🔥 Virtual Machine and Guest Configuration - Pure1 Support Portal

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VMware vSphere HA cluster can restart VMs within your cluster. This is the first option from the top, within the drop-down menu. the default is to “cover all powered-on VMs” and basically, it calculates the slot size based on.


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vSphere Virtual Machine Encryption Recommendations 36 This book, Performance Best Practices for VMware vSphere , provides Make sure storage adapter cards are installed in slots with enough bandwidth to support their expected number of factors, including NUMA node sizes, CPU cache locality, and.


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vSphere Virtual Machine Encryption Recommendations 36 This book, Performance Best Practices for VMware vSphere , provides Make sure storage adapter cards are installed in slots with enough bandwidth to support their expected number of factors, including NUMA node sizes, CPU cache locality, and.


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when enabled, but in many cases, these defaults are not best practices. HA's slot size is equal to the largest powered-on virtual machine's reservation plus.


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The slot size is based on the largest reserved memory and CPU needed for any virtual machine. When you mix virtual machines of different CPU and memory.


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VMware vSphere offers three virtual disks formats: thin, zeroedthick and eagerzeroedthick. virtual disks allocate all of their provisioned size upon creation and also BEST PRACTICE: Use thin virtual disks for most virtual machines. it can unfairly steal queue slots from other virtual machines sharing the.


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The slot size is based on the largest reserved memory and CPU needed for any virtual machine. When you mix virtual machines of different CPU and memory.


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The slot size is based on the largest reserved memory and CPU needed for any virtual machine. When you mix virtual machines of different CPU and memory.


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Dell EMC PowerStore: VMware vSphere Best Practices | H containing both nodes (node A and node B) and the NVMe drive slots. external ESXi hosts​, the VMFS datastore sizing and virtual-machine placement.


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Keeping the slot might reduce the amount of paging I/O, but can result in more z/VM uses spool to hold several kinds of temporary (print output, transferred files, trace data, and so The size depends on the amount of memory in the LPAR.


