2,278 reputation
1222
bio website karlkatzke.com
location College Station, TX
age 34
visits member for 5 years, 6 months
seen Mar 18 at 0:52

I'm a sysadmin for Sentry Data Systems. I do linux and clustering and networking, and enjoy instigating a good STONITH deathmatch when I get bored.

Work-wise, I'm a giant fan of the k.I.s.s. principle - keep I.T. simple, stupid. Don't make things any more complex than the features you need.

In my spare time, I renovate houses and ride herd on a pack of dogs with extreme mental issues. My background and career are both in systems. I look at systems, analyze them, and use them or make them better. I likeCFO DIY home stuff because the systems are simple and it's rewarding to figure em out and use them. How do I know the things I do? I have probably been there, broken that, ruined the other thing, and had to figure out how to fix all of them. we have this saying in my group of friends-who-renovate-houses: "Ask me how I know."


Aug
17
comment RAID and Databases
NAND Flash 101: You have a 20k block of 5 pages 4k in size. You write something to the first 4k page, then something to the next two 4k pages, and then you delete the information in the 4k page. The OS marks it as deleted, but the controller doesn't delete it -- NAND Flash can only delete entire blocks, not individual pages. Now let's say you want to write a 12k file to that block. The 8k you'll keep needs to get read into cache, then the block gets deleted, then all 20k gets written. From the OS's POV, 12k got written. From the NAND controller, 26k, doubling the time it took.
Aug
17
comment What prevents loops in mysql master-master setups?
Unrelated to your question: You really need to look up Maatkit. It'll explain some of the internals. Also, I found MySQL-proxy to be helpful in getting this kind of setup profiled properly.
Aug
17
answered Data center equipment vendors?
Aug
17
answered Can you break down relative MySQL load by “source” of query?
Aug
17
comment Where are the repos with development tools for SUSE (SLED 11)?
motus, everyone's got different priorities. In SLED's case, it's to be a user-friendly desktop for your average office worker in a large environment. Since your average office worker doesn't need development packages, they put them on a separate CD -- in an organization like mine that's deploying it, we'd have that 'add-on' available on the network anyway as a repository. Different strokes for different folks! X/Ubuntu does what you're expecting, SLES does what a Novell/Windows admin would be expecting.
Aug
17
comment RAID and Databases
On large arrays, I've seen RAID5/6 be larger than RAID10. The controller can read as fast as it can assemble the data into a coherent stream because one of the disks' head will always be close to the location of the data that's needed.
Aug
17
comment RAID and Databases
Why would you put raid5 over raid6? And why raid 0 over raid5/6? Backwards.
Aug
17
answered RAID and Databases
Aug
17
answered NFS exporting a directory that's already NFS mounted (on the server)
Aug
17
revised Best floor of a tall building to locate your server room or data center
edited tags
Aug
17
revised Where are the repos with development tools for SUSE (SLED 11)?
You can add sled/sles11 packages from the bulid service safely.
Aug
16
comment Automated “yum update” to keep server secure - pros and cons?
I consider 0-day to be the day it is discovered/exploited/announced, and Redhat usually patches severe vulnerabilities within a few hours -- which is, coincidentally, still during the day it was discovered.
Aug
16
answered Enough RAM to run multiple Wordpress sites
Aug
16
answered Automated “yum update” to keep server secure - pros and cons?
Aug
16
answered formalizing centralized web hosting in a University setting
Aug
16
revised Best virtualization server core
edited tags
Aug
16
comment Best virtualization server core
For desktop or server use?
Aug
16
answered Where are the repos with development tools for SUSE (SLED 11)?
Aug
16
comment How to set up Cobbler with Puppet or Cfengine?
Our deal-killer with puppet is the lack of a zypper interface. I don't have the time to sit down and learn ruby in order to develop one and provide tests against it, even if it'd be in my long-term best interest.
Aug
11
answered Any decent open source link/directory managers out there?