Wednesday, May 18, 2011

VMFS extents feature

When using the VMFS extents feature, VMFS metadata is stored in the first extent (LUN) of the VMFS volume. SCSI reservations are tied to VMFS metadata. The net effect of VMFS extents + SCSI reservations by metadata updates is that the SCSI reservations will only impact the first VMFS extent or LUN. Performance on the remaining extents or LUNs should not be impacted.
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