Multipath question


I have a  question about multipathing.  Does it mean more than one fiber connection to server from SAN storage?
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mokkanAuthor Commented:
It doesn't have detail info.  do  you know any other ink?
Joseph GanSystem AdminCommented:
What OS and SAN storage you are using ?
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You can see that both controllers connect to both HBAs in the server so there are 4 paths from the storage to the server.
mokkanAuthor Commented:
We are using SUSE and storage is EMC CX600.
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.

The doc.

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

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.
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