This scenario provides a high-level description of the tasks that
you must perform to configure new fixed block storage within a storage unit.
Before you begin, you must have the command-line interface prompt,
and you must be connected to a storage
unit that is used for open systems host system storage
This scenario first creates the fixed block storage configurations
and then configures the storage
unit SCSI host ports to enable access to fixed block storage. You can
run these two basic steps in the reverse order, but it is better to create
storage configurations first, thereby creating the media to back up configuration
data that is not related to the storage configuration.
- Create extent pools for fixed block volumes.
An extent
pool is a logical construct that is used to manage a set of extents of the
same type that are associated with a given rank group.
Creating the
extent pools before the arrays and ranks saves a processing step. When you
create the new ranks, you can assign them to existing extent pools. Otherwise,
you must modify each rank object to complete the extent pool ID assignment
after the extent pools have been defined. See Creating extent pools for fixed block volumes using the DS CLI for details.
- Create arrays.
An array is an arrangement of related
hard drives that have been assigned to a group. A disk array is a group of
disk drive modules (DDMs) that are arranged in a relationship; for example,
a RAID 5 or a RAID 10 array.
The creation of arrays is based on the
array sites that are associated with the storage unit. See Creating arrays for fixed block volumes using the DS CLI for details.
- Create ranks.
A rank is a logically contiguous storage
space that is made up of one or more arrays.
You must assign a rank
to every “unassigned” array object. If this is your first time creating volumes,
all the arrays show a state of "unassigned". See Creating a rank using the DS CLI for details.
- Create fixed block volumes.
A logical volume is the
storage medium that is associated with a logical disk drive. A logical volume
typically resides on one or more storage devices. It consists of one or more
data extents that are allocated from a single extent pool.
Volume attributes
identify the volume to the host system that access the volume. Each volume
is assigned a volume ID, which is the volume address within the storage image
64 KB address space. Host access to a volume is enabled when you assign the
volume ID to a volume group object. See Creating fixed block volumes using the DS CLI for
details.
- Create fixed block volume groups.
A volume group
is a collection of logical volumes. It identifies the set of fixed block logical
volumes that are accessible by one or more SCSI host system ports.
The
volume group type determines the maximum number of volumes that can be assigned
to a volume group, either a maximum of 256 volumes or a maximum of 64 000
volumes. The volume group type must be selected according to the addressing
capability of the SCSI host system that uses the volume group. See Creating fixed block volume groups using the DS CLI for details.
- Configure fibre-channel I/O ports.
The
storage unit supports the fibre-channel host bus adapter (HBA) card type.
For machine type 1750, one or two HBA cards are installed in each of the two
CEC assemblies. Each fibre-channel HBA card contains four I/O ports. The storage
image microcode automatically creates one I/O port object to represent each
HBA card I/O port. The default fibre-channel I/O port object settings enable
SCSI-FCP “identified” access to fixed block volumes. You might have to modify
the I/O port object settings to enable SCSI FC-AL access to FB volumes. See Configuring fibre-channel I/O ports using the DS CLI for
details.
- Create SCSI host port connections.
A SCSI host port
object contains attributes that identify the SCSI host system type, the port
profile, the port WWPN, the volume group ID that the port accesses, and an
array of storage unit I/O port IDs that the host port logs in to
for volume access, or an attribute to indicate that all I/O ports can be used
for volume access.
Create one SCSI host port for each port that will
access storage unit volumes. See Creating SCSI host port connections using DS CLI for
details.