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Full Discussion: Info on /dev/dm files
Operating Systems Linux Red Hat Info on /dev/dm files Post 302662939 by mark54g on Wednesday 27th of June 2012 10:42:30 AM
Old 06-27-2012
it is part of device mapper, and used by LVM among other things like storage connected via some sort of SAN.

It is used for consistent naming, rather than going to individual drives.
 

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THIN_RESTORE(8) 					      System Manager's Manual						   THIN_RESTORE(8)

NAME
thin_restore - restore thin provisioning metadata file to device or file SYNOPSIS
thin_restore [options] -i {device|file} -o {device|file} DESCRIPTION
thin_restore restores thin provisioning metadata created by the respective device-mapper target dumped into an XML formatted (see thin_dump(8)) file , which optionally can be preprocessed before the restore to another device or file. If restored to a metadata device , the metadata can be processed by the device-mapper target. -i, --input {device|file} Input file or device with metadata. -o, --output {device|file} Output file or device. -h, --help Print help and exit. -V, --version Output version information and exit. EXAMPLE
Restores the XML formatted thin provisioning metadata on file metadata to logical volume /dev/vg/metadata for further processing by the respective device-mapper target: thin_restore -i metadata -o /dev/vg/metadata DIAGNOSTICS
thin_restore returns an exit code of 0 for success or 1 for error. SEE ALSO
thin_dump(8) thin_check(8) thin_repair(8) thin_rmap(8) thin_metadata_size(8) AUTHOR
Joe Thornber <ejt@redhat.com> Heinz Mauelshagen <HeinzM@RedHat.com> Red Hat, Inc. Thin Provisioning Tools THIN_RESTORE(8)
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