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VCDX Enterprise Admin Notes: VMFS Reservation

by Harley Stagner on December 14, 2009

Today’s VCDX note is just a general note about VMFS volume SCSI-2 Reservations. As you may know, VMFS is a clustered file system. It allows multiple hosts to read and write to the same VMFS volume simultaneously. This is accomplished through a mechanism called distributed lock handling. Distributed lock handling locks individual files instead of an entire VMFS volume.

For example, file locks are put on files associated with a VM so that it can only be powered on by one host at a time. However, there are occasions that the entire volume must be reserved using a SCSI-2 Reservation (e.g. a VMFS volume Metadata update). The short video below shows how you can observe this behavior in your own testing by administratively locking the VMFS volume with the vmkfstools command.

{ 2 trackbacks }

2vcps and a Truck » ESX Commands – Summary
December 22, 2009 at 8:25 pm
Shared VMFS Volumes on non-clustered hosts | VM's Are Free, Right?
April 22, 2011 at 1:51 pm

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