💰 Web Guide: FlashArray® VMware Best Practices - Pure1 Support Portal

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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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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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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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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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BEST PRACTICE: Set FlashArray host objects to have the FlashArray “ESXi” a given volume which allows ESXi (and therefore the virtual machines ESXi throttles virtual machines by artificially reducing the number of slots.


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Navigate to Advanced Options and modify the DelayedAck setting by using the option that best matches your requirements, as follows:. For FlashArrays running 5. 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. 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} 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:. In some iSCSI environments it is required to enable jumbo frames to adhere with the network configuration between the host and the FlashArray. To better understand how these parameters are used in iSCSI recovery efforts it is recommended you read the following blog posts for deeper insight:. With the release of vSphere 6. If none of the above circumstances apply to your environment then this value can remain at the default. 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. 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. A well balanced host should be within a few percentage points of each path. This makes the chance of exposure to mistakes quite large. If an ESXi host is running VMs on the array you are setting the host personality on, data unavailability can occur. This can be set on a per-device basis and as every new volume is added, these options can be set against that volume. This is inevitable when dealing with large and complex environments. 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. 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. If you are running earlier than ESXi 6. Many of the techniques and operations can be simplified, automated and enhanced through Pure Storage integration with various VMware products:. {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. Verifying Connectivity. 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. 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. 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. These volumes should be connected to the host object instead. This can lead to continually decreasing performance until congestion clears. In highly-congested networks, if packets are lost, or simply take too long to be acknowledged, due to that congestion, performance can drop. Often times this is a result of the increased logging that happened during the time of the issue. A lower value is also acceptable. 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. Once jumbo frames are configured, verify end-to-end jumbo frame compatibility. Pure Storage recommends keeping this value on whenever possible. 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. Enabling jumbo frames can further harm this since packets that are retransmitted are far larger. If you are using ESXi 7. This can also be accomplished through PowerCLI. Private volumes, like ESXi boot volumes, should not be connected to the host group as they should not be shared. Optionally, the ESXi host can be rebooted so that it can inherit the multipathing configuration set forth by the new rule. Note that ESXi 6. If jumbo frames are enabled, it is absolutely recommended to disable DelayedAck. Options or configurations that are to be left at the default are generally not mentioned and therefore recommendations for default values should be assumed. DelayedAck is highly recommended to be disabled, but is not absolutely required by Pure Storage. That being said, it is a host wide setting, and it can possibly affect storage arrays from other vendors negatively. In Purity 5. Please refer to the following post for a detailed walkthrough:. In general, we endeavor inside of Purity to automatically behave in the correct way without specific configuration changes. This report should be listed as redundant for every hosts, meaning that it is connected to each controller. Refer to ESXi 6. The ESXi host setting, Disk. A fabric logout and login may occur and accidental PDL can occur. What gives? It is important to work with your networking team and Pure Storage representatives when enabling jumbo frames. Inside of ESXi you will see a new system rule:. 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. The number of logical paths will depend on the number of HBAs, zoning and the number of ports cabled on the FlashArray. This will report the path selection policy and the number of logical paths. If it is not changed on hosts running VMs being replicated by vSphere Replication, replication will fail. If the FlashArray is running 5. In this case, Pure Storage supports disabling this value and reverting to traditional heart-beating mechanisms. 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. 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. The purpose is to outline the proper configuration for general understanding. It is important to verify proper connectivity prior to implementing production workloads on a host or volume. Starting with ESXi 6. The makes provisioning easier and helps ensure the entire ESXi cluster has access to the volume. This section describes the recommendations for creating provisioning objects called hosts and host groups on the FlashArray. To avoid this possibility, only set this personality on hosts that are in maintenance mode or are not actively using that array. For detailed explanation of the various reported states, please refer to the FlashArray User Guide which can be found directly in your GUI:. 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. Enabling jumbo frames is a cross-environment change so careful coordination is required to ensure proper configuration. Refer to this post for more information. In these situations it is necessary to reduce the ESXi parameter Disk. By default this is 32 MB. All settings that are not mentioned here should remain set to the default. The rest of the paths will be then denoted as a percentage of that number. HardwareAcceleratedInit, DataMover. Enabling CHAP is optional and up to the discretion of the user. It is for this reason that Pure Storage recommends as a best practice that NTP be enabled and configured on all components. Option 1: Modify the DelayedAck setting on a particular discovery address recommended as follows:. A detailed description of these integrations are beyond the scope of this document, but further details can be in the VMware Platform Guide documentation. Generally, volumes that are intended to host virtual machines, should be connected at the host group level. The following command creates a rule that achieves both of these for only Pure Storage FlashArray devices:. While the majority of environments are able to successfully recover from these events unscathed this is not true for all environments. 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. Changing a host personality on a host object on the FlashArray causes the array to change some of its behavior for specific host types. No matter how perfect an environment is configured there will always come a time where troubleshooting an issue will be required. 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. 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 verify, try to ping an address on the storage network with vmkping. Based on extensive testing Pure Storage recommendation is to leave these options configured to their defaults and no changes are required. Pure Storage recommends tuning this value down to the minimum of 1. No configuration changes are required. A working familiarity with VMware products and concepts is recommended. This document is intended to provide understanding and insight into any pertinent best practices when using VMware vSphere with the Pure Storage FlashArray. If another vendor is present and prefers it to be disabled, it is supported by Pure Storage to disable it. A higher value is supported but not necessary. A FlashArray volume can be connected to either host objects or host groups. For example, to set the Login Timeout value to 30 seconds, use commands similar to the following:.