Sstrutt: /* Set LUN Multipathing */ Linked to RR IOPS

2012-03-13T14:34:49Z

Set LUN Multipathing: Linked to RR IOPS

← Older revision		Revision as of 14:34, 13 March 2012
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	The above came from Troy Clavell's post to be found at http://communities.vmware.com/thread/339480		The above came from Troy Clavell's post to be found at http://communities.vmware.com/thread/339480

	Note that you should also set the IOPS per path to 1 (default is 1000), there is some debate as to whether you should do this or not, HP recommend it for their SAN's, though some worry about the overhead on the ESX caused by switching paths for every IO. The choice is yours, though for further reading ~~and how to do it~~...		Note that some SAN vendors recommend that you should also set the IOPS per path to 1 (default is 1000), there is some debate as to whether you should do this or not, HP recommend it for their SAN's, though some worry about the overhead on the ESX caused by switching paths for every IO. The choice is yours, though for further reading...
			* [[Configuration_Considerations_(ESX)#Round_Robin_IOPS_Load_Balancing\|Round Robin IOPS Load Balancing]]
	* http://h20195.www2.hp.com/V2/GetDocument.aspx?docname=4AA1-2185ENW&cc=us&lc=en - HP's best practice		* http://h20195.www2.hp.com/V2/GetDocument.aspx?docname=4AA1-2185ENW&cc=us&lc=en - HP's best practice
	* http://www.yellow-bricks.com/2010/03/30/whats-the-point-of-setting-iops1/

	[[Category:PowerCLI]]		[[Category:PowerCLI]]
	[[Category:Storage]]		[[Category:Storage]]

Sstrutt: Initial creation - content from PowerCLI One-Liners page

2012-01-26T14:44:34Z

Initial creation - content from PowerCLI One-Liners page

New page

== Get VMDKs ==
Get the virtual HD (VMDK) details for a particular VM
<source lang="powershell"> Get-VM -Name "MyVM" | Get-HardDisk | Format-List </source>

Get the VMDK details for a particular VM (as seen from within guest OS)
<source lang="powershell"> (Get-VM -name "MyVM" | Get-VMGuest).Disks </source>

Get the VMDK details for all VM’s in a folder (sorted by VMDK path)
<source lang="powershell"> Get-VM -Location (Get-Folder -Name "MyFolder") | Get-HardDisk | sort-object -Property Filename </source>

== List VM RDMs ==
List VM Raw Device Mapping (RDM) disks
<source lang="powershell"> Get-VM | Get-HardDisk -DiskType "RawPhysical","RawVirtual" | Select Parent,Name,CapacityKB,Filename,ScsiCanonicalName,DeviceName </source>

== Create PowerShell drive ==
Create a PowerShell drive for the ''MyDatastore'' datastore
<source lang="powershell"> New-PSDrive -Name DS -PSProvider ViMdatastore -Root '\' -location (Get-Datastore MyDatastore) </source>

== Upload file to datastore ==
Upload file to datastore (a PowerShell drive needs to be create 1st - see above)
<source lang="powershell"> Copy-DatastoreItem C:\Temp\FileToUpload.vmdk -Destination DS:\VMFolder\ </source>

== List LUN Multipathing ==
List all disk multipathing
<source lang="powershell"> Get-VMHost | Get-ScsiLun | Select VMHost,Vendor,Model,LunType,CapacityMB,RuntimeName,MultipathPolicy,CanonicalName | Export-Csv lunpath.csv </source>

== Set LUN Multipathing ==
Set all SCSI disks to use round robin multipathing
<source lang="powershell"> Get-VMHost | Get-ScsiLun -LunType disk | Set-ScsiLun -MultipathPolicy "roundrobin" </source>
The above came from Troy Clavell's post to be found at http://communities.vmware.com/thread/339480

Note that you should also set the IOPS per path to 1 (default is 1000), there is some debate as to whether you should do this or not, HP recommend it for their SAN's, though some worry about the overhead on the ESX caused by switching paths for every IO. The choice is yours, though for further reading and how to do it...
* http://h20195.www2.hp.com/V2/GetDocument.aspx?docname=4AA1-2185ENW&cc=us&lc=en - HP's best practice
* http://www.yellow-bricks.com/2010/03/30/whats-the-point-of-setting-iops1/

[[Category:PowerCLI]]
[[Category:Storage]]

Storage PowerCLI One-Liners - Revision history

Sstrutt: /* Set LUN Multipathing */ Linked to RR IOPS

Sstrutt: Initial creation - content from PowerCLI One-Liners page