Under the storageDevice property sits a HostStorageDeviceInfo object.
In this object you have several lists of storage related entries.
The ScsiLun property is an array that holds all the LUNs present on the host. In these entries you will find the CanonicalName for each LUN.
The multiPath property is also an array that holds again all the LUNs together with the Path information for each of these LUNs.
Unfortunately these entries do not contain the CanonicalName for a LUN.
So we have to combine the information of these 2 arrays together.
The outer loop runs through all the LUNs present in the array under the ScsiLun property.
The inner loop runs through all the LUNs present in the array under the multiPath property.
Since we only want to count the paths for 1 specific LUN, we use the "key" of the ScsiLun entry to select only the multiPath entries that correspond with that specific LUN. The ScsiLun "key" is present in the multiPath LUN as the "LUN" property.
So the line
foreach($lun in $esx.Config.StorageDevice.MultipathInfo.Lun | where {$_.Lun -eq $disk.Key}){
will:
- place all entries from multiPath in the pipeline
- filter these objects so only the ones whose "LUN" property corresponds with the ScsiLun's "KEY" property
- pass each selected multiPath LUN to the code block with a foreach statement
I hope I didn't confuse you more :smileygrin:
Updated: nearly forgot to answer your datastore question.
Yes, that is possible.
Have a look at my LUN report – datastore, RDM and node visibility post where I do exactly that.
Your script would become something like this
# Function to create the headings for the output function New-Row{
param($hostname,$dsname, $diskname,$paths)
$row = "" | Select-Object VMHost, Datastore, DiskNAA, PathCount
$row.VMHost = $hostname
$row.Datastore = $dsname
$row.DiskNAA = $Diskname
$row.Pathcount = $paths
$row
}
$list = Get-Cluster | Get-VMHost
$datastore = @{}
foreach($ds in ($list | Get-Datastore | Sort-Object -Unique)){
if($ds.Extensiondata.Info.Vmfs){
$ds.Extensiondata.Info.Vmfs.Extent | %{
$datastore[$_.DiskName] = $ds.Name
}
}
}
$diskpaths =@()
foreach ($srv in $list){
$diskpaths += (New-Row $srv.Name $null $null $null)
$esx = $srv | Get-View
foreach($disk in $esx.Config.StorageDevice.ScsiLun){
foreach($lun in $esx.Config.StorageDevice.MultipathInfo.Lun | where {$_.Lun -eq $disk.Key}){
$diskpaths += (New-Row null $datastore[$disk.CanonicalName] $disk.CanonicalName $lun.Path.Count)
}
}
}
$diskpathsThe script first created a hash tab with the datastore names and as the key it uses the CanonicalName of each extent of the datastore.
Later on, the script uses the CanonicalName from each ScsiLun entry to find, if any, the corresponding datastore.
