08-18-2009
It's very very strange. I have not found any kind of information about.
Could you post the next?:
lsmod | grep ^dm
uname -a
cat /etc/*release
cat /etc/multipath.conf
10 More Discussions You Might Find Interesting
1. HP-UX
# 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)
Discussion started by: bluepluto
1 Replies
2. UNIX for Dummies Questions & Answers
how to undef a readonly parameter? (2 Replies)
Discussion started by: tukuna82
2 Replies
3. Red Hat
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)
Discussion started by: kanna_geekworkz
2 Replies
4. Linux
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)
Discussion started by: tip78
7 Replies
5. Red Hat
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)
Discussion started by: fedora18
9 Replies
6. Red Hat
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)
Discussion started by: Ikaro0
1 Replies
7. Red Hat
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)
Discussion started by: Maddy123
2 Replies
8. Red Hat
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)
Discussion started by: linux.amrit
6 Replies
9. UNIX for Advanced & Expert Users
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)
Discussion started by: royalibrahim
2 Replies
10. Solaris
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 CENTOS
multipath
MULTIPATH(8) Linux Administrator's Manual MULTIPATH(8)
NAME
multipath - Device mapper target autoconfig
SYNOPSIS
multipath [-v verbosity] [-b bindings_file] [-d] [-h|-l|-ll|-f|-t|-F|-B|-c|-q|-r|-a|-A|-w|-W] [-p failover|multi-
bus|group_by_serial|group_by_prio|group_by_node_name] [device]
DESCRIPTION
multipath is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them
OPTIONS
-v level
verbosity, print all paths and multipaths
0 no output
1 print the created or updated multipath names only, for use to feed other tools like kpartx
2 + print all info : detected paths, coalesced paths (ie multipaths) and device maps
-h print usage text
-d dry run, do not create or update devmaps
-l show the current multipath topology from information fetched in sysfs and the device mapper
-ll show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...)
-f flush a multipath device map specified as parameter, if unused
-F flush all unused multipath device maps
-t print internal hardware table to stdout
-r force devmap reload
-B treat the bindings file as read only
-b bindings_file
set user_friendly_names bindings file location. The default is /etc/multipath/bindings
-c check if a block device should be a path in a multipath device
-q allow device tables with queue_if_no_path when multipathd is not running
-a add the wwid for the specified device to the wwids file
-A add wwids from any kernel command line mpath.wwid parameters to the wwids file
-w remove the wwid for the specified device from the wwids file
-W reset the wwids file to only include the current multipath devices
-p policy
force new maps to use the specified policy:
failover 1 path per priority group
multibus all paths in 1 priority group
group_by_serial
1 priority group per serial
group_by_prio
1 priority group per priority value. Priorities are determined by callout programs specified as a global, per-con-
troller or per-multipath option in the configuration file
group_by_node_name
1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name.
Existing maps are not modified.
device update only the devmap the path pointed by device is in. device is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or
major:minor format. device may alternatively be a multipath mapname
SEE ALSO
multipathd(8), multipath.conf(5), kpartx(8), udev(8), dmsetup(8) hotplug(8)
AUTHORS
multipath was developed by Christophe Varoqui, <christophe.varoqui@opensvc.com> and others.
July 2006 MULTIPATH(8)