
a premium feature, you need a feature key file to enable the premium feature. The command for enabling
the feature key file is as follows:
enable storagesubsystem feature file=”filename”
In this command, the
filename
is the complete file path and file name of a valid feature key file. Enclose
the file path and the file name in double quotation marks (“ ”). Valid file names for feature key files end
with a
.key
extension.
You can use the
show storageArray features
command to list the premium features installed on the
storage subsystem.
Chapter 7. About Enhanced Global Mirroring premium feature
7-5
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