HP XP20000/XP24000 HP StorageWorks XP Disk Array Configuration Guide (T5278-96 - Page 107

Configuring disk array devices, Changing the device parameters, Available, Define

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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 107). 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 -vl hdisk3 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 107) • "Assigning the new devices to volume groups" (page 109) • "Creating the journaled file systems" (page 111) • "Mounting and verifying the file systems" (page 113) 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 Table 23 (page 107) and Table 24 (page 108). • Read/write (R/W) timeout value • Queue depth • Queue type Table 23 Device parameters-read/write timeout and queue type (IBM AIX) Parameter Read/write timeout Queue type Default Value 30 None Required Value 60 Simple Configuring disk array devices 107

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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 107)
.
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
–
vl hdisk3
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 107)
•
“Assigning the new devices to volume groups” (page 109)
•
“Creating the journaled file systems” (page 111)
•
“Mounting and verifying the file systems” (page 113)
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
Table 23 (page 107)
and
Table 24 (page 108)
.
•
Read/write (R/W) timeout value
•
Queue depth
•
Queue type
Table 23 Device parameters-read/write timeout and queue type (IBM AIX)
Required Value
Default Value
Parameter
60
30
Read/write timeout
Simple
None
Queue type
Configuring disk array devices
107