HP StorageWorks XP Disk Array Configuration Guide (T5278-96047, May 2011)

6. Create the device files for all disk array devices (SCSI disk and multiplatform devices) using
the mknodcommand. Create the block-type device files in the /dev/dsk directory and the
character-type device files in the /dev/rdsk directory.
Example
# cd /dev/dsk Go to /dev/dsk directory.
# mknod /dev/dsk/c2t6d0 b 31 0x026000 Create block-type file.
File name, b=block-type,
31=major #, 0x026000= minor #
# cd /dev/rdsk Go to /dev/rdsk directory.
# mknod /dev/rdsk/c2t6d0 c 188 0x026000 Create character-type file.
File name, c=character-type,
177=major #, 0x026000=minor #
:
#
The character-type device file is required for volumes used as raw devices (for example,
3390-3A/B/C). The block-type device file is not required for volumes used as raw devices.
If you need to delete a device file, use the rm –i command.
Table 4 Device information example (HP-UX)
Major
no.
block
files
Major
no.
char.
files
Minor no.Dev fileLUNTIDDev typeDriverHW pathDiskInstBus
311880x026000c2t6d006OPEN-9sdisk8/12.8.8.255.0.6.03028/12
311880x026100c2t6d116OPEN-9sdisk8/12.8.8.255.0.6.14028/12
311880x028000c2t8d0083390-3Bsdisk8/12.8.8.255.0.8.05028/12
Creating the physical volumes
A physical volume must be created for each new SCSI disk device.
To create the physical volumes:
1. Use the pvcreate command to create the physical volumes with the character-type device
file as the argument. Specify the /dev/rdsk directory.
Example
# pvcreate /dev/rdsk/c6t0d0
Physical volume "/dev/rdsk/c6t0d0" has been successfully created.
:
# pvcreate /dev/rdsk/c6t0d1
Physical volume "/dev/rdsk/c6t0d1" has been successfully created.
Do not use the –f option with the pvcreate command. This option creates a new physical
volume forcibly and overwrites the existing volume. If you accidentally enter the character-type
device file for an existing volume, you will lose the data on that volume.
2. Repeat step 1 for each OPEN-x device on the disk array.
Creating new volume groups
You must create new volume groups for the new physical volumes. If desired, you can also add
any of the volumes on the disk array to existing volume groups using the vgextend command.
Configuring disk array devices 23