LUN Presentation Post: 302632047

Sponsored Content

Operating Systems Linux Red Hat LUN Presentation Post 302632047 by mark54g on Saturday 28th of April 2012 11:28:25 PM

04-29-2012

Registered User

If you have a /dev/dm device, you HAVE presented the LUN. This is the multipath daemon's way of abstracting the multiple paths as one device.

That way, assuming you had /dev/sdb, sdc, sdd, sde as 4 paths to the same disk, you would use /dev/dm-0 as the path you choose, and if you lose /dev/sdc then you still have 3 active paths and no loss in access, but perhaps performance

(Besides, an EVA only allows access via one controller at a time until a failure causes it to switch controllers. It's really the "Speak and Spell" of SAN technology)

In the Command View EVA tool you present the device to the WWN(s) of the host (You did properly zone the switch, correct?)

After that, you should follow the instructions on this page:

Scan and Configure New LUNS on Redhat Linux (RHEL)

If you are using native multipathing, run multipath -ll

Make sure the system sees all the paths. You can also create a disk lable with e2label (That way, when you run blkid, you can see which devices correspond to which path, etc without multipath -ll)

Tutorial: e2label, fdisk, /etc/fstab, mount, linux rescue, rescue disk, CentOS should help you there.

mark54g

View Public Profile for mark54g

Find all posts by mark54g

4 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

format date/time presentation

1) i am trying to print the timeframe of a log file using the start/end date/time being extracted from the file itself. my problem is how to convert the following numeric date format to the one that i prefer: Start time: 0204161129 End time : 0204171431 into: Start time: Apr 16 2002...

2. Solaris

I have LUN ID, how to find disk relate to that LUN ID?

I have a list of LUN ID, my task is to find if disk has been added or not. How do I do that? I have been searching the forum and not able to find answer. thanks

3. OS X (Apple)

Wireless presentation system for mac

I am a system developer for a major university and currently trying to find out WPS software for mac that can connect a mac to a wireless projector server. The software functions with Win OS XP and 7. The server is a EDIMAX WP-S1100 WIRELESS PROJECTOR SERVER.

4. Shell Programming and Scripting

Logs Presentation

Hello All, I am trying to capture system logs for specific tools run by users. So my script create logs from 10 different server.So is there any script & tool from that i can read or present them easily ?. Regards Ankit

LEARN ABOUT OPENSOLARIS

e2label

E2LABEL(8)                                                    System Manager's Manual                                                   E2LABEL(8)

NAME

       e2label - Change the label on an ext2/ext3/ext4 filesystem

SYNOPSIS

       e2label device [ volume-label ]

DESCRIPTION

       e2label will display or change the volume label on the ext2, ext3, or ext4 filesystem located on device.

       If the optional argument volume-label is not present, e2label will simply display the current volume label.

       If  the optional argument volume-label is present, then e2label will set the volume label to be volume-label.  Ext2 volume labels can be at
       most 16 characters long; if volume-label is longer than 16 characters, e2label will truncate it and print a warning message.

       It is also possible to set the volume label using the -L option of tune2fs(8).

AUTHOR

       e2label was written by Theodore Ts'o (tytso@mit.edu).

AVAILABILITY

       e2label is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net.

SEE ALSO

       mke2fs(8), tune2fs(8)

E2fsprogs version 1.44.1                                            March 2018                                                          E2LABEL(8)