Here's an interesting blog post by Peteris Krumins which explains why the vi(1) text editor inventor, Bill Joy, chose to use the HJKL keys as arrow keys in his software. And thus why we still use them today.
David
Sunday, March 11, 2012
Sunday, February 12, 2012
OT : very nice earth images from the international space station
Off Topic!
This Flikr stream is from an Italian astronaut which photographed our planet from the international space station (ISS). Enjoy magisstra's photostream !
David
This Flikr stream is from an Italian astronaut which photographed our planet from the international space station (ISS). Enjoy magisstra's photostream !
David
Visio Stencils Collection
Many of us rely on Microsoft© Visio in our daily work as systems administrators and architects. To create elaborate and good looking Visio documents, one relies on Visio Stencils. Finding the right stencil can be problematic. This is the reason of this blog post : to help others find good stencils. Here's my list of favorite websites which offer Visio stencils for free...
- Solutions to Technology : one of the most complete set of stencils I've ever found.
- Cisco Visio Stencils : Cisco© stencils directly from the manufacturer.
- SonicWall Visio Stencils : if you happen to work with SonicWall products, that's what you need.
- Jean Dion Visio Stencils : a good place for Sun Microsystems stencils.
David
Monday, September 19, 2011
MacOS X 10.7 Time Machine Backup to FreeBSD Server with Netatalk
UPDATE : This documentation still works, but it uses netatalk version 2 and is more complex than using version 3. Please consider using this documentation using netatalk version 3 instead.
If you backup your MacOS X 10.6 machine to a netatalk server, then you may have found that MacOS X 10.7 cannot backup to the same machine. Apparently, the major reason why it's now broken is a lack of « replay cache » which was introduced in AFP 3.3. So what you need to do is upgrade netatalk to version 2.2.x.
UPDATE : I've successfully this setup with MacOS X 10.8 and 10.9.
Let's configure a FreeBSD machine to serve as a Time Machine target for MacOS X 10.7. I'm using FreeBSD 8.2 as this is the production version. If you prefer using a Linux machine, then take a look at this blog post by Steffen L. Norgren.
If you backup your MacOS X 10.6 machine to a netatalk server, then you may have found that MacOS X 10.7 cannot backup to the same machine. Apparently, the major reason why it's now broken is a lack of « replay cache » which was introduced in AFP 3.3. So what you need to do is upgrade netatalk to version 2.2.x.
UPDATE : I've successfully this setup with MacOS X 10.8 and 10.9.
Let's configure a FreeBSD machine to serve as a Time Machine target for MacOS X 10.7. I'm using FreeBSD 8.2 as this is the production version. If you prefer using a Linux machine, then take a look at this blog post by Steffen L. Norgren.
Friday, June 24, 2011
The Origin of the word Daemon
Here's an interesting short article on the origin of the word « daemon ». I've copied the entire article below. Enjoy!
Monday, March 21, 2011
How to increase ASM disk space on Linux with iSCSI using udev instead of ASMLib.
Today I'd like to explain how to add more disk space on an existing Oracle ASM diskgroup on Linux using udev(7) instead of ASMLib.
There has been a few threads about ASM, AMSLib and udev on the oracle-l mailing list (see OCR / VD external vs. normal redundancy using NFS and High Availability Options for instance). I prefer using udev. So in this example, I will be using udev in order to add two new LUNs to the existing +FRA ASM diskgroup.
This particular ASM setup has three diskgroups: +CRS, +DATA and +FRA. The +CRS diskgroup is used for the Grid Infrastructure (GI) files (i.e. OCR and ASM spfile), the +DATA is used for the database (RDBMS) data files while the +FRA one is the Fast Recovery Area. That's the one we need to increase.
There has been a few threads about ASM, AMSLib and udev on the oracle-l mailing list (see OCR / VD external vs. normal redundancy using NFS and High Availability Options for instance). I prefer using udev. So in this example, I will be using udev in order to add two new LUNs to the existing +FRA ASM diskgroup.
This particular ASM setup has three diskgroups: +CRS, +DATA and +FRA. The +CRS diskgroup is used for the Grid Infrastructure (GI) files (i.e. OCR and ASM spfile), the +DATA is used for the database (RDBMS) data files while the +FRA one is the Fast Recovery Area. That's the one we need to increase.
What to look out for when changing old servers.
Last week I replied to a post from Marko Sutic on the oracle-l mailing list (Here's the thread on the mailing list archives). Apperently it was worth it as he wrote back saying « I'm astonished with the quality of your reply! » (thanks Marco, it's a good ego booster! :)
He suggested that this post should be shared because it can be useful to many people. And not just as an Oracle specific issue. He also asked if he could post it on his blog. Not a bad idea, I thought. So here it is. But first, let's see Marco's original question:
He suggested that this post should be shared because it can be useful to many people. And not just as an Oracle specific issue. He also asked if he could post it on his blog. Not a bad idea, I thought. So here it is. But first, let's see Marco's original question:
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