#Datastore usage on disk alarm in vsphere 5.5 free#
It is possible for the vSphere layer to report sufficient free space when the underlying physical capacity is close to or entirely usedĤ. The storage may need to be monitored in multiple locations increasing BAU effortģ. If the storage at the vSphere and array level is not properly monitored, out of space conditions may occur which will lead to downtime of VMs requiring disk space although VMs not requiring additional disk space can continue to operate even where there is no available space on the datastoreĢ.
Thick provision the LUN and thin provision virtual machine disks (VMDKs)ġ. Thick provision the LUN and thick provision virtual machine disks (VMDKs)ģ. Thin Provision the LUN and thick provision virtual machine disks (VMDKs)Ģ. The VAAI UNMAP primitive provides automated space reclamation to reduce wasted space from files or VMs being deletedġ. Using Thin Provisioned LUNs with no actual over-commitment at the storage layer reduces any risk of out of space conditions while maintaining the flexibility and efficiency with significantly reduce risk and dependency on monitoring.ġ3. Where there is a real or perceved issue with performance, any VM can be converted to Thick Provisioned using Storage vMotion not disruptivley.ġ2. Thin provisioning leaves maximum available free space on the physical spindles which should improve performance of the storage as a wholeġ1. Eg: For Storage vMotion it eliminates the requirement for Storage vMotion (or the array when offloaded by VAAI XCOPY Primitive) to relocate “White space”ġ0. Thin provisioned VMs reduce the overhead for Storage vMotion, Cloning and Snapshot activities. The impact of SCSI reservations causing performance issues (increased latency) when thin provisioned virtual machines (VMDKs) grow is no longer an issue as the VAAI Atomic Test & Set (ATS) primitive alleviates the issue of SCSI reservations.ĩ. The time frame to order new hardware (eg: New Disk Shelves) is = 75% of its capacityĨ.
In a vSphere environment, What is the most suitable disk provisioning type to use for the LUN and the virtual machines to ensure minimum storage overhead and optimal performance?ġ. Ensure optimal storage capacity utilizationĢ. Ensure storage performance is both consistent & maximizedģ.
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