TheBobkin
Champion
Champion

Hello Aquila,

Summary of each disk-type:

Thin: Allocate and zero on first write

Thick Lazy: Allocate in advance and zero on first write

Thick Eager: Allocate and zero in advance

rickardnobel.se/eager-thick-vs-lazy-thick-disk-performance/

When to use one over another should be based on the requirements of the VM/Application using the disks -

Do you want to save space?

Do they need the best disk performance possible?

Do they have a high rate of data change?

Some applications (such as those using multi-writer flag) have a requirement for Thick Eager-zeroed disks such as Oracle RAC:

kb.vmware.com/kb/1034165

Other applications also advise using Eager-zeroed for databases such as SAP:

vmware.com/files/pdf/solutions/sap/sap-solutions-on-vmware-best-practices-guide.pdf

So essentially it comes down to what you are using these disks for and which attributes take priority.

Bob

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