Hub/Switch Installation Guide

Chapter 2 HPSS Planning
74 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
6. Now, rebuild the kernel configuration by running the "make config" command and
answering "yes"whenquestionedaboutAIO support.The defaultvalue of4096 shouldbe
sufficient for the number of system-wide AIO requests.
At this time, you should also configure the kernel to support your disk or tape devices. If
tape device access is required, be sure to also enable the kernel for SCSI tape support. See
the following section for information on device support on the Linux platform.
Notethat theLinuxkernelconfigurationvariblesthatcontrolthe KAIOfacility areCONFIG_AIO
and CONFIG_AIO_MAX.
7. Follow your procedure for rebuilding your Linux kernel. For example:
% make dep
% make bzImage
8. Copythenew kernelimage totheboot directory, updatethelilo configuration,and recycle
the system. For example:
% cd /boot
% cp /usr/src/linux-2.4.18/arch/i386/boot/bzImage vmlinux-2.4.18
% vi /etc/lilo.conf
% /sbin/lilo
% shutdown -Fr 0
9. IfyouneedtorebuildtheHPSSMover,makealinkfrom/usr/src/linux/include/linux/aio.h
to /usr/include/linux/aio.h. For example:
% cd /usr/include/linux
% ln -s /usr/src/linux-2.4.18/include/linux/aio.h
2.6.10.2 Tape Devices
2.6.10.2.1 AIX
Alltapedevicesthat willbe used forHPSSdata mustbe set tohandlevariableblock sizes(to allow
for the ANSI standard 80-byte volume label and file section headers).
To set the devices to use variable blocks on an AIX platform, either use the chdev command
(substituting the appropriate device name for rmt0 - also take into accounts differences in the
interface based on the specific device driver supporting the device):
chdev -l rmt0 -a block_size=0
or smitty:
smitty tape
<select “Change / Show Characteristics of a Tape Drive”>
<select the appropriate tape device>
<change “BLOCK size (0=variable length)” to “0”>
<enter>