HP StorageWorks XP12000 HP StorageWorks XP Disk Array Configuration Guide: IBM - Page 16

Configuring disk array devices, Changing the device parameters

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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 do more configuration before they can be used. Example #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 The example shows that Device hdisk0 is installed on bus 60 and has TID=5 and LUN=0. 4. Record the device file names for the new devices. You will use this information in changing the device parameters. 5. Use the lscfg command to find out the AIX disk device's corresponding array LDEV designation. Example # lscfg -vl hdisk3 In this example, the emulation type, LDEV number, CU number and array port designation should all be displayed for disk device 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 • Assigning the new devices to volume groups • Creating the Journaled File Systems • Mounting and verifying the file systems Creating scripts to configure all devices at once may 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 may need to change a few of those values for each new OPEN-x device: See Table 4 and Table 5. • Read/write (R/W) timeout value • Queue depth • Queue type Table 4 Device parameters-read/write timeout and queue type Parameter Read/write timeout Default Value 30 Required Value 60 16 Installing and configuring AIX for the XP disk array

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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 do more configuration before they can be used.
Example
#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
The example shows that Device hdisk0 is installed on bus 60 and has TID=5 and LUN=0.
4.
Record the device file names for the new devices. You will use this information in changing the
device parameters.
5.
Use the
lscfg
command to find out the AIX disk device's corresponding array LDEV designation.
Example
# lscfg
–
vl hdisk3
In this example, the emulation type, LDEV number, CU number and array port designation should
all be displayed for disk device
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
•
Assigning the new devices to volume groups
•
Creating the Journaled File Systems
•
Mounting and verifying the file systems
Creating scripts to configure all devices at once may 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 may need to change a few of those values for each new OPEN-x device: See
Table 4
and
Table
5
.
•
Read/write (R/W) timeout value
•
Queue depth
•
Queue type
Table 4 Device parameters-read/write timeout and queue type
Required Value
Default Value
Parameter
60
30
Read/write timeout
Installing and configuring AIX for the XP disk array
16