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Operating Systems AIX TL upgradation for AIX machine. Need help Post 302779489 by MichaelFelt on Tuesday 12th of March 2013 06:04:33 PM
Old 03-12-2013
5300-00-00 is simply the first CD release. First time I saw it (with AIX 7.1 they ran as TL0 for quite a while). In the case of AIX 5300-00-00-0000 that was simply the first so-called gold code before it was actually available on the market. When it became GA there was also an extra CD with the first updates to bring it to ML01
(Note: did not use the terms TL or SP at that time)

And, as Bakunin mentioned, there is no benefit in doing the TL by TL. However, if you have a specific application requirement to be at TL6 - then you may want to test that. TL stands for Technology Level and there were some major changes at TL7 time (I believe that is what was parallel with AIX 6.1 release, just as AIX TL6 is parallel to AIX 7.1 TL0). In other words, there is some effort spent to simply migrating applications from a previous version of AIX to a newer version by back-porting.

Also interesting to remember: AIX 6.1 was going to be AIX 5.4. Only a few weeks before release of POWER6 hardware did they decide to change the major version number. AIX 7.1 was needed (in any case) to provide kernel support for more than 64 processors (i.e., 256 processors and 1024 logical CPU). For the larger part AIX functionality is uniform across specific TL pairs.

Hope this helps/clarifies AIX and updates/technology levels
 

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DH_SYSTEMD_START(1)						     Debhelper						       DH_SYSTEMD_START(1)

NAME
dh_systemd_start - start/stop/restart systemd unit files SYNOPSIS
dh_systemd_start [debhelperoptions] [--restart-after-upgrade] [--no-stop-on-upgrade] [unitfile...] DESCRIPTION
dh_systemd_start is a debhelper program that is responsible for starting/stopping or restarting systemd unit files in case no corresponding sysv init script is available. As with dh_installinit, the unit file is stopped before upgrades and started afterwards (unless --restart-after-upgrade is specified, in which case it will only be restarted after the upgrade). This logic is not used when there is a corresponding SysV init script because invoke-rc.d performs the stop/start/restart in that case. OPTIONS
--restart-after-upgrade Do not stop the unit file until after the package upgrade has been completed. This is the default behaviour in compat 10. In earlier compat levels the default was to stop the unit file in the prerm, and start it again in the postinst. This can be useful for daemons that should not have a possibly long downtime during upgrade. But you should make sure that the daemon will not get confused by the package being upgraded while it's running before using this option. --no-restart-after-upgrade Undo a previous --restart-after-upgrade (or the default of compat 10). If no other options are given, this will cause the service to be stopped in the prerm script and started again in the postinst script. -r, --no-stop-on-upgrade, --no-restart-on-upgrade Do not stop service on upgrade. --no-start Do not start the unit file after upgrades and after initial installation (the latter is only relevant for services without a corresponding init script). NOTES
Note that this command is not idempotent. dh_prep(1) should be called between invocations of this command (with the same arguments). Otherwise, it may cause multiple instances of the same text to be added to maintainer scripts. Note that dh_systemd_start should be run after dh_installinit so that it can detect corresponding SysV init scripts. The default sequence in dh does the right thing, this note is only relevant when you are calling dh_systemd_start manually. SEE ALSO
debhelper(7) AUTHORS
pkg-systemd-maintainers@lists.alioth.debian.org 11.1.6ubuntu2 2018-05-10 DH_SYSTEMD_START(1)
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