The ramblings of a computer geek
Tristan Self The array OS 5.1.x and later supports iSCSI Group Scoped Target (GST) on iSCSI arrays (this is new), previous to this it was using VST Volume Scoped Targeting. GST reduces the number of individual host connections you need to configure and manage, which saves you time and also ensures you don’t hit limitations in the … Read more
You can deploy an NFS server onto an Ubuntu Linux server to allow you to provide NFS exports to other machines on your network. The documentation below provides a very quick guide on how to do this. It assumes you have a Ubuntu Linux 22.04 LTS machine with some storage attached that you want to … Read more
We needed to install Ruby 2.7 instead of what normally comes with Ubuntu 20.04 LTS, if we installed a later than 2.7 Ruby version, the particular application (i.e. Staytus in this case) would barf. The nice people at BrightBox have created some packaged installs of Ruby at various versions.https://www.brightbox.com/docs/ruby/ubuntu/#adding-the-repositoryhttps://launchpad.net/~brightbox/+archive/ruby-ng (Latest version supported 20.04) We first … Read more
In certain situations the Exchange DAG witness can become a problem, this can occur during an upgrade or can happen if there is a network interruption. Although the DAG will continue to operate the witness is considered failed, which can cause odd behaviour in a failover scenario, as there is no quorum available for the … Read more
You can retrieve the HPE ilO Licence key from your existing iLO, perhaps you’ve had a failure of the motherboard and need to get the key out because you’ll be replacing the motherboard due to a fault with a new one and need the key out so you can re-enter it. Firstly login to the … Read more
Another very simple AWS Cloudformation example. The template deploys the following:
AWS Cloudformation is a tool and declaritive language you can use to declare what you want your “stack” (i.e. your deployment of AWS resources) to look like. You define all the resources you want AWS to spin up in a blueprint document, click a button, and then AWS magically creates it all. This blueprint is … Read more
The Path Selection Policy is set for devices to determine how the ESXi host will utilise the paths to the storage, for example, you can have “Fixed” or “Round Robin” or “Most Recently Used”, you can also have storage vendor provided ones such as “NIMBLE_PSP_DIRECTED”. The scripts and commands I’ve found keep mentioning “Multipathing”, if … Read more
We had a very odd situation occur on one of our VMware ESXi 7.0.3 clusters (VMware ESXi, 7.0.3, 20328353), which is using iSCSI with HPE Nimble Storage. Some new storage was presented to the hosts via iSCSI. The first host was scanned, the datastore prepared as normal. Once complete, then started to perform a re-scan … Read more
Sometimes it is helpful just to get a script running on a machine to generate some disk IO load. I use this for two main reasons, one is during the testing or proving of a storage platform in terms of its availability during a fail-over or maintenance situation (e.g. it’s storage processors), the other is … Read more