March 29th, 2009
What does fault-tolerant or high-availability really mean? Likewise, if a system says it has five nines of availability – what does that really mean?
|
System
Type
|
Downtime
per Year
|
Downtime
per Month
|
Downtime
per Week
|
Availability
|
Availability
Class
|
|
unmanaged
|
36.5 days
|
72 hours
|
16.8 hours
|
90.%
|
1 nine
|
|
managed
|
3.65 days
|
7.20 hours
|
1.68 hours
|
99.%
|
2 nines
|
|
well
managed
|
8.76 hours
|
43.2 mins
|
10.1 mins
|
99.9%
|
3 nines
|
|
fault
tolerant
|
52.6 mins
|
4.32 mins
|
1.01 mins
|
99.99%
|
4 nines
|
|
high
availability
|
5.26 mins
|
25.9 secs
|
6.05 secs
|
99.999%
|
5 nines
|
|
very high
availability
|
31.5 secs
|
2.59 secs
|
0.605 secs
|
99.9999%
|
6 nines
|
|
ultra
availability
|
3.1 secs
|
.25 secs
|
.06 secs
|
99.99999%
|
7 nines
|
References
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March 27th, 2009
After installing the latest version of UltraEdit and configuring it, I discovered that the Artistic Style source code formatter is built in and easily added.
From the Advanced > Configuration menu option …
Choose Toolbars / Menus > Customization and then select the Customize Toolbar button.
Scroll down on the left side until you find the Artistic Style toolbar item, then select it and click on left arrow to add it to the toolbar, and select OK.
The end result is a built in toolbar button for AStyle..
… which presents the formatting options dialog whenever you click on it.
Much easier than my original post!
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March 25th, 2009
Another great feature of UltraEdit is the ability to configure tools – program or commands that can be run from the menu or toolbar.
So here is how to configure the open source tool AStyle (Artistic Style) so that C C++ or Java code that looks like this
.. will be “beautified” in just about any format style, like this:
Download AStyle and save it where you want it. There is no install to run.
In UltraEdit, go into Advanced > Tool Configuration from the menu.
Configure the command to run the AStyle program passing it the style option(s) you want. Run AStyle.exe -h from a command prompt to see all the options.
In this example, we are using the following Command Line
“C:\Program Files\AStyleWin\AStyle.exe” –style=allman –quiet “%f”
Save your configuration (Apply and/or OK) and you will have AStyle available as a menu item for you to use.
When you select this tool from the menu (or use the short cut keys) AStyle will run against the current open file. To see the results of the beautification, make sure to choose Yes to reload when prompted.
References
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January 18th, 2008
Transaction Processing: Concepts and Techniques by Gray & Reuter is the definitive reference on transaction processing. The text book covers problems OLTP systems and discusses fault tolerance, recovery, monitoring, concurrence, scheduling, and file systems. Includes a section on Guardian 90 in the Transaction Processing section.
A great reference to have sitting on the bookshelf, my only regret is that I did not have an opportunity to have my copy signed by Jim..
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