Vmware uses Native multipathing plugin ( NMP) to manage and load balance IOs. The default value is 32 and Pure doesn't suggest to change this parameter until some issue reported on outstanding IOs. DSNRO / Number of outstanding IOsĭisk.SchedNumReqOutstanding (DSNRO) option means when two more Virtual machine uses the same LUN or datastore, DSNRO controls or manage to limit the number of IOPS that will be issued to the datastore or LUN. Keep in mind that, if jumbo frames are enabled then Delayed ack must be disabled to avoid retransmission of larger packets.
It is an optional parameter, because it depends on your environment, whether Jumbo frames are supported or not. By-default 1500 is the default value, but you can set it as 9000 to enable Jumbo frames. VMware allows sending Jumbo frames out of physical network if the end to end devices like network switches, Host adapters and storage supports the jumbo frame. Pure suggests it to disable to improve performance in a congested network. TCP Delayed ACK (iSCSI)Ĭongestion may occur when there is a mismatch of data processing capabilities between source and destination network elements and acknowledgement of every packet is delayed.Ĭongestion may result in timeout, delay and loss of packets. Recommended value as per Pure documents is 30 seconds as it ensures iSCSI sessions survive controller reboots during maintenance or failures. It results in the " login storm" situation, due to the extra load on the storage array. Image credit Pure Storage support guide iSCSI Login Timeoutīy default, ESXi set iSCSI login timeout as 5 seconds, which means ESXi will kill iSCSI session after 5 seconds, if it's idle and try to re-login immediately. All these VAAI features can be enabled from Vsphere web client or command line. It must be enabled (set as 1), disabling it may impact on array performance. It enables and controls the Atomic Test & Set (ATS), which is used during file creation and locking on VMFS volume.
The by-default option is 1, means enabled. HardwareAcceleratedMoveĮnables and controls use of XCOPY, this option is used to copy or migrate data within the array. HardwareAcceleratedInit feature enables and controls the use of zero blocks ( Write Same) or SCSI ( 0xFE) commands specific to the storage vendor. These are set as 1 (enabled) by default, but a validation check is required. VAAI features are used to offload and accelerate few operations in Vmware infrastructure. Disabling VAAI feature may greatly reduce the performance and efficiency of Flash array. This is one of the VAAI ( vStorage APIs for Array Integration) feature that must be enabled. Parameter's description HardwareAcceleratedInit Let me give you some detail about each option so that you can get a clear understanding of the parameters.
LatencyEvalTime - 30000 VMFS Version 6.x and 7.x 6 5 Datastore and permanent device loss All Power off and restart LatencyEvalTime - 30000 sampling cycles - 16
#Vmware vsphere 6.5 cheat sheet psp#
ESXi Parameter ESXi Version Recommended Default HardwareAcceleratedInit All 1 1 HardwareAcceleratedMove All 1 1 VMFS3.HardwareAcceleratedLocking All 1 1 iSCSI Login Timeout All 30 5 TCP Delayed ACK (iSCSI) All Disabled Enabled Jumbo Frames (Optional) All 9000 1500 DSNRO / Number of outstanding IOs 5.x,6.x 32 32 Path Selection Policy 5.x Round Robin MRU IO Operations Limit (Path Switching) 5.x 1 1000 UNMAP Block Count 5.x 1% of free VMFS space or less 200 EnableBlockDelete 6.x and 7.x 1 0 Latency Based PSP (ESXi 7.0) 7.x sampling cycles - 16
#Vmware vsphere 6.5 cheat sheet update#
These are latest till today (July 2020), I will keep an eye and update this table in future with all changes. These are actually important must implement parameters in my view. It will help you to quickly understand and implement it in your environment. I have created this table by reading and consolidating all parameters mentioned in long guides, pdfs and support articles of Pure Flash array. Their Evergreen offering is also eye catchy and the way they provide Data reduction is also one of the milestones in the Enterprise storage industry as per my view.Įnough about Pure let's direct talk about Recommended Pure settings - Pure Storage Flash Array VMware Best Practise Its active-active cluster is also amazing and provides an option to host your mediator (Witness) in the Pure cloud as free, then you don't need any 3rd site to host it. Pure Storage is really a good product comprise of performance, scalability, simplicity, highly redundant and awesome vendor support. Gartner named Pure Storage as leading primary storage for the year 2019 in the magic quadrant. Pure storage flash array is (100% NVMe and software-driven) product of Pure company, which is really growing very fast in the field of Flash storage.
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