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Showing posts from September, 2015

Powershell: CPU Load Generator

Found this snippet online. foreach ($loopnumber in 1..2147483647) {$result=1;foreach ($number in 1..2147483647) {$result = $result * $number};$result} Works great, but only seems to hit a single CPU.  In order for it fully load all CPU's, I decided to augment it by simply having it launch a powershell window per CPU/Core found w/ the same script running in a loop. Here is what I came up w/ below: #$NumberofProcs = (Get-WMIObject win32_processor | Measure-Object NumberofLogicalProcessors -sum).sum #Updated based on anonymous feedback. $NumberofProcs= [int]$env:Number_of_Processors While ($NumberofProcs -ne 0) { $NumberofProcs-- Start Powershell.exe -ArgumentList '"foreach ($loopnumber in 1..2147483647) {$result=1;foreach ($number in 1..2147483647) {$result = $result * $number};$result}"' } For some context, I was using this script to force vRealize Operations to send a notification for anomalous behavior on a typically low use VM. Thanks anonymous! I'

vSAN Cost-Effective Architecture (For Desktops, almost there for servers)

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So my esteemed colleague, Andrew Harding , brought this to my attention and the idea has kind of blossomed.  I thought it was rather clever approach to implementing VSAN in a cost effective manner. The current line of thinking w/ VSAN is that you buy each host w/ the exact same disk configuration. In this way, with each host purchase, you not only get capacity, but you get additional I/O and CPU/Memory performance. Disclaimer: Mac Mini's are completely unsupported by VMware, this is for illustration purposes only. There are a couple problems w/ this model: Additional vSphere license cost Additional VSAN license cost Additional Hardware SSD/Disk cost Being that VSAN does NOT attempt to keep VM storage data local to a host, you can augment your VSAN cluster w/ simple compute hosts that have no storage.  Meaning, if you don't have storage capacity or I/O performance problems, you can simply add another host that does not participate in the VSAN for additional CP

vSphere Web Client (vCSA) stuck on authenticating

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Related to vSphere 5.5 and vCenter Server Appliance. Basically, when attempting to log into the web client I would get the following error message or the dreaded authenticating forever loading bar: Could not connect to vsphere web client contact your administrator to fix this issue Long story short, I did the following to fix my problem: Switched to embedded SSO and back to external SSO. Honestly, this step may or may not have been needed, but I did notice errors in my SSO server logs.  You might try step 2 first just to see. Under the admin tab select Yes for certificate regeneration and hit submit. Then switched back to no. Restarted Web Client Service. Details: Thankfully, I had another vCenter appliance attached to the same SSO server that was working fine.  So to troubleshoot, I looked at the virgo logs for the web client on the one that was working and that one that was not.  I noticed that my working vCenter Web Client would get a response back from t