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Chapter 7. IBM i V6.1 installation 253
To provide access to a SAS drive in the BladeCenter S chassis to the partition, at
least one SAS I/O module must be installed in the BladeCenter S chassis. An
SAS expansion adapter (CIOv) also must be installed in each IBM BladeCenter
JS23 or IBM BladeCenter JS43 Express server. A single SAS I/O module
provides access to both Disk Storage Modules (DSM) and all 12 disks.
The physical connection to tape drives is owned and managed by VIOS. The IBM
i does not have direct access to the tape. The SAS I/O expansion module also
provides a connection of an LTO tape connection for backup and restore.
After SAS disk drives are assigned to an IBM BladeCenter JS23/JS43, they
become available in an hdiskX hard disk drive. Each virtualized SAS disk drive
will be recognized as a DDxx physical disk drive in IBM i 6.1 after it has been
installed.
The concept of a chassis with a self-contained disk subsystem or storage
modules is unique to the BladeCenter S chassis. The module is a collection of
disk drives that are made accessible through a SAS module and a SAS card in
the BladeCenter JS23/JS43 server. The SAS module is responsible for both the
provisioning of physical disk drives through zoning and for failover redundancy
when two SAS modules are present. Each SAS drive in the DSM is assigned
individually.
Zoning allows you to map hard drives in storage module 1 and storage module 2
to the blade servers, and to map the blade servers to the external ports on the
connectivity module.
To ensure higher availability, the configuration of assigned SAS disk drives in the
Disk Storage Modules (DSM) can be individually configured. Information
provided in 7.1.8, “Disk configuration in BladeCenter S” on page 254, helps you
to visualize or select a predefined DSM configuration.
Note: SATA drives installed in the Disk Storage Modules (DSM) in the
BladeCenter S chassis are not supported for IBM i 6.1.
Note: To provide better RAS, use the IBM i 6.1 disk mirroring functionality for
the SAS disks provided from the VIO Server; this will protect the IBM i 6.1
installation.
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