Topics started by Nashma
Acropolis Operating System upgrades happen across the cluster, one CVM at a time. Here is the next installation of the Upgrade Series as promised to provide you quick tips and tricks to plan and execute your upgrade activities with ease. In simple words, AOS is the Operating System running on the Controller VMs(CVM) in the cluster and is critical in handling the data I/O from the user VMs in the cluster. AOS can be called the core of Nutanix Hyper-converged infrastructure. As reference documents, you can check the below Guides: AOS Advanced Administration Guide Prism Web Console Guide Acropolis Upgrade Guide 2 Node Cluster Upgrade Reference Guide Note: The above listed documents are for the latest LTS release - 5.15.x (as of 17th July,2020). For version specific documents, navigate to the Documents Section in the Support Portal and check the Prism and AOS Guides by filtering the versions. Note: AOS upgrades through One click method consists of a graceful reboot of the C
This article covers the first component in a Generic Nutanix Environment Upgrade cycle - NCC. This is the first installation of the component-wise Upgrade guides series. Check out this article for a quick walk-through of the overview for a cluster-wide upgrade cycle. Nutanix Cluster Check (NCC) is a framework of scripts that can help diagnose cluster health. NCC runs on clusters and on Prism central. The workings of NCC on PC and the cluster are pretty much the same except the checks involved in the respective modules are different. NCC also includes the Logbay plug-in. Logbay is the utility used to collect logs from Controller VMs and hosts that are useful for troubleshooting issues. NCC Guide for the latest version (as of 7th of July, 2020) can be found here. To check for the release notes or Guides, navigate to Nutanix Support Portal > Menu> Documentation > NCC and filter out the NCC version from the top right section of the dropdown. Note: NCC upgrades are do
Planning to upgrade the entire Nutanix environment? Here are a few tips and tricks to plan and perform the activity in a smooth manner. If you are new to Nutanix upgrades, don't hesitate to check this KB out to understand the overview of upgrades at Nutanix. When confused which component to upgrade first, below listed generic order can be of help. Step Component Target Reboots On the fly Quick links 1 NCC on Prism Central NCC framework Health service on PC Yes NCC 3.9 2 Prism Central PCVM Prism Central VM No PC 5.17 3 NCC on Cluster NCC framework Health service on all CVMs Yes NCC 3.9 4 AOS CVM All CVMs, one at a time No AOS 5.15 5 LCM Inv
Network Time Protocol (NTP) is a protocol for clock synchronisation between computers. The hosts and CVMs in a Nutanix cluster must be configured to synchronise their system clocks with a list of stable NTP servers. Generally, at least 1 (one), but preferably 3 (three) or more reliable off-cluster NTP servers are configured on the cluster. To avoid split brain scenarios, it is always recommended to configure an odd-number of NTP servers. Some of the primary things when it comes to NTP configuration and troubleshooting can be covered using these quick links. Please note that most of the links here are for the latest LTS version - AOS 5.15(as of July 28th, 2020). To configure NTP servers on the CVMs and AHV, see Configuring NTP Servers in the Prism Web Console Guide. (Configuring NTP servers via Prism will update both the CVMs and the AHV hosts). To configure NTP servers on ESXi hosts, see Configuring Network Time Protocol (NTP) on ESX/ESXi hosts using the vSphere Client (2012069).
Prism Central is a centralized management tool that runs as a separate instance comprised of either a single VM or a set of VMs. This multi-cluster view, allows you to monitor and manage multiple clusters through a single web console. If you would like to deploy a Prism Central instance, you can either follow the 1-Click method or the manual method. Do you have a Prism Central(PC) instance deployed in your environment and are planning to upgrade it? Here is the second installation of the Upgrade Series as promised to provide you quick tips and tricks to plan and execute your upgrade activities with ease. Prism Central Guide for the latest version (as of 10th of July, 2020) can be found here. To check for the release notes or Guide, navigate to Nutanix Support Portal > Menu> Documentation > Prism and filter out the PC version from the top right section of the dropdown. Note: PC upgrades is necessarily just a reboot activity on the Prism Central Virtual Machine(s)
Have a situation where you need to upgrade cluster components or restart CVMs or hosts or just wish to check if your cluster health is normal? Below listed are a few quick checks to evaluate the cluster stability. Note that the commands listed are to be run from an SSH session to any one of the CVMs in the cluster or PCVM where applicable. No. Check Purpose CLI Command GUI method Expected output 1 Cluster services (Cluster and PC) To ensure all services are running fine on all CVMs cluster status -N/A- No services should be in 'DOWN' state 2 Metadata ring structure To ensure that the metadata ring structure is stable nodetool -h 0 ring -N/A- All the nodes must be listed and should have 'UP' and 'NORMAL' states 3 Data Resiliency To ensure that the cluster c
Ever wondered how Nutanix stores the data in your environment in a distributed format? When does SSD come into picture or when is HDD actually used? Here is a brief intro in a few words of how data moves within the cluster and links to extensive libraries for more details.The disk usage stats are governed by various factors like the type of data(Frequently used or rarely used), the type of user VM(All flash or Hybrid), the type of hardware setup(All flash or Hybrid) and also the capacity optimisation techniques used in the environment.In a few words, I can summarise data I/O path in Nutanix as follows: Under normal circumstances, all the write I/Os are written to the SSDs first. Based on the type of data(metadata or actual data), frequency of the data read back (Hot/Cold data) and other such algorithms, this data is gradually drained to the Extent Stores, which are majorly located on the HDDs and partially on the SSDs as well. Nutanix Data I/O Path:This is a pictorial representation of
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