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If you are running earlier than ESXi 6. No matter how perfect an environment is configured there will always come a time where troubleshooting an issue will be required. Configuration and detailed discussion is out of the scope of this document, but it is recommended to read through the following VMware document that describes this and other concepts in-depth:. This makes the chance of exposure to mistakes quite large. No configuration changes are required. Whereas the legacy method involves plain SCSI reads and writes with the VMware ESXi kernel handling validation, the new method offloads the validation step to the storage system. These volumes should be connected to the host object instead. It is for this reason that Pure Storage recommends as a best practice that NTP be enabled and configured on all components. This document is focused on core ESXi and vCenter best practices to ensure the best performance at scale and to explain management techniques to maintain the heath of your VMware vSphere environment on FlashArray storage. A working familiarity with VMware products and concepts is recommended. A detailed description of these integrations are beyond the scope of this document, but further details can be in the VMware Platform Guide documentation. If jumbo frames are enabled, it is absolutely recommended to disable DelayedAck. Pure Storage recommends tuning this value down to the minimum of 1. Enabling jumbo frames is a cross-environment change so careful coordination is required to ensure proper configuration. If an ESXi host is running VMs on the array you are setting the host personality on, data unavailability can occur. Please remember that each of these settings are a per-host setting, so while a volume might be configured properly on one host, it may not be correct on another. Pure Storage recommends keeping this value on whenever possible. Private volumes, like ESXi boot volumes, should not be connected to the host group as they should not be shared. DelayedAck is highly recommended to be disabled, but is not absolutely required by Pure Storage. Once a thorough review of these iSCSI options have been investigated, additional testing within your own environment is strongly recommended to ensure no additional issues are introduced as a result of these changes. To avoid this possibility, only set this personality on hosts that are in maintenance mode or are not actively using that array. To better understand how these parameters are used in iSCSI recovery efforts it is recommended you read the following blog posts for deeper insight:. Starting with ESXi 6. The purpose is to outline the proper configuration for general understanding. The makes provisioning easier and helps ensure the entire ESXi cluster has access to the volume. If it is not changed on hosts running VMs being replicated by vSphere Replication, replication will fail. If you are using ESXi 7. Option 1: Modify the DelayedAck setting on a particular discovery address recommended as follows:. In this case, Pure Storage supports disabling this value and reverting to traditional heart-beating mechanisms. A well balanced host should be within a few percentage points of each path. A fabric logout and login may occur and accidental PDL can occur. Many of the techniques and operations can be simplified, automated and enhanced through Pure Storage integration with various VMware products:. All settings that are not mentioned here should remain set to the default. This report should be listed as redundant for every hosts, meaning that it is connected to each controller. It is important to note that the FlashArray vSphere Web Client Plugin will automate all of the following tasks for you and is therefore the recommended mechanism for doing so. A lower value is also acceptable. If a volume is intended to be shared by the entire cluster, it is recommended to connect the volume to the host group, not the individual hosts. With the release of vSphere 6. Verifying Connectivity. Based on extensive testing Pure Storage recommendation is to leave these options configured to their defaults and no changes are required. Be Aware that moving a host out of a host group will disconnect the host from any volume that is connected to the host group. Inside of ESXi you will see a new system rule:. The increased logging leads to thresholds for file size and counts being exceeded and thus the the older logs are automatically deleted as a result.{/INSERTKEYS}{/PARAGRAPH} By default this is 32 MB. Navigate to Advanced Options and modify the DelayedAck setting by using the option that best matches your requirements, as follows:. The ESXi host setting, Disk. If another vendor is present and prefers it to be disabled, it is supported by Pure Storage to disable it. If DelayedAck is enabled, where not every packet is acknowledged at once instead one acknowledgement is sent per so many packets far more re-transmission can occur, further exacerbating congestion. This is not a particularly good option as one must do this for every new volume, which can make it easy to forget, and must do it on every host for every volume. Moving forward other behavior changes for ESXi might be included and doing it now ensures it is not missed when it might be important for your environment. If the FlashArray is running 5. For example, to set the Login Timeout value to 30 seconds, use commands similar to the following:. One way to help alleviate some of the stress that comes with troubleshooting is ensuring that the Network Time Protocol NTP is enabled on all components in the environment. A higher value is supported but not necessary. In some iSCSI environments it is required to enable jumbo frames to adhere with the network configuration between the host and the FlashArray. The Round Robin PSP rotates between all discovered paths for a given volume which allows ESXi and therefore the virtual machines running on the volume to maximize the possible performance by using all available resources HBAs, target ports, etc. Enabling CHAP is optional and up to the discretion of the user. This performance penalty was invoked because the ESXi host would continue using the non-optimal path due to limited insight into the overall path health. In highly-congested networks, if packets are lost, or simply take too long to be acknowledged, due to that congestion, performance can drop. This will report the path selection policy and the number of logical paths. This can lead to continually decreasing performance until congestion clears. Once jumbo frames are configured, verify end-to-end jumbo frame compatibility. A FlashArray volume can be connected to either host objects or host groups. The rest of the paths will be then denoted as a percentage of that number. This can also be accomplished through PowerCLI. HardwareAcceleratedInit, DataMover. In these situations it is necessary to reduce the ESXi parameter Disk. It is important to work with your networking team and Pure Storage representatives when enabling jumbo frames. To verify, try to ping an address on the storage network with vmkping. Generally, volumes that are intended to host virtual machines, should be connected at the host group level. {PARAGRAPH}{INSERTKEYS}This paper will provide guidance and recommendations for ESXi and vCenter settings and features that provide the best performance, value and efficiency when used with the Pure Storage FlashArray. In general, we endeavor inside of Purity to automatically behave in the correct way without specific configuration changes. Since DelayedAck can contribute to this it is recommended to disable it in order to greatly reduce the effect of congested networks and packet retransmission. Pure Storage is NOT susceptible to this issue, but in the case of the presence of an affected array from another vendor, it might be necessary to turn this off. Refer to this post for more information. This document is intended to provide understanding and insight into any pertinent best practices when using VMware vSphere with the Pure Storage FlashArray. For FlashArrays running 5. Please refer to the following post for a detailed walkthrough:. Note that ESXi 6. While the majority of environments are able to successfully recover from these events unscathed this is not true for all environments. Changing a host personality on a host object on the FlashArray causes the array to change some of its behavior for specific host types. A setting not mentioned here indicates that Pure Storage does not generally have a specific recommendation for that setting and recommends either the VMware default or to just follow the guidance of VMware. Refer to ESXi 6. It is important to verify proper connectivity prior to implementing production workloads on a host or volume. Optionally, the ESXi host can be rebooted so that it can inherit the multipathing configuration set forth by the new rule. This section describes the recommendations for creating provisioning objects called hosts and host groups on the FlashArray. In Purity 5. Often times this is a result of the increased logging that happened during the time of the issue. This can be set on a per-device basis and as every new volume is added, these options can be set against that volume. For detailed explanation of the various reported states, please refer to the FlashArray User Guide which can be found directly in your GUI:. The following command creates a rule that achieves both of these for only Pure Storage FlashArray devices:. That being said, it is a host wide setting, and it can possibly affect storage arrays from other vendors negatively. If none of the above circumstances apply to your environment then this value can remain at the default. This is inevitable when dealing with large and complex environments. What gives? Changing or altering parameters not mentioned in this guide may in fact be supported but are likely not recommended in most cases and should be considered on a case-by-case basis. Enabling jumbo frames can further harm this since packets that are retransmitted are far larger. Options or configurations that are to be left at the default are generally not mentioned and therefore recommendations for default values should be assumed. The number of logical paths will depend on the number of HBAs, zoning and the number of ports cabled on the FlashArray.