Measuring Disk Usage In Linux (%iowait vs IOPS)

This occurred to me when looking at our Hadoop servers today, lots of our devs use IOWait as an indicator of IO performance but there are better measures. IOWait is a CPU metric, measuring the percent of time the CPU is idle, but waiting for an I/O to »

2010 Retrospective

Well, 2010 was a great year - thanks to all the great people who made it so. Just a brief outline: Work: Started the year down in Kent working on a XenApp deployment on VMware at the beginning of the year, then over in Dubai building a VMware View solution »

Donating To Wikipedia

I realised when auditing my delicious bookmarks recently how much I rely on Wikipedia to look things up and today donated for the first time. I had previously moaned about seeing Jimmy Wales’s face every time I logged in, like this and laughed my »

Load Based Nic Teaming vs Link Aggregation

I remembered seeing Simon Long’s comment on twitter a few weeks ago and it was rattling around in the back of my mind. Will #VMware Load-Based Teaming remove the need for #Cisco EtherChannel? Discuss…. I long ago investigated NIC Teaming algorithms »

Hyper9 Saves The Day

We recently bought the Hyper9 capacity planning, reporting and monitoring solution for our VMware infrastructure and I quite soon made use of it to troubleshoot some problems reported to us like backups taking longer and databases being slower than normal »