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Defragmentation of Disk Drives
Host disks, virtual disks and guest disks all affect the performance of VMware Workstation. See Defragmenting Virtual Disks for the procedures.
Host Hard Drives
Performance is weakened by fragmentation on the physical disk holding the virtual machine's working directory or virtual disk files. Fragmentation of the host disk can affect any or all of the following:
If you are experiencing slow disk performance in the virtual machine, or if you want to improve the speed of suspend and resume operations, check to be sure the host disk that holds the virtual machine's working directory and virtual disk files is not badly fragmented. If it is fragmented, you can improve performance by running a defragmentation utility to reduce fragmentation on that host disk.
Use the Workstation application to defragment virtual disks. See Defragmenting Virtual Disks.
Guest Operating System Drives
It is strongly recommended that you defragment using a guest operating system mechanism before taking the first snapshot (or linked clone).
Performance Impact of Defragmenting Snapshots and Linked Clones
There may be a performance impact when you defragment a linked clone or a virtual machine with a snapshot. Exact performance degradation depends on:
Defragmentation tends to make the redo file grow. The redo file itself can become defragmented with respect to the host file system. If your use of virtual machines is strongly performance oriented, you should avoid defragmenting or using linked clones and snapshots.