Unix-to-Linux migrations: Guidelines, distro choices and hardware optimization

Consider using POSIX-compliant distributions, like Red Hat and SUSE, to ease migration from POSIX-compliant Unix versions such as AIX, HP-UX and Solaris, says Michael Palmer. Palmer, the co-author of Guide to UNIX Using Linux, Third Edition (Course Technology), states that Red Hat and SUSE can be simpler to use because of their strong support.

Get comprehensive, step-by-step advice for your Unix-to-Linux migration testing environment and hardware optimization tips in this interview.

Which distribution has the easiest Unix-to-Linux migration path, and why? How much does distribution choice count when making a migration?

Michael Palmer: In general, it is easiest to move from POSIX-compliant versions of Unix to Linux, which is POSIX-compliant. For example, IBM AIX, HP-UX and Solaris are POSIX-compliant, commercial versions of Unix. Red Hat Enterprise Linux (RHEL) and SUSE Linux use a standard Linux kernel that is POSIX-compliant.

Migrating to RHEL or SUSE Linux also can be easier, because these distributions have a large client base with strong support from Red Hat, Novell and IBM. For instance, Novell and IBM offer the Migration Kit for Solaris OS to Linux.

It is important to recognize that problems will arise in any migration. By selecting Red Hat Enterprise Linux or SUSE Linux, there are likely to be people who have already solved the particular problems an organization encounters.

Does hardware optimization differ much for Unix vs. Linux? Would shops need to upgrade hardware in conjunc

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tion with a migration?

Palmer: Hardware optimization depends on several factors. One factor is the use of X Window and a desktop. Another is the use of GUI open source software.

Consider a legacy Unix system that is configured to run entirely from the command line. The legacy system might run very comfortably on a slower processor, such as a Pentium II computer. In a migration to Linux, the user may decide to implement X Window, GNOME and open source programs such as the OpenOffice.org office suite.

In this context, a hardware upgrade is needed. The new configuration requires a fast processor and more memory. It might be possible to run on the old machine, but the response would be painfully slow.

Linux distributions evolve into new releases as often as two or more times a year. Each new release incorporates more features to take advantage of new hardware and software options.

In some situations, each new release comes with more software, more utilities and the latest version of a desktop, such as GNOME or KDE. Distribution CDs have grown from one CD to multiple CDs. For these reasons, an older computer may not have a fast enough processor, enough RAM or disk storage -- or a combination of these.

What are some guidelines for migrating to Linux from Unix?

Palmer: A migration involves tasks that are similar to performing a major operating system upgrade. Migration guidelines include:

What did you think? Would you or have you done a migration to Linux from Unix? Email us and let us know.

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