HP-UX JFS 3.3 migration impact

[Amith_2]

One of our client is migrating to HP-UX JFS3.3 file system. HP has advised him that if there are any application programs that are kernel intrusive then those programs might need to recompiled.

I would like to know what is meant by kernel intrusive programs.And also whether we need to recompile the application programs for that. Our programs are at present compiled on HFS and works fine with JFS3.1

[Steven E. Protter]

Shalom,

I've done the upgrade on oracle database/application servers.

No impact.

Just need to do an Ignite make_tape_recovery or make_net_recovery backups in case your system is rendered unbootable by the patch.

SEP

[Amith_2]

Thanks Steven..

Could you please tell me what it means by a kernel intrusive program. Is it something which changes the kernel values etc ..

Many Thanks
Amith

[Bill Hassell]

Kernel intrusive defines a program which either reads internal information, uses undocumented or unsupported interfaces to the kernel (or subsystems), or otherwise references internal data within the kernel. There is no way for a sysadmin to know if these (very unportable and very unstable) techniques have been used in a program.

The good news is that mainstream programs that are stated support for current revisions of the OS are fine. It would be very unusual (and questionable design) for a program to poke into VxFS filesystem code. A possible program that might poke around the filesystem code (this is specific to JFS/VxFS) would be an obscure backup program.

About all you can do (as is true with ANY production environment) is to use a sandbox (test) machine to evaluate the migration. This of course requires a detailed test plan to look at as many aspects of the application programs as possible, from patch and update to daily activities and backup processes.

[Amith_2]

Thanks for that update ...