Configuring Disk Array Devices; Changing The Device Parameters - HP XP7 Configuration Manual

2. If the disk array LUNs are defined after the IBM system is powered on, issue a cfgmgr
command to recognize the new devices.
3. Use the lsdev command to display system device data and verify that the system recognizes
the newly installed devices.
The devices are listed by device file name. All new devices should be listed as Available. If
they are listed as Define, you must perform additional configuration steps before they can be
used.
The following example shows that the device hdisk0 is installed on bus 60 and has TID=5
and LUN=0:
#lsdev -Cc disk
hdisk0 Available 10-60-00-5, 0 16 Bit SCSI Disk Drive
hdisk1 Available 10-60-00-6, 0 16 Bit SCSI Disk Drive
4. Record the device file names for the new devices. You will use this information when you
change the device parameters. For information about changing the device parameters, see
"Changing the device parameters" (page
5. Use the lscfg command to identify the AIX disk device's corresponding array LDEV
designation.
For example, enter the following command to display the emulation type, LDEV number, CU
number and array port designation for disk device hdisk3.
# lscfg

Configuring disk array devices

Disks in the disk array are configured using the same procedure for configuring any new disk on
the host. This includes the following procedures:
"Changing the device parameters" (page 85)
"Assigning the new devices to volume groups" (page 87)
"Creating the journaled file systems" (page 89)
"Mounting and verifying the file systems" (page 91)
Creating scripts to configure all devices at once can save you considerable time.

Changing the device parameters

When the device files are created, the system sets the device parameters to the system default
values. You might need to change a few of those values for each new OPEN-x device: For more
information, see
Read/write (R/W) timeout value
Queue depth
Queue type
Table 21 Device parameters-read/write timeout and queue type (IBM AIX)
Parameter
Read/write timeout
Queue type
vl hdisk3
Table 21 (page 85) and
Default Value
30
None
85).
Table 22 (page 86).
Required Value
60
Simple
Configuring disk array devices 85