Controlling the Use of Images & Volumes80 Client Volume Overlay FilesClient Volume Overlay FilesIn the Image Manager system, a client mounts a server-based virtualdisk drive (volume) consisting of a hard disk image file and a pair ofClient Volume Overlay (CVol) files. The CVol files are createdautomatically by Neoware Image Manager Server based on settingsin the hard disk image configuration file. Each client will have itsown unique pair of CVol files: a header file that specifies how theclient uses the volume, and a write overlay file used to store datawritten by the client.The name of the CVol files incorporates the name of the hard diskimage volume and the MAC address of the client. The data file willhave the same name as the header file but with the file extension.dat.@ (CVol header file)@.dat (CVol data file)For example, a client using the volume named testdisk could havea pair of CVol files named as follows:testdisk@00E0C554E700 (CVol header file)testdisk@00E0C554E700.dat (CVol data file)The volume name that is used is the one defined in the server config-uration file. It is usually the name of the image file without the .volsuffix.The CVol header file specifies the write mode that is used when theclient mounts the volume. This mode affects the way in which datawritten by the client is handled. Refer to the section “Volume WriteModes” on page 82 for details.You can merge the contents of a CVol data file with a hard diskimage file in order to create a new hard disk image file. This isdescribed in the chapter “Merging Image & CVol Files” onpage 177.
