OK, so I've setup a RAID5 at home because I'm getting tired of failed disk drives and data losses.
Some stats from bonnie++ if anybody cares:
Version 1.03 ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP bonsai 2G 26727 72 39426 19 16690 7 28725 65 34164 7 215.3 0 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ bonsai,2G,26727,72,39426,19,16690,7,28725,65,34164,7,215.3,0,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
(Now, if I only knew what all those figures mean ;-)
No, neither the software RAID5, nor the dm-crypt layer nor LVM cause any measurable performance degradation whatsoever (from my subjective feeling). I don't care enough to measure anything. The CPU is idling all the time.
Power consumption is rather high (partly due to the mainboard and CPU, but also because of the disks + fans) and the system is pretty loud, which both sucks on the long run. I plan an ultra-silent, ultra-low-power RAID5 with 2.5" disks attached via USB to a (silent, low-power) NSLU2 for later.
Highly recommended for anybody who might be even remotely interested in LinuxBIOS:
The talk is about LinuxBIOS, its history, how it works, what the main challenges are, where it's used today and what the future will likely hold. Watch it, you won't regret it.
Interesting paper from the PacSec 2006 security conference: OpenOffice / OpenDocument and MS Office 2007 / Open XML security (PDF)
Not too surprising when you come to think of it, there are tons of possibilities to embed various kinds of malware in the new office document formats. Also, you always have the risk of leaving sensitive metadata in there... If you publish stuff, you better convert to PDF before. But even that might leave sensitive data in the PDF, mind you!
Oh, and one nice detail you might enjoy:
And that doesn't even describe all of the format (e.g. VBA macros are missing)! No further comment required...
You should really upgrade ASAP, as this problem can (theoretically) occur when GnuPG decrypts/checks encrypted email messages/signatures (for example).
If you're running Debian unstable:
apt-get install gnupg
Here's a nice list of Famous Unsolved Codes and Ciphers.
Makes an interesting read for a rainy day... Or if you want to give one of the codes a try and solve it, go ahead, and let us know the results :-)