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comp.unix.aix Frequently Asked Questions (Part 1 of 5)
Section - 1.128: AIX fix strategy

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Top Document: comp.unix.aix Frequently Asked Questions (Part 1 of 5)
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First, a little history...

The maintenance strategy for AIX 3.1 was cumulative updates. Every few
months, we'd put all available fixes in one large package and ship it. 
There was no real strategy for providing a single fix. Although we'd
occasionally produce an emergency patch, there was no method for
tracking them; if you got a second one, it might overwrite the first. 
So, after a few of these patches, it's hard to track.

In AIX 3.2 we introduced a "selective fix" strategy to support
individual fixes. The package contained information about other fixes
that were required for that fix to work correctly. For example, a Korn
shell fix might require a change in libc.a, which might in turn require
a fix in the kernel. This strategy allowed us to keep track of which
fixes were installed to make sure we didn't overwrite one with another,
and make sure they all worked together. But the initial selective fix
design still had a few problems.

  o None of the fixes were cumulative.  If you got a fix for Korn shell,
    you may not receive all of the fixes for Korn shell.  This left the
    possibility of rediscovering other problems that were already fixed.

  o Since we chose to fix everything possible that was reported as a
    problem, instead of deferring them to the next release, the number
    of available fixes became quite large.

  o The number of additional fixes required by any given fix could also
    be quite large.  Since the installation program ran once for each
    fix, the size and complexity of the fix packages grew, and
    installation time lengthens greatly.

While developing the AIX 3.2.4 upgrade, we undertook a large effort to
resolve the selective fix concerns, and dramatically increase the
quality of AIX 3.2.  The base operating system and most of the optional
program products were split into subsystems.  A subsystem is a group of
logically related files.  The division was made such that changes to a
given subsystem were less likely to affect other subsystems.  In total
there are approximately 500 subsystems, but in practice, files have been
modified in only about half of them.  The advantages of the new
packaging strategy are:

  o Each subsystem package is cumulative, containing all of the fixes
    and enhancements to date for that subsystem.

  o The cumulative subsystem package is tested as an entity.

  o The number of fix packages is greatly reduced because the number of
    subsystems is far fewer than the number of fixes and enhancements.

  o The number of other fixes required by any given fix is also greatly
    reduced because a subsystem package has requisites only on other
    subsystem packages.

  o The reduced number of fix packages greatly reduced installation time.

Some customers also told us that they liked the maintenance level
strategy that we used in AIX 3.1.  They liked being able to install all
of the known fixes, and they liked knowing what "level" of AIX they had. 
To meet these requirements, we produced a Preventive Maintenance Package
(PMP).  The PMP is simply a collection of the latest cumulative
subsystem packages tied together in such a way that it can be installed
by selecting a single fix.  We also added flags to the lslpp command and
added a new command, oslevel, to show which PMP is installed.  Now we
had both! The good attributes of selective fix along with the good
attributes of maintenance levels. 

A few Q&As: 

Q. Why is the fix I just received 130 megabytes!@#? I already have the
AIX 3.2.4 update installed!
A. Your fix may be part of the AIX 3.2.5 update. AIX 3.2.5 is another
PMP that contains all of the fixes to date, as well as enhancements 
to support the PowerPC model 250, and the new high-end RS/2 models
590 and 990, as well as support for new disk and tape drives, graphics
adapters and more.

Q. Why can't you just build my fix on 3.2.4? 
A. There really isn't such a thing as 3.2.1 or 3.2.2 or even 3.2.4. 
They're just collections of fixes and enhancements built on a 3.2 base. 
If the fix for your problem was built prior to 3.2.5, you can get the
older version. But if your fix was built for the first time in a 3.2.5
subsystem, that's the only version of the fix that exists.

See also 6.02.

User Contributions:

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Oct 22, 2019 @ 2:02 am
But remnants' crop burning hits harvesting hard

This sunday, quite possibly 28, 2019 snapshot, Provided by the city service group, jointly for Jarniyah, contains been authenticated based on its contents and other AP reporting, Shows Syrians lifetime extinguish a fire in a field of crops, wearing Jaabar, Raqqa state, Syria. Thousands of acres of wheat and barley fields in both Syria and Iraq have been scorched by the fires within harvest season, that typically runs until mid June. "The life that we live here is already bitter, " stated Hussain Attiya, A farmer from Topzawa Kakayi in upper Iraq. "If the outcome continues like this, I would say that no one will continue to be here. I plant 500 to 600 acres on a yearly basis. still, I won't be able to do that because I can't stay here and guard the land day and night. "ISIS militants have a history of working with a "Scorched earth insurance coverage " In areas from that they can retreat or where they are defeated. Ahmed al Hashloum thoughts Inmaa, Arabic for benefits, A local civil group that supports farming. all it takes is a cigarette butt to set haystacks on fire, He brought up. Said the fires are threatening to disrupt normal food production cycles and potentially reduce food to protect months to come. The crop burning remains localized and can't be compared to pre war devastation, Beals considered that. "suffice to say, It is only the beginning of the summer and if the fires continue it could lead to a crisis, " Beals recounted,AlternativeHeadline,prepared crop burning blamed on ISIS remnants compounds misery in war torn Iraq and Syria"}

But good news is short lived in this part of the world, Where residents of the two countries struggle to face seemingly never ending violence and turmoil amid Syria's civil war and attacks by remnants of the Islamic State of Iraq and Syria (ISIS) social groups. of course, Even in locations where conflict has subsided, Fires currently raging in farmers' fields, depriving them of valuable crops.

The blazes have been blamed also consider on defeated ISIS militants seeking to avenge their losses, Or on Syrian regime forces battling to rout other armed groups. Thousands of acres of wheat and barley fields in both Syria and Iraq have been scorched by the fires within harvest season, what kind runs until mid June.

ISIS militants have a history of implementing a "Scorched earth guideline" In areas from which retreat or where they are defeated. this "A means of inflicting a collective punishment on those put aside, said Emma Beals, a completely independent Syria researcher.

ISIS militants claimed obligations for burning crops in their weekly newsletter, al Nabaa, Saying they targeted farms owned by senior officials in six Iraqi provinces and in Kurdish administered eastern Syria, sending the persistent threat from the group even after its territorial defeat.

ISIS said it burned the farms of "The apostates in Iraq together with the Levant" And required more.

"It seems that it'll be a hot summer that will burn the pockets of the apostates as well as their hearts as they burned the Muslims and their homes in the past years, this great article said.

countless acres of wheat fields around Kirkuk in northern Iraq were set on fire. Several wheat fields in the Daquq district in southern Kirkuk burned for three days straight yesterday.

In eastern Syria's Raqqa state, Farmers battled raging fires with items of cloth, bags and water trucks. Piles of hay burned and black smoke billowed above the job areas.

The Syrian Observatory for Human Rights said through 74,000 acres (30,000 hectares) linked farmland in Hassakeh, Raqqa and completely to Aleppo province to the west, Were scorched.

Activist Omar Abou Layla said local Kurdish led forces failed to react to the fires in the province of Deir el Zour, Where ISIS was uprooted from its last property in March, (...)

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Top Document: comp.unix.aix Frequently Asked Questions (Part 1 of 5)
Previous Document: 1.127: Updating to 3.2.5
Next Document: 1.129: Are passwords limited to 8 char?

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