Visit Our UNIX and Linux User Community

DM multipath :iscsi lun shows by diff names on two server where its exported

Thread Tools Search this Thread
Operating Systems Linux Red Hat DM multipath :iscsi lun shows by diff names on two server where its exported
# 1  
Old 11-03-2013
DM multipath :iscsi lun shows by diff names on two server where its exported


I am trying to setup multipathing (using DM multipath) for a redhat cluster setup ...all setup is done but issue is :

node 1 shows the shared iscsi lun as sdc
node 2 shows the same as sdg (changes on reboots)

Due to this (i guess) i get i/o error & i can not read files created by other node. eg

[root@rh600 Packages]# cd /var/www/html/
[root@rh600 html]# ls
ls: cannot access index.html: Input/output error
index.html  lost+found  test
[root@rh600 html]#
[root@rh500 html]# ls -l
ls: cannot access index.html: Input/output error
total 13
-????????? ? ?    ?        ?            ? index.html
drwxrwxrwx 2 root root 12288 Nov  2 21:32 lost+found
-rw-r--r-- 1 root root     5 Nov  2 21:39 test
[root@rh500 html]#

Anyone knows work-around for this ?

Thanks in advance

Last edited by Scrutinizer; 11-03-2013 at 09:01 AM.. Reason: code tags added

Previous Thread | Next Thread
Test Your Knowledge in Computers #317
Difficulty: Easy
Ada Lovejoy is often considered the first computer programmer.
True or False?

10 More Discussions You Might Find Interesting

1. Solaris

Restore of Netapp FC lun targets used as the disks for a zpool with exported zfs file systems

So, We have a Netapp storage solution. We have Sparc T4-4s running with LDOMS and client zones in the LDOMS, We are using FC for storage comms. So here's the basic setup FC luns are exported to the primary on the Sparc box. using LDM they are then exported to the LDOM using vdisk. at the... (4 Replies)
Discussion started by: os2mac
4 Replies

2. Solaris

Make an iSCSI LUN clone bootable

trying to do this for a DR situation. I've cloned an iSCSI LUN to another server. I've created an LDOM on it. set the LDOM to auto-boot=false and exported the LUN as a raw disk to the new LDOM. After starting the LDOM and telnetting to it. I can get to the OK prompt and see the disk but when I try... (2 Replies)
Discussion started by: os2mac
2 Replies

3. AIX

Netapp iscsi lun

Hi, I have aix 6.1 box. I want to configure iscsi luns from netapp storage. I tried in google but not getting proper solution for that. i m not getting the proper iqn name. Please share me the steps to complete this requirements. Thanks in advance. (1 Reply)
Discussion started by: sunnybee
1 Replies

4. UNIX for Dummies Questions & Answers

Diff shows only the same content

Hi All, Sorry this might be real dummy question. I have been searching from internet and diff manual, but not found any answer . By using diff command, how do we display the same content only (from both 2 files in 2 coloumns). Here is the diff -y output ... (2 Replies)
Discussion started by: wilsonSurya
2 Replies

5. AIX

Any tips to grow iSCSI LUN

Hi, I have an iSCSI LUN attached to an AIX 5.3 box. It's initial size is 250GB, I just grew it on the SAN to 300GB, but AIX is not seeing the change. Right now I have some processes going and it's eating up the disk space. I need to grow this lun by atleast 30GB otherwise the process with bomb... (5 Replies)
Discussion started by: bbbngowc
5 Replies

6. AIX

exported filesystems on a NIM server

I have a filesystem that was exported sometime in the past, probably by NIM processes, but cannot be unexported now. How can I get rid of this? Any ideas? I tried rebooting and it survived it. hostname:/:$ exportfs -v /usr/lpp/bos.sysmgt/nim/methods... (2 Replies)
Discussion started by: kah00na
2 Replies

7. Solaris

Solaris10 -> iscsi -> equiliogic lun

We "lose" the iscsi device after a reboot - i.e., it appears in /dev/rdsk and /dev/dsk but format cannot find it. Obviously, it won't mount either. This happens for two separately defined luns. We must be missing a step in iscsiadm. The luns are defined as targets, we can see them in... (2 Replies)
Discussion started by: jim mcnamara
2 Replies

8. Solaris

Set up iscsi LUN on solaris 9?

Hi, I need to set up iscsi LUN on Solaris 9. I've done it on Solaris 10 with iscsiadm. How do you do it on Solaris 9 though? Currently using Solaris 9 update 2. Your help is appreciated. Thanks, Sparcman (6 Replies)
Discussion started by: sparcman
6 Replies

9. UNIX for Dummies Questions & Answers

Copying dir (and sub dir) file names from ftp server to txt file in diff server

Hey all, i want to copy only the file names from an ftp server (directory and all sub directory) to a text file in another server (non ftp), i.e. i want to recursively move through directories and copy only the names to a text file. any help is appreciated...thank you in advance (1 Reply)
Discussion started by: deking
1 Replies

10. AIX

Help growing iscsi lun

Hi, I have an iSCSI LUN of 200GB. I increased it to 250GB and when I try to increase the size of the vg, I'm getting an error that none of the volumes have increased in size. How can I get the OS to see the additional 50GB? ---------- Post updated at 03:22 PM ---------- Previous update... (9 Replies)
Discussion started by: bbbngowc
9 Replies
MULTIPATH(8)						   Linux Administrator's Manual 					      MULTIPATH(8)

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, <> and others. July 2006 MULTIPATH(8)

Featured Tech Videos