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Dell EMC Metro node 7.1 Administrator Guide

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Compare and Write

The CompareAndWrite (CAW) SCSI command is used to coordinate VMware operations such as powering-on/off VMs, moving VMs from one ESX to another without halting applications (VMotion), and Distributed Resource Scheduler (DRS) operations.

CAW is used by VMware ESX servers to relieve storage contention, which may be caused by SCSI RESERVATION in distributed virtual machine environments. CAW assists storage hardware acceleration by allowing ESX servers to lock a region of disk instead of an entire disk.

Modern ESX servers use this strategy to increase the number of virtual machines that an ESX servers can host, and to increase the performance of those virtual machines.

Support for CAW is enabled by default.

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