Tag Archive for 'MTTR'

Mean time between failures

Published
by
Malgent
on July 21, 2008
in Hardware and Reference
. 0 Comments

Mean time between failures (MTBF) is the mean (average) time between failures of a system, and is often attributed to the “useful life” of the device i.e. not including ‘infant mortality’ or ‘end of life’ if the device is not repairable. Calculations of MTBF assume that a system is “renewed”, i.e. fixed, after each failure, and then returned to service immediately after failure. The average time between failing and being returned to service is termed mean down time (MDT) or mean time to repair (MTTR).

It's just a matter of time.

It's just a matter of time.

Mathematically, the MTBF is the sum of the MTTF (mean time to failure) and MTTR (mean time to repair). The MTTF is simply the reciprocal of the failure rate, Continue reading ‘Mean time between failures’

Having a bad drive day

Published
by
Malgent
on July 21, 2008
in flickr
. 0 Comments


Having a bad drive day

Originally uploaded by Malagent

As a technician, system administrator and all around super geek, I have told others over and over again to back up their data. Sometimes my own advice is a bit hard to follow, ya know how it is - you get busy looking through Flickr, debating politics or whatever and the next thing you know. ZAP, just like that, all your really important irreplaceable data that you just happen to need right now is gone.

This normally would not be an issue for me, but this drive is not usually on my Mac protected by the Leopard’s Time Machine. This drive comes from a Windows 2003 Server from my little data center. At least the Mac is letting me copy the data whereas Windows just freaks out and goes into a BSOD spewing tantrum.

So there they sit, billions and billions of useless ones and zeros doing nothing but making me mad.

So I’m off to wait on 280GB of data to copy (I wonder how long I’m gonna waste burning 64 DVDs?) so I can rip this damn drive out and smash it to pieces with a hammer. Then I will kick myself a few times for failing to practice what I preach. Oh, and don’t forget to back up your data, you never know when you are going to learn the meanings of MTBF, MDT, and MTTR.