# ioscan -f | grep disk
Class I H/W Path Driver S/W State H/W Type Description
disk 3 0/0/2/0.0.0.0 sdisk CLAIMED DEVICE TEAC DV-28E-N
disk 1 0/1/1/0.0.0 sdisk CLAIMED DEVICE HP 146 GST3146707LC ... (1 Reply)
Hi,
I had a doubt regarding device mapper notations and their corresponding LVM volumes.
I have configured a volume group with two logical volumes in it as root and swap.
The entries in the /etc/fstab file show the dm notations namely,
/dev/mapper/VolGroup00-LogVol01... (2 Replies)
hello
my centOS newly installed system loading dmraid modules on startup
I did remove all LVM/raid things from system installation menus and after installation too but dmraid is still there
and he says: no raid disks found
also I did modprobe -r dm_raid45 and it do remove it but only until... (7 Replies)
Hi,
I have a server program that reads data coming in on USB ports. Device paths are in the format: /dev/ttyUSB0
Now, I would like to log data from another device coming in over Ethernet. My first step is trying to track down what the correct device path is which I am unsure of.
Anyone... (9 Replies)
Good morning
Recently we needed to change the password from a redhat 6.5 system that no one knew the root password.
Starting the system with the init=/bin/bash method took us to the following scenario:
system_vg active with only root_lv and tmpfs mounted.
our entries at fstab are like... (1 Reply)
Hi,
How to find the raw device/multipath details of the LUN used by the diskgroups of the database.
file system type -- ASM
Oracle -- 11.2.0.3.0
OS -- Linux
This is RAC database.
Regards,
Maddy (2 Replies)
Hi,
I am testing on iSCSI + multipath, where i have one iSCSI lun assigned to one server.
mpatha (1IET 00010001) dm-2 IET,VIRTUAL-DISK
size=100M features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 2:0:0:1 sda 8:0 active ready running
`-+-... (6 Replies)
Currently I am using this laborious command
lvdisplay | awk '/LV Path/ {p=$3} /LV Name/ {n=$3} /VG Name/ {v=$3} /Block device/ {d=$3; sub(".*:", "/dev/dm-", d); printf "%s\t%s\t%s\n", p, "/dev/mapper/"v"-"n, d}'
Would like to know if there is any shorter method to get this mapping of... (2 Replies)
Hello,
I am trying to setup a storage server with salvaged equipments:
QSSC-S4R server, with QLogic 2562 FC HBA's
Clariion KTN-STL4 4GB FC Enclosures
Disks Salvaged from EMC Vmax
Disks are 520B sector size so i converted to 512B in linux environment and create multipath successfully. But... (4 Replies)
Discussion started by: amd103
4 Replies
LEARN ABOUT SUSE
multipathd
MULTIPATHD(8) System Manager's Manual MULTIPATHD(8)NAME
multipathd - multipath daemon
SYNOPSIS
multipathd [options]
DESCRIPTION
The multipathd daemon is in charge of checking for failed paths. When this happens, it will reconfigure the multipath map the path belongs
to, so that this map regains its maximum performance and redundancy.
This daemon executes the external multipath config tool when events occur. In turn, the multipath tool signals the multipathd daemon when
it is done with devmap reconfiguration, so that it can refresh its failed path list.
OPTIONS -d Forground Mode. Don't daemonize, and print all messages to stdout and stderr.
-v level
Verbosity level. Print additional information while running multipathd. A level of 0 means only print errors. A level of 3 or
greater prints debugging information as well.
-k multipathd will enter interactive mode. From this mode, the available commands can be viewed by entering "help". When you are fin-
ished entering commands, press CTRL-D to quit.
COMMANDS
The following commands can be used in interactive mode:
list|show paths
Show the paths that multipathd is monitoring, and their state.
list|show maps|multipaths
Show the multipath devices that the multipathd is monitoring.
list|show maps|multipaths status
Show the status of all multipath devices that the multipathd is monitoring.
list|show maps|multipaths stats
Show some statistics of all multipath devices that the multipathd is monitoring.
list|show maps|multipaths topology
Show the current multipath topology. Same as "multipath -ll".
list|show topology
Show the current multipath topology. Same as "multipath -ll".
list|show map|multipath $map topology
Show topology of a single multipath device specified by $map, e.g. 36005076303ffc56200000000000010aa. This map could be obtained
from "list maps".
list|show config
Show the currently used configuration, derived from default values and values specified within the configuration file /etc/multi-
path.conf.
list|show blacklist
Show the currently used blacklist rules, derived from default values and values specified within the configuration file /etc/multi-
path.conf.
list|show devices
Show all available block devices by name including the information if they are blacklisted or not.
add path $path
Add a path to the list of monitored paths. $path is as listed in /sys/block (e.g. sda).
remove|del path $path
Stop monitoring a path. $path is as listed in /sys/block (e.g. sda).
add map $map
Add a multipath device to the list of monitored devices. $map can either be a device-mapper device as listed in /sys/block (e.g.
dm-0) or it can be the alias for the multipath device (e.g. mpath1) or the uid of the multipath device (e.g.
36005076303ffc56200000000000010aa).
remove|del map $map
Stop monitoring a multipath device.
resize map|multipath $map
Resizes map $map to the given size
switch|switchgroup map $map group $group
Force a multipath device to switch to a specific path group. $group is the path group index, starting with 1.
reconfigure
Reconfigures the multipaths. This should be triggered automatically after any hotplug event.
suspend map|multipath $map
Sets map $map into suspend state.
resume map|multipath $map
Resumes map $map from suspend state.
fail path $path
Sets path $path into failed state.
reinstate path $path
Resumes path $path from failed state.
disablequeueing map|multipath $map
Disabled queuing on multipathed map $map
restorequeueing map|multipath $map
Restore queuing on multipahted map $map
SEE ALSO multipath(8)kpartx(8)hotplug(8)AUTHORS
multipathd was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.
Linux Administrator's Manual November 2009 MULTIPATHD(8)