Updated: 7/18/2002; 6:07:09 AM.

So many islands, so little time
Living in Indonesia and learning to Weblog via Radio (along with many other very random thoughts and stories).




daily link  Thursday, June 27, 2002

Taking the Linux plunge

Okay, I'm diving into Linux. I've got a new desktop coming and I'm going to set it up for dual boot with Linux and Windows. I've found some info on setting up the dual boot, but any suggestions are welcome. More importantly which version (distribution) of Linux should I use? This is very confusing for the newbie. I take it that most folks in Indonesia use RedHat, but I've been told the install procedure isn't too friendly. So, do I go with Corel, Mandrake, or something else? Are the desktop UI different on all of these? So many questions.

11:33:33 AM  permalink   

Uptime/Downtime

Understanding "5 9s"

The term 5 9s is really, really simple but misleading if you never saw the math.  All it means (and if I have this wrong, I know someone will let me know) is that if your service, whatever it is, is "5 9s" then it's online and usable for 99.999% of the year.  So I made a little spreadsheet that looks at a full year's time and what this means in terms of uptime.

# 9s %age that Means Days Per Year Hours Per Year %of that Time You are Up in Hours Amount of Time You Are Down in Hours Time You Are Down in Days Time You Are Down in Minutes
2 9s 99.0000% 365 9125 9034 91.2500 3.8021 5475
3 9s 99.9000% 365 9125 9116 9.1250 0.3802 547.5
4 9s 99.9900% 365 9125 9124 0.9125 0.0380 54.75
5 9s 99.9990% 365 9125 9125 0.0912 0.0038 5.475
6 9s 99.9999% 365 9125 9125 0.0091 0.0004 0.5475

So if you are only 99% reliable that actually is exactly the same thing as saying "Mr. CEO Sir?  We're going to turn the web site off for 3.8 days".  That's not a good thing.  I know that my stuff will probably never by 5 9s but why not try?  Quality.  It's a good thing.  [The FuzzyBlog!]

This is pretty powerful stuff from Mr. Fuzzy. So, what's acceptable for my purposes? Some where after 2 9s. Over the course of a year somewhere between 1 hour and 1 day.

7:42:37 AM  permalink   


 
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Copyright 2002 © Joe Friend.
Last update: 7/18/2002; 6:07:09 AM.

Comments by: YACCS