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Issue 228
November 04,
2009 |
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Dear Readers,
I am thrilled to announce that Larry Youngren, the Journaling and
High Availability Guru, will be presenting a new monthly column in this
Newsletter entitled Journal Insights. The focus of the column
will be on the technology of System i journaling, high availability and
related topics.
After more than 30 years of experience leading the design efforts for
System i database and journal support at IBM, Larry Youngren recently
retired from IBM and now lectures, writes, and consults on high
availability issues.
For 30 years, Larry served as a microcode designer for the lower
layers of the i5/OS operating system and frequently consulted with
customers regarding High Availability and Journal performance issues.
During his IBM career,he worked exclusively with the microcode, first
for the S/38 and then for the System i. He led the teams responsible for
Data Base, Commit, SMAPP, and Journal. His interests involve future
performance and recovery improvements affecting journaling and IPL
duration. He and the team he led have authored a popular IBM Redbook
entitled Striving for
Optimal Journal Performance, numerous magazine articles regarding
both Ragged SWA and Remote Journaling, plus over a dozen journal related
TECHNOTES which address popular journal questions. These TECHNOTES can
be accessed from IBM's redbooks
website.
You will find the first installment of Journal Insights in this
issue.
Cheers!
Dan
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Understanding Library Authorities
By
Dan Riehl
A popular misconception held by many people is that if
a library is secured as *PUBLIC AUT(*USE), then this library authority
provides Read-Only access to the files that reside in the library. For
most of use who read this newsletter, we know that this is not true.
Here are the rules for library authorities.
*EXCLUDE Authority
If a user has *EXCLUDE authority to a library, they cannot access the
library, nor can they access the objects within the library.
*USE Authority
If a user has *USE authority to a library, they can access the
library, but cannot change attributes of the library, such as the
library text. The user cannot add new objects to the library.
*Read
More...
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Checkup on your Library and Object
Authorities
By
Dan Riehl
In order to stay on top of your library authorities,
you need to check them once in a while. You may have tried to do this
with interactive commands like WRKOBJ and slog your way down each list
item to view the authorities, one library at a time. But, there is a
nice IBM supplied command to get a listing of all your library
authorities. This is the PRTPVTAUT(Print Private Authorities)
command.
The following command will print a list of all public and private
authorities for all libraries on your system.
PRTPVTAUT OBJTYPE(*LIB)
Here is a snippet of the printed report.
*Read
More...
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Journal
Insights: Library Journaling
By
Larry
Youngren
Originally, database files were the only object
eligible for journal protection and the matching Start Journal Physical
File (STRJRNPF) command was sufficient. As the years progressed,
keyed logical files (also known as Access Paths) were welcomed into the
fold and a matching Start Journal Access Path (STRJRNAP) command
showed up. More time passed, IBM's journal developers recognized that
critical information was no longer stored exclusively within the
database, and so additional objects such as data areas, data queues, and
even IFS files became journal eligible. However, in order to grant
journal protection to such objects, you had to name them one-by-one and
you had to take overt action to identify each such object and grant it
journal protection.
If you were lazy or sloppy, you could easily overlook an object and
suffer the consequence.
In the latest release (IBM i 6.1) a substantial new approach was
initiated along with a new command.
Do you know what it is?
*Read
More...
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Feeling insecure? Check out these three fantastic
security articles from the
October issue of System iNEWS:
Securely
Integrating Wireless: Learn Your Risks,
Find Your Holes, and Lock Out Interlopers - There is
no better way to make the six o'clock news than to leave your enterprise
WiFi open to attack. Alas, surveys reveal that more
than half of major enterprise WLANs remain exposed. Separate yourself
from the herd by employing the advice given here to lock interlopers out
of your corporate wireless network.
Living
with Network Access Control - Network Access Control,
as described in the 802.1x
standard, is now a well-understood technology. Vendors, as always, have
been pushing the envelope of NAC's originally envisioned mission,
adapting NAC to new Ethernet use cases. Learn how NAC
deals with these and what you can safely do to extend your own
NAC-protected network.
Security
Checklist for Your IBM i Compliance Audits - Here's
insight
into what auditors look for and what you can do to be prepared.
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