Topics started by Sergei Ivanov
You might have noticed that the versions of AHV hypervisor have names starting from the year, such as 2017 and 2019. For example, AHV-20170830.434 and AHV-20190916.231. The difference between them is that the versions starting with 2017 are built on CentOS 6 image, while the ones starting with 2019 are based on CentOS 7. It is very important to note that all the 2019 AHV versions are only compatible with AOS versions 5.16 and newer. It means that the current LTS AOS versions 5.10.x and 5.15.x do not support AHV 2019. The AHV 2019 is currently supported only with STS AOS versions. The cluster will not let you upgrade the AHV to 2019 version if you are below 5.16. But it is possible to manually image the node with the AHV 2019 ISO and install the earlier AOS there. Also, it is possible to upload the non-default AHV during the foundation procedure together with earlier AOS. Such configurations are unsupported. If you have already done that, you will have to go to the STS AOS to
02/09/2021 Update: 3.10.1 has been released and contains the fix for this problemAn attempt to add a cluster with NVMe drives in the X-Ray 3.10.0 fails immediately.While checking the log on the X-Ray VM the following can be observed in the xray.log:ERROR Error occurred while performing final discovery - Invalid value for `type` (SSD-PCIe), must be one of ['HDD', 'SSD', 'Unknown'] That issue is specific to the version 3.10.0 of X-Ray and affects only the clusters with NVMe drives. It is a software bug that is going to be fixed in the upcoming release 3.10.1.The workaround is currently to use the earlier versions. X-Ray 3.8 is validated to work correctly.Earlier versions of X-Ray can be downloaded from the following page: https://portal.nutanix.com/page/downloads?product=xraySimply click on “Other versions” to see the previous versions.
To start this topic, it is worth to mention the difference between the data size units. There are GBs (gigabytes) and GiBs (gibibytes). The difference is the following:GB = 1000 MBGiB = 1024 MiBSo, the difference is in binary vs decimal representation. It can be confusing, because a lot of people have never heard of gibibytes and always thought that GB is 1024 MB. In fact, it is not exactly true Why it may be confusing in Nutanix running on ESXi hypervisor?Nutanix is using MiB, GiB, TiB, etc as data size units. When you create a storage container, you get the size in binary units. For the example, i have created 2 containers with advertised capacity of 1000 GiB and 1024GiB:We can see, that the 1000 GiB container is 0.98 TiB is total size, because 1 TiB=1024 GiB.However, when we go to the vCenter, we can see a different picture:vCenter reports that the 1000 GiB container is 1000 GB in size and 1024 GiB container is 1TB. But 1 TB is 1000 GB! The problem here is that the vCenter shows teb
If your cluster has no direct access to the internet, you can use the Dark Site LCM bundle, which you can put on a local web server and use it as a source for the LCM downloads.The web server can be a machine on the same Nutanix cluster that you want to upgrade or any other machine that the cluster will have access to. In this topic we will be creating a web server on a Linux machine and we will be using Apache Web Server. Note that this guide is for absolute beginners, so you will not need any prior experience. For this example, I have selected CentOS 7 as Linux distribution. If you want to use another distribution, the commands can be slightly different, so you will have to consult the documentation of the selected distribution. However, if you use CentOS, you can simply follow this guide. So, to start, install the CentOS selecting the “minimal install” and log in as root. Also, you can select in the installer in the Software Selection the Basic Web Server option. Then, you can skip
If your cluster has no direct access to the internet, you can use the Dark Site LCM bundle, which you can put on a local web server and use it as a source for the LCM downloads.The web server can be a virtual machine on the same Nutanix cluster that you want to upgrade or any other machine that the cluster will have access to. In this topic we will be creating a web server on a Windows machine and we will be using Microsoft IIS (Internet Information Services), so you will not need to download and install any third party software. Note that this guide is for absolute beginners, so you will not need any prior experience with this technology. So, first, we need to enable the IIS. Type the “Server Manager” in the Windows search and launch it.In the Server Manager click Manage in the top right corner and select “Add Roles and Features”. Click Next until you get to the Server Roles. In the list of Server Roles, select Web Server and click Next. The default options are sufficient. Click Next
You may get an alert from NCC stating that the deduplication fingerprinting has been disabled, but it is enabled on a container: WARN: Fingerprinting is disabled by stargate, but configured on Storage Container(s) As we know, Stargate is the service that is managing storage on a Nutanix cluster, so Stargate has some conditions on which it will automatically disable deduplication. If the metadata usage is higher than 250Gb on a node. If the metadata usage is higher than 50% of the total metadata space on a node. The second condition is common on small size clusters, for example NX-1000 series, with single-SSD nodes if the SSD size is small. The metadata is located on the SSDs and the total metadata size on the node is equal to the capacity of: One SSD in single-SSD nodes Two SSDs in double-SSD nodes Four SSDs in all-flash nodes So, for example, if you have a node with 1 SSD which is 480Gb in size, 50% of the metadata capacity will be 240Gb (in fact it will b
Starting from AOS 5.10.2 and newer, if you run the ‘cluster status’ command, you may see that there is a new service running on the cluster called Xtrim. That service was not present before 5.10.2: Xtrim is the service that is going to improve the performance of the cluster. If we look a bit deeper, it improves the write performance by periodically trimming the SSDs. In Nutanix all the disks are passed-through from the host to the CVM and the CVM is managing the disks, so the Xtrim service running on CVMs is doing the trimming of the physical SSDs. So, what is trim? TRIM is a command with the help of which the operating system can tell the solid state drive (SSD) which data blocks are no longer needed and can be deleted, or are marked as free for rewriting. In other words, TRIM is a command that helps the operating system know precisely where the data that you want to move or delete is stored. That way, the solid state drive can access only the blocks holding the data. Further
When you run ESXi hypervisor on Nutanix you may get a question: should I install VMware tools or Nutanix Guest Tools (NGT) or both? Are NGT and VMware tools compatible between each other? The answer is yes, they are compatible and can be both safely installed on the same virtual machine. If you install NGT in guest VMs, you can use the following advanced features (NGT applications): File Level Restore CLI Nutanix VM Mobility VSS requestor and hardware provider for Windows VMs Application-consistent snapshot for Linux VMs You can read in more details about the NGT here. VMware tools in turn has different features and a different purpose. Installing VMware Tools eliminates or improves these issues: Low video resolution Inadequate color depth Incorrect display of network speed Restricted movement of the mouse Inability to copy and paste and drag-and-drop files Missing sound Provides the ability to take quiesced snapshots of the guest OS Synchronizes the time in the guest o
When there is a new patch released by VMware for ESXi, you may want to check the Compatibility Matrix on the Portal, but the matrix shows only ESXi versions and update numbers, it doesn’t show every patch build number. What to do and how to understand if the patch is supported or not? Let’s break down the ESXi versions into possible options: Versions. Those are the numbered versions, for example, 6.0, 6.5, 6.7 and 7.0. All the versions need to be qualified and the qualification is a requirement. They will not be supported if they are not qualified. Check the compatibility matrix on the Nutanix portal to see if it is supported. Updates. Those are what you usually see after the “U” in the version name, for example, 6.7U1, 6.7U2. 6.7U3. They also will not be supported until they are qualified. Check the compatibility matrix on the Nutanix portal to see if the Update is supported. Patches. There are many ways that VMware calls its patches, examples are: ESXi 6.7 EP 15, ESXi 6.7 P01, ES
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