VMware VMFS Datastore Sizing Calculator

How to Use the calculator:

Input Fields :

Total Number of VMs : Enter total number of VMs in the Infrastructure
Number of VMs in Single VMFS Datastore : Min Value : 1 : Max Value : Follow the best practices usually 10-15 VMs
Total Disk Size for the VM (GB) : Enter combined disk size for all the disks the VM will have
Memory Assigned per VM (GB) : Enter the memory value , Max 1 TB
Total IOPS per VM : Enter your IOPS value for a given VM , for server virtualizations it’s usually 30-40 IOPS per VM
Read Ratio % :Enter your expected read ratio ,combined value with write should not be more than 100
Write Ratio % :Enter your expected write ratio,combined value with read should not be more than 100
RAID Level : Enter your appropriate RAID level , this will be used for calculating Write Penalty
Disk RPM : Enter the RPM value of the Disk

Output Value :

Total Size of a Single VMFS Datastore(GB) : Tells you the size of a Single VMFS volume , calculation takes into account snapshot and free space recommendations
Total No. VMFS datastores : Tells you how Many datastores you need with above mentioned capacity
Spindles Required for a Single Lun : Tells you how many disk spindles you require for a given Lun, value doesn’t take into account decimal calculations
Spindles Required for all the Luns : Tells you total spindles which is required in your environment for all the Luns