Many log messages come up referring to the device WWN naa id e.g 2019-09-02T10:30:44.337Z: [scsiCorrelator] 304273812631us: [vob.scsi.device.io.latency.high] Device naa.60002ac000000000000000140001eac6 performance has deteriorated. I/O latency increased from average value of 826 microseconds to 16837 microseconds. 2019-09-02T10:30:44.337Z: [scsiCorrelator] 304280755082us: [esx.problem.scsi.device.io.latency.high] Device naa.60002ac000000000000000140001eac6
Pure Storage and VVOLs
Without the plugin… The plugin makes it easy to – among other things – register the VVOL vasa provider on the array. But here’s how you do without it. Reasons for not wanting to use the plugin are: Keeps VCSA
VCSA 6.7u2b ISO and LDAP errors
The latest (as of 26th June 2019) version on vCenter Server Appliance is 6.7u2b. This may come as somewhat of a suprise – as that is not available as a download from VMware. We discovered this after deploying 6.7u2, then
Windows Server 2019 Activation Issues
If you try and activate a WIndows 2019 server using a (valid) MAK key, it fails. it’s a known bug and folks have been very vocal on a lot of communities. At this stage, I’m also aware only of the
Create random files
Needing to generate random files on windows? Try this powershell one liner…. Generates 100 1G files of random data. Not as easy as the old dd on linux. But it works Note:fsutil file createnew is no good as it created
Meltdown, Spectre, Virtual loads and Security
I’ve done some work in testing the performance and mitigation of Meltdown and Spectre on the VMWare platform. In summary I can confirm that even when patching the hypervisor host, it does not mitigate or automatically protect Guest VMs. The
Linux un-numbered interfaces for Packet Capture
Nicely lifted from https://github.com/Security-Onion-Solutions/security-onion/wiki/NetworkConfiguration you can also configure to start tcpdump in post-up
Juniper, Fortigate Cheat Sheet
(and Cisco too) see also https://forums.juniper.net/t5/Configuration-Library/CLI-commands-Cisco-VS-Juniper-router-will-help-in/td-p/68088 https://forums.juniper.net/t5/Configuration-Library/SRX-Configuration-Cheat-Sheet/td-p/63057 http://netfixpro.com/wp-content/uploads/2016/09/Juniper-Commands-Cheat-Sheet-1.pdf Basic Commands BGP Commands
vmk interfaces, ping and netstacks
Once upon time there was ‘ping’. A nice tool to check connectivity. Had the ability to set the df (don’t fragment bit) and set size so you could check end to end MTU. Then along came ‘vmkping’, which is pretty
Setting SNMP on all ESXi 6.5 hosts in a cluster
Has been done before, but things have changed with 6.5 and Get-EsxCli -V2, so I thought I’d share an updated script. This makes sure you have the same SNMP settings on all hosts. This is kind of a response