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Some useful vmkfstools ‘hidden’ options
1. Display hosts which are actively using a volume ~ # vmkfstools –activehosts /vmfs/volumes/TEST-DATASTORE Found 1 actively heartbeating hosts on volume ‘/vmfs/volumes/TEST-DATASTORE’ (1): MAC address 91:1a:b2:7a:14:d4…
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What is VMware Raw Device Mapping (RDM)?
In other contexts, such as the VirtualCenter client console, raw device mapping may be described in terms such as “Mapping a VMFS volume into a…
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vSAN memory or SSD congestion reached threshold limit
This is a common issue that we get in VSAN. Examples of this alert are: LSOM Memory Congestion State: Exceeded. Congestion Threshold: 200 Current Congestion:…
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Tag Devices as SSD
You can use PSA SATP claim rules to tag SSD devices that are not detected automatically. About this task : ++++++++++++++++ Only devices that are…
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What are the common types of congestion that are reported, and how can I address them in VSAN?
The types of congestion and remedies for each type are listed below: SSD Congestion: SSD congestion is typically raised when the active working set of write…
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vSAN performance diagnostics reports: “One or more disk(s) are not in active use”
This issue means that one or more vSAN backend capacity disks do not see any IOs. This issue is delivered only for all-flash vSAN clusters…
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vSAN performance diagnostics reports: “One or more disk group(s) are not in active use”
This issue means that the specified disk groups do not have IOs during some period of the evaluated time duration, which limits the maximum possible…
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Understanding vSAN memory consumption in ESXi 6.5.0d/ 6.0 U3
To calculate vSAN memory consumption in these releases, use this equation: BaseConsumption + (NumDiskGroups * (DiskGroupBaseConsumption + (SSDMemOverheadPerGB * SSDSize))) +(NumCapacityDisks * CapacityDiskBaseConsumption) Where: BaseConsumption: is…
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