What is Latency?
What is Latency? KB ID 0001874 What is Latency? I hear people use the word ‘Latency’ a lot, mostly without ever really understanding what it is, unlike its close relations bandwidth and thoughput* which are measurments of data, latency is a measurment of TIME, and in a lot scenarios is variable depending on what’s happening. *Note: Too low bandwidth and thoughput can increase latency. There will always be latency,...
VMware Converter Slow!
KB ID 0001584 Problem I was P2Ving a server for a client this week. I did a ‘trial run’ just to make sure everything would be OK, and got this; Yes, that says 13 days and 29 minutes! Suddenly doing this at 1700hrs on a Friday became a moot point! (Note: I was using VMware vCenter Converter Standalone version 6.2) Solution At first I assumed this was a network problem, so I moved everything onto the same Gigabit switch, and...
Backup Exec – Using RDX Drives
KB ID 0000578 Problem While I like RDX drives, (they have advantages over magnetic tape), but they do have a drawback, throughput. As you can see the removable drive/cartridges are just 1TB SATA Drives in a protective jacket, with a “write protection switch” on them. So they should be perfect as a backup medium, the problem is, the drive carrier itself runs off the USB bus, so they can’t run faster than 48MB a second...
HP Networking ‘ProCurve’ – Trunking / Aggregating Ports
KB ID 0000638 Problem I was lending a hand this week, while my colleague swapped out a lot of switches. I don’t usually deploy a large number of HP switches, so I was surprised when we installed a chassis switch and after patching the fiber links, the Cisco Catalyst switches all got upset and we lost three out of four ping packets. I (wrongly) assumed that STP would be enabled, so I wandered back and pulled the second fiber...