Shulou(Shulou.com)06/02 Report--

Q: how can I be sure that the machine will run a 64-bit kernel?

A: 64-bit hardware is required to run a 64-bit kernel. For AIX 5.2, all IBM eServer pSeries 64-bit hardware can run

64-bit or 32-bit kernel. The command is as follows:

# / usr/sbin/bootinfo-p

When running on a machine that can only run a 32-bit kernel, the string "32" is returned. If the machine can run within 64 bits

Kernel or 32-bit kernel, this command will return "chrp".

In AIX 5.2, the 32-bit kernel is installed by default. 64-bit kernel and JFS2 (enhanced journaling file system)

Can be enabled at installation time.

Q: can I use applications built on 32-bit or 64-bit kernels?

A: absolutely. The environment in which the application is built has nothing to do with where it can run. You can use the compiler switch to be used in the

Creates a 32-bit or 64-bit executable program from program source code when compiled on a 32-bit or 64-bit kernel. In addition, 32-bit programs and 64

Bit programs can be run on either a 32-bit or 64-bit kernel.

Q: can 32-bit applications run on 64-bit kernels?

A: almost certainly. The only time a 32-bit application cannot run on a 64-bit kernel is when the application needs to use only the

Kernel extensions available in 32-bit mode (programs that extend the kernel and may, for example, provide new system calls to applications

Program). An example of this scenario is Oracle 8i, which contains a kernel extension that enables only 32 bits. Oracle 9 does not have this

Class restrictions, which can be run on a 64-bit kernel. Applications generally do not provide extensions.

Q: do all I / O devices work on 32-bit or 64-bit kernels?

A: I / O devices without 64-bit kernel extensions will not be configured by 64-bit kernels. Almost everything that can work on a 32-bit kernel

All Icano devices can also work on 64-bit kernels.

Q: can I run JFS2 (enhanced journaling file system) on a 32-bit kernel?

A: although not recommended, JFS2 on 32-bit kernels is supported on AIX 5.2. Although JFS2 is the foundation of JFS

Important scalability improvements are provided on, but its full potential can only be realized through a 64-bit kernel. The 64-bit kernel provides more

A good environment for running JFS2, because the scaling potential of the 32-bit kernel is much limited. 64-bit kernel and JFS2's

Combinations are designed to achieve much better file system performance than any other combination of file systems and kernels. Recommend

Use JFS with a 32-bit kernel.

Q: to install AIX 5.1 with a new and complete rewrite and want to choose a 64-bit kernel. What should I do?

A: if your system has a 64-bit processor, the 64-bit kernel will be automatically installed with the base operating system. However, 64-bit

The initial kernel is enabled only if you set the 64-bit kernel and JFS2 option to Yes during the initial AIX installation.

To do this, go to the advanced option during the installation of AIX and select Yes for the 64-bit kernel. When you do this, set the

Use JFS2 (also known as the enhanced journaling file system).

Q: can I change it back to 32-bit after installation with 64-bit?

A: yes, you can change back to 32 by booting to the service and redirecting the symbolic link to unix to unix_mp (32-bit kernel)

Bit. Execute bosboot and reboot the partition.

64Mutual-> 32

# ln-sf / usr/lib/boot/unix_32 / unix

# ln-sf / usr/lib/boot/unix64 / usr/lib/boot/unix

# bosboot-ad / dev/ipldevice

# shutdown-r

32 murmurs-> 64

# ln-sf / usr/lib/boot/unix_64 / unix

# ln-sf / usr/lib/boot/unix64 / usr/lib/boot/unix

# bosboot-ad / dev/ipldevice

# shutdown-r

For the oracle video tutorial, please follow: http://u.youku.com/user_video/id_UMzAzMjkxMjE2.html

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