[Webinar] Streamline your web hosting managementRegister Today

x
?
Solved

Multipath  question

Posted on 2010-04-05
9
Medium Priority
?
775 Views
Last Modified: 2013-11-14
Hi,

I have a  question about multipathing.  Does it mean more than one fiber connection to server from SAN storage?
0
Comment
Question by:mokkan
  • 2
  • 2
  • 2
  • +3
9 Comments
 
LVL 16

Accepted Solution

by:
Joseph Gan earned 576 total points
ID: 29861294
0
 

Author Comment

by:mokkan
ID: 29863019
It doesn't have detail info.  do  you know any other ink?
0
 
LVL 16

Assisted Solution

by:Joseph Gan
Joseph Gan earned 576 total points
ID: 29863611
What OS and SAN storage you are using ?
0
Receive 1:1 tech help

Solve your biggest tech problems alongside global tech experts with 1:1 help.

 
LVL 56

Assisted Solution

by:Handy Holder
Handy Holder earned 288 total points
ID: 29884421
Take a look at http://www.ibm.com/developerworks/br/technology/library/l-multipath-san-boot/figure2.gif

You can see that both controllers connect to both HBAs in the server so there are 4 paths from the storage to the server.
0
 

Author Comment

by:mokkan
ID: 29894849
We are using SUSE and storage is EMC CX600.
0
 
LVL 13

Assisted Solution

by:Rowley
Rowley earned 568 total points
ID: 29898244
Have a read of the attached doc for more details of EMC PowerPath and MPIO on Linux. Check on EMC's PowerLink for more info.

0
 
LVL 13

Assisted Solution

by:Rowley
Rowley earned 568 total points
ID: 29898389
The doc.
300-003-865.pdf
0
 
LVL 3

Assisted Solution

by:BlackAdderDK
BlackAdderDK earned 284 total points
ID: 30399732
Hi

To answer your question in a simplified manner; Yes!

It do means multiple/failover fiberconnections to your SAN - if you don't use a multipath driver, you will see the same device appear several times equal to the amount of fiberconnections

regards
'Adder
0
 
LVL 3

Assisted Solution

by:webbster20
webbster20 earned 284 total points
ID: 30402657
Multi-pathing is a simple, but tricky at the same time process. Equations are ran behind the scenes to determine correct paths and, at times, paths can change.

In order to provide data consistency, be sure to run some sort of MPIO managing software, whether it be from your Vendor, EMC, or another solution. Failure to do so can result in corrupted data due to two processes/threads accessing the same file twice and attempting to write it, similar to what would occur if you were to plug a hard drive in in two spots and have it work.

If you see multiple copies of the same LUN, please immediately call your Vendor for assistance with this matter.

FYI: If your multi-pathing is not functioning correctly it can and will hinder failover. Please ensure that zoning is correct and all paths are able to be used at a moment's notice.

The same applies for iSCSI, minus the zoning.
0

Featured Post

Get your problem seen by more experts

Be seen. Boost your question’s priority for more expert views and faster solutions

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Compliance and data security require steps be taken to prevent unauthorized users from copying data.  Here's one method to prevent data theft via USB drives (and writable optical media).
Among the most obnoxious of Exchange errors is error 1216 – Attached Database Mismatch error of the Jet Database Engine. When faced with this error, users may have to suffer from mailbox inaccessibility and in worst situations, permanent data loss.
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …
Suggested Courses

591 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question