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.\" -*- nroff -*-
.TH mdadd 8
.SH NAME
mdadd, mdrun, mdstop, mdop \- command set to manage md devices.
.SH SYNOPSIS
.BI mdadd
[options] [md_device] [block_device_1 block_device_2 ...]
.BI mdrun
[options] md_device
.BI mdstop
[options] md_device
.BI mdop
[options] md_device block_device
.SH DESCRIPTION
Md devices are virtual devices used to group real block devices. This
way, two 100MB disks can be used as a single 200MB disk, whatever
their interface type.
If you're using the
.B /proc
filesystem,
.B /proc/mdstat
gives you informations about md devices status.
Avaible commands are :
.br
.B mdadd
: groups several real devices into a virtual one.
.br
.B mdrun
: set a virtual device as usable, with a given mode.
.br
.B mdstop
: free real devices belonging to a virtual one, and flush buffers.
.br
.B mdop
: invalidate or revalidate a device belonging to a raid-1 device
.SH OPTIONS
.IP "\fI\-a\fP"
Apply the command to the set of devices described in \fB/etc/mdtab\fP.
.IP "\fI\-r\fP"
Starts the virtual device after the real devices are being added. Only
applicable to \fBmdadd\fP.
.IP "\fI\-px\fP"
where x is :
.br
.I l
: starts the device in linear mode,
.br
.B 0
: starts the device in raid-0 mode,
.br
.B 1
: starts the device in raid-1 mode.
.br
assuming that the mode is either compiled into the kernel or loaded
using the \fBinsmod\fP program. Only applicable to \fBmdrun\fP.
.IP "\fI\-cn\fP"
(raid-0 and raid-1 only)
.br
Set the chunk size as \fBPAGE_SIZE << n\fP. You can also set the chunk
size in kilobytes with \fB\-cxk\fP where x is a power of 2. Only
applicable to \fBmdrun\fP.
.IP "\fI\-fn\fP"
(raid-1 only)
.br
Set the maximum fault number as \fBn\fP. Only applicable to
\fBmdrun\fP.
.IP "\fI-i\fP"
(raid1 only)
.br
Invalidate a physical device belonging to a raid-1 device. Only
applicable to \fBmdop\fP.
.IP "\fI-v\fP"
(raid1 only)
.br
Revalidate an invalidated physical device belonging to a raid-1 device. Only
applicable to \fBmdop\fP.
.IP "\fI-V\fP"
Show version number as well as driver version the command is compiled for.
.SH EXAMPLES
To configure the device :
.B /sbin/mdadd /dev/md0 /dev/sdb1 /dev/sdc2
Warning,
.B /sbin/mdadd /dev/md0 /dev/sdb1 /dev/sdc2
is different from
.B /sbin/mdadd /dev/md0 /dev/sdc2 /dev/sdb1
because there's no internal ordering.
To make it usable in linear mode :
.B /sbin/mdrun -pl /dev/md0
To make it usable in striped mode, with 8kb chunks :
.B /sbin/mdrun -p0 -c8k /dev/md0
To stop it :
.B /sbin/mdstop /dev/md0
If you have described you md-devices in
.BI /etc/mdtab
, you can replace the two first steps with
.B /sbin/mdadd \ -ar
.SH FILES
.BI /sbin/mdadd
: main command. Other commands are symlinks to this file.
.br
.BI /etc/mdtab
: configuration file.
.br
.BI /proc/mdstat
: driver and devices status
.SH AUTHOR
.B mdadd
was written as a kernel interface to md driver by Marc ZYNGIER
<zyngier@amertume.ufr-info-p7.ibp.fr>.
.SH BUGS
Options that are not applicable to a command are silently ignored
and/or may lead to unxepected behaviour. This man page (and the whole
documentation) is really brain-dead and should be rewritten. Any
volunteer ?
.SH SEE ALSO
.BR mdtab "(5)
.br
.BR modules
package.
.br
More informations in the README file included in the package.
|
