Diagram The Disk Layout; Plan Shared File Systems - IBM Hub/Switch Installation Manual

Appendix G High Availability
% bootlist -m normal hdisk0 hdisk1
% shutdown -Fr
Note that the last step reboots the machine. This is necessary to disable the normal quorum
checking for rootvg.
G.3.3

Diagram the Disk Layout

One key aspect to setting up your disks, volume groups, logical volumes, and file systems properly
is knowing which disks to use. This is easiest if you draw a diagram to plan out your volume
groups. To make sure your drawing is correct, it is important to know what bus the disks are on.
Use the lsdev -Cc disk command, and you will get output similar to the following (for SCSI):
% lsdev -Cc disk
...
hdisk2
hdisk3
...
hdisk11
hdisk12
...
Use the lsdev -Cc adapter command, and you will get something like:
% lsdev -Cc adapter
...
scsi3
scsi4
scsi5
scsi6
...
By comparing the third column in both outputs, it can be determined that hdisk2 and hdisk3 have
SCSI IDs 0 and 1 respectively on the bus attached to scsi3 and that hdisk11 and hdisk12 have SCSI
IDs 0 and 1 respectively on the bus attached to scsi5. Therefore, you would most likely want to have
hdisk2 mirror hdisk11 and hdisk3 mirror hdisk12.
G.3.4

Plan Shared File Systems

Before creating your diagram, take note that file systems supporting DCE, Encina SFS, HPSS,
Sammi, and Java must reside on shared disks. Other site-specific file systems may also need to
reside on shared disks in order to ensure that they are available to HPSS regardless of which node
is active. The default list of shared file systems to support the above mentioned components are:
• /krb5
• /var/dce
• /etc/dce
• /opt/encinalocal
546
Available 20-58-00-0,0SCSI Disk Drive
Available 20-58-00-1,0SCSI Disk Drive
Available 20-60-00-0,0SCSI Disk Drive
Available 20-60-00-1,0SCSI Disk Drive
Available 20-58
Available 20-59
Available 20-60
Available 20-61
September 2002
SCSI Controller
SCSI Controller
SCSI Controller
SCSI Controller
HPSS Installation Guide
Release 4.5, Revision 2