lsraid is a program for querying Linux md devices. It can describe
the composite device and the block devices that belong to it. It can
also provide a description of the md device suitable for including in
the /etc/raidtab configuration file.
lsraid also has the ability to operate on online and offline devices.
It can read an online device via the kernel interface and provide
information about it. When a device is offline, lsraid can look at
any of the block devices that are a part of the md device and read the
persistent md superblock for information.
OPTIONS
-A
Selects array-based operation. lsraid will query the given devices
and output a short listing of the referenced md devices.
-a <device>
Adds md device <device> to the list of devices to query. If the
device is online, lsraid will discover all of the block devices that
belong to it via the kernel interface. Otherwise lsraid will only
be able to verify that the device exists.
-D
Selects disk-based operation. lsraid will query the given devices
and then output a description of all the member disks requested.
-d <device>
Adds block device <device> to the list of devices to query.
lsraid will read the md superblock off of <device> and use
it to discover the assocated md device and block devices.
-f
Displays only failed block devices in array-based mode (-A).
-g
Displays only good block devices in array-based mode (-A).
-h, --help
Displays a short usage message, then exits.
-l
Displays a long dump of block device superblocks in disk-based mode
(-D). This output is verbatim from the on-disk md superblock, and
reflects the state on the specific disk, not the state the md device
currently considers authorative.
-p
Scans all block devices in /proc/partitions for RAID arrays. This can
be slow in the presence of network block devices and the like. This
option is mutually exclusive with the -a and -d options.
-R
Selects raidtab operation. lsraid will query all the devices
specified and output a description of the referenced md devices in
a format suitable for placing in a raidtab(5) file.
-s
Displays only spare block devices in array-based mode (-A).
NOTES
lsraid cannot discover the block devices that make up an offline
md device. Providing one of the member devices with the -d option
allows lsraid to discover the rest of the information about the
offline md device.
Disk-based operation only displays the block devices specified on the
command line. Specify the md device on the command line to see
information about all of the member disks. If the md device is offline,
specify both the md device and one of the member disks.
lsraid does not do any special handling of md devices composed of
other md devices (eg RAID 1+0). The member devices are merely treated
as block devices while in the context of the parent device. This is
only an issue for raidtab-based operation. The raidtab(5) output
will be printed in the order the md devices are queried. This means
that a command creating a raidtab(5) for a RAID 1+0 device should
list the member devices first on the command line.
EXAMPLES
lsraid -A -a /dev/md0
Display a short listing of the md0 device.
lsraid -A -d /dev/sda1
Display a short listing of the array that sda1 belongs to.
lsraid -A -f -a /dev/md0
Display the failed devices belonging to the md0 device.
lsraid -D -l -a /dev/md0
Display a long dump of the on-disk md superblock of every disk in md0.
lsraid -D -a /dev/md0 -d /dev/sda1
Display a short discription of the disks in md0 as well as a short
description of the disk sda1. sda1 will only be described once if it
belongs to md0.
lsraid -R -a /dev/md0 -a /dev/md1 -a /dev/md2
Display a description of the arrays in an output format suitable for
using in raidtab(5) files. Note that if md0 and md1 are raid0 arrays
and md2 is a raid1 created from md0 and md1, this command will output
the information in the correct order.
lsraid -R -p
Scan all block devices in /proc/partitions and display all discovered
md devices in a format suitable for using in raidtab(5) files.
