Connecting Cloud Innovators: Building Community at .NEXT 2024
Sometimes, NCC (Nutanix Cluster Check) will alert for PSU down and a case is automatically created when a PSU down is detected.This can be a false positive alert or are transient errors (when relocating a node or some maintenance which requires a PSU down).However, a Power supply alert should never be taken lightly. One can always verify the physical status of Power supply by checking the LED indicators on the PSU unit itself, but in certain cases this may not be possible right away - due to the equipment location etc. To ensure Power Supplies of a Block or Node are in optimal state, you can login to the physical host or execute a command from the CVM to check their status:From a AHV Host:[root@AHV-HOST~]# ipmitool sdr | grep -i psPS1 Status | 0x01 | okPS2 Status | 0x01 | okFrom a CVM on AHV (this will query all HOSTS in the cluster):nutanix@cvm$ hostssh "ipmitool sdr | grep -i ps"From a CVM on a ESXi Host:You can query all hosts PSU status:nutani
High-Availability(HA) is a life-saver feature which minimises downtime and can save the production environment. What exactly is HA in AHV? AHV VM High Availability (HA) is a feature built to ensure VM availability in the event of a host or block outage. In the event of a host failure, the VMs previously running on that host will be restarted on other healthy nodes throughout the cluster. Want to know more about AHV HA? Give the following KB article a read!4636 So, do we ever want to disable HA for few VMs? Yes, there could be situations and architecture constraints which might make us disable HA for a few critical VMs.The reason, you ask? (*voice of Yoda*) One possible situation could be licencing constraints of few application workloads which are tied to host CPU. So what happens when you disable AHV HA for a particular VM? In case of a node failure, the VM will not be migrated and started on another Node. How can we achieve this? Read more about disabling HA and Agent-V
Nutanix offers a monitoring & alerting utility, NCC - Nutanix Cluster check, which comes pre-installed on every CVM.Nutanix Cluster Check is a powerful framework which includes several plugins to monitor & alert on different hardware and software components. It is installed on every CVM across a single cluster on all nodes.It comes with almost all Nutanix products, such as Prism Central, Files etc. NCC will include the relevant checks for these products, enabling Nutanix administrators to keep on top of any software, configuration issues. Following are some of the important Hardware (Physical Components) checks and alerting offered byNCC:a) Periodic Disk checksb) Periodic BIOS / BMC Firmware checks (Versions / Upgrades required)c) Boot Devices Monitoring (Sata DOM or M.2)d) SSD and HDD wear and tear checkse) BIOS, BMC checks to ensure all hardware components are current and stablef) Network Interface card checksg) IPMI / Out of band management interface checksh) Power Supply
In our previous post “Time Synchronisation on Nutanix Cluster”, we highlighted time sync importance and some commands to check status of time-sync on a Nutanix Cluster.In this post, we will briefly go through some important recommendations in selecting a time-source for your Nutanix Cluster.Nutanix recommends using at least 5 stable time sources that have a high degree of accuracy and that can be reached over a reliable network connection. Generally, the lower the stratum of an NTP source, the higher its accuracy. If lower stratum time sources (e.g. stratum 0, stratum 1) are difficult to gain access to, then higher stratum time sources (e.g. stratum 2, stratum 3) may be used.For more details, see Nutanix Recommendation for Time Synchronization. For a list of Stratum One Servers: http://support.ntp.org/bin/view/Servers/StratumOneTimeServersIf you have to select a Off-Site time-source, following is a good selection of points to consider:http://support.ntp.org/bin/view/Support/SelectingOf
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