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

NAME
cache_repair - repair cache binary metadata from device/file to device/file SYNOPSIS
cache_repair [options] -i {device|file} -o {device|file} DESCRIPTION
cache_repair reads binary cache metadata created by the respective device-mapper target from one device or file , repairs it and writes it to another device or file. If written to a metadata device , the metadata can be processed by the device-mapper target. -i, --input {device|file} Input file or device with binary metadata. -o, --output {device|file} Output file or device for repaired binary metadata. -h, --help Print help and exit. -V, --version Output version information and exit. EXAMPLE
Reads the binary cache metadata from file metadata , repairs it and writes it to logical volume /dev/vg/metadata for further processing by the respective device-mapper target: cache_repair -i metadata -o /dev/vg/metadata DIAGNOSTICS
cache_repair returns an exit code of 0 for success or 1 for error. SEE ALSO
cache_dump(8) cache_check(8) cache_restore(8) AUTHOR
Joe Thornber <ejt@redhat.com> Heinz Mauelshagen <HeinzM@RedHat.com> Red Hat, Inc. Thin Provisioning Tools CACHE_REPAIR(8)
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