Configuring HP-UX For Peripherals

148 Chapter5
Configuring Disk Drives, Disk Arrays, and CD-ROM Drives
Planning to Configure into your System a Disk Already Containing
Data
Planning to Configure into your System a
Disk Already Containing Data
When configuring a new disk onto either Series 700 or 800 system, both
SAM and insf now treat the disk in its entirety and create a single block
device special file in /dev/dsk and a single character device special file
in /dev/rdsk. As of HP-UX 10.0, to apportion disk space on both Series
700 and 800 systems, use Logical Volume Manager (LVM), which is
documented in the Managing Systems and Workgroups manual.
Configuring a disk already containing data into HP-UX 10.0 requires
some attention to detail, because the I/O system is largely converged and
the HP-UX file system layout (that is, the locations of system files and
directories) has changed.
Approach the task in two stages:
1. Examine the files and data on the disk for possible clashes with the
HP-UX 10.0, and take the necessary precautions, as documented in
“Ensuring Against Clashes with HP-UX 10.0”, the next section.
2. Configure the disk into HP 10.0.
Once 9. x Series 700 whole disks and Series 800 disks with hard
partitions are successfully configured, HP-UX 10.0 accesses their data
using a compatibility pseudo-driver (cpd).
Ensuring Against Clashes with HP-UX 10.0
Before you configure a disk containing 9. x data to a 10.0 system, it is
essential that you make sure you will not be introducing file-system
inconsistencies. This precaution is necessary because the file-system
layout has changed dramatically from HP-UX 9. x to 10.0. Former system
files and device files will not work in the new operating system and
might cause serious problems if they are used.
The new file-system hierarchy is based on AT&T V.4 and OSF/1. The
organization of files and directories are explained in a white paper
entitled HP-UX 10.0 File System Layout.
To ensure against incompatibilities with HP-UX 10.0:
Step 1. Examine the files on the 9. x disk to make absolutely sure you do not