Bull Escala Power7 Series, Manual

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Before you begin
Gather and have available any planning and cabling documentation that you have for the system to
which you are connecting in a clustered environment so that you can refer to it during this procedure.
About this task
To assure that the SCSI disk drive enclosure is ready to be connected to the cluster, complete the
following steps:
Procedure
1. Ensure that each SCSI device that is connected to the shared SCSI bus has a unique ID. A common
configuration is to set the SCSI ID of the adapters on the nodes to be higher than the SCSI IDs of the
shared devices. (Devices with higher IDs take precedence in a SCSI bus contention.)
v
Use the command
lscfg | grep scsi
to determine and record the logical name of each adapter. In
the command output, the first column lists the logical name of the SCSI adapter, such as
+ SCSI0
.
v
Use the
lscfg -vpl
command and logical name of the adapter to record the I/O slot (physical slot)
that each SCSI adapter uses, for example,
lscfg -vpl scsi0
, where scsi0 is the logical name of the
adapter.
v
Use the
lsattr
command, as in the following example, to find the ID of the adapter scsi0:
lsattr
-E -l scsi0 | grep id
Note: Do not use wildcard characters or full path names on the command line for the device name
designation.
In the resulting output, the first column lists the attribute names. The integer to the right of the ID
attribute is the adapter SCSI ID.
2. If a SCSI adapter address conflict exists, go to the next step. If no conflict exists, return to the SCSI
connection method overview that referred you to this procedure.
3. Examine the cabling to see if the correct ports on the system are connected to the correct ports on the
repeater cards on the disk drive enclosure. For example, if you are connecting the system using two
host adapter cards and a dual repeater card as shown in the following figure, connect the systems as
in the instructions that follow.
46
Enclosures and expansion units