Cormac Hogan from VMware has a very good blog about VMFS. He starts by general overview on VMFS locking. Which over my time in virtualisation is misunderstood more often than not .
Areas covered:
- Heartbeats
- On-disk Metadata Locks
- Optimistic Locking
- VAAI ATS (Atomic Test & Set)
The link below.
http://blogs.vmware.com/vsphere/2012/05/vmfs-locking-uncovered.html
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