Symmetrix device masking or
VCM devices are Symmetrix devices
that have been masked for visibility to certain hosts. The device
masking database (VCMDB), which holds device masking records,
typically resides on a small disk device (such as a 48-cylinder, 24 MB
device). For more information, see the
EMC Solutions Enabler
Symmetrix Device Masking CLI Product Guide.
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