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MD (4) | Special files and drivers | Unix Manual Pages | :man

NAME

md - memory disk

CONTENTS

Synopsis
Description
See Also
History
Authors

SYNOPSIS


.Cd device md

DESCRIPTION

The md driver provides support for four kinds of memory backed virtual disks:
malloc Backing store is allocated using malloc(9). Only one malloc-bucket is used, which means that all md devices with malloc backing must share the malloc-per-bucket-quota. The exact size of this quota varies, in particular with the amount of RAM in the system. The exact value can be determined with vmstat(8).
preload
A file loaded by loader(8) with type 'md_image' is used for backing store. For backwards compatibility the type 'mfs_root' is also recognized. If the kernel is created with option MD_ROOT the first preloaded image found will become the root file system.
vnode A regular file is used as backing store. This allows for mounting ISO images without the tedious detour over actual physical media.
swap Backing store is allocated from swap space.

For more information, please see mdconfig(8).

SEE ALSO

disklabel(5), disklabel(8), fdisk(8), loader(8), mdconfig(8), mdmfs(8), newfs(8), vmstat(8)

HISTORY

vn(4)

AUTHORS


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