This is an attempt to respond to several questions in forks of the
thread rooted in this e-mail. Look for [KSB2] below. On 02/06/2014 09:42 PM (US Eastern
Time), Bhaskar, K.S wrote:
[KSB2] <...snip...>
[KSB2] GT.M users often have multiple GT.M releases installed on their systems. Here is a representative example: A system hosts the systems of record for the medical records of both Clinic A and Clinic B. Clinic A uses release 1 of GT.M, whereas Clinic B uses release 2 of GT.M (perhaps because Clinic B came online later and used the latest release of GT.M then available, whereas Clinic A never upgraded). Release 3 becomes available and has new functionality that both clinics want. Here is an upgrade scenario:
As there is not a reliable way to automatically ensure that a GT.M release is no longer in use, we strongly recommend that a new GT.M release always be installed in a new directory. This is analogous to the Linux kernel, where a new kernel is never installed on top of an old kernel: once the new kernel is booted, the old kernel can be removed. In the case of GT.M, even a reboot does not guarantee that a prior release is no longer needed because a database may have been shutdown cleanly, and will require a utility program from the release it was opened with to run it down (this is part of the protection to prevent a database file from being concurrently opened by multiple nodes). Because bugs in GT.M are very infrequently encountered in production, upgrades are rare, and usually only when people want to use new functionality (since GT.M is under active development, there is new functionality released frequently). So, sites would never pin GT.M releases. Apropos the hard links issues, they are legitimate. The hard links are security related hard-links between a sub-directory and a parent directory. The subdirectory is created as part of the GT.M installation and is thus never on a different filesystem. Please do not replace them with soft-links, and instead flag them as legitimate. I think I have responded to all the points raised. If I missed any, please let me know. Thank you. Regards -- Bhaskar -- GT.M - Rock solid. Lightning fast. Secure. No compromises.
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