Competitive access to storage

Hello

I have 2 guests (PowerEdge R710) running Oracle Enterprise Linux 5.7, access to a directly connected (PowerVault MD3200i) storage (no switch between the two). I also installed and configured the multipath.

Everything seems to work fine, until I noticed that when I make a change to the host-1 storage (for example: create a file) this change cannot be seen by host-2 all accessing the same storage (same directory)! In fact, the only way host-2 could see the change was after a reboot...

Can someone give me an indication of what I could do wrong?  :)
Thanks in advance.

Unless you use a global or cluster, the file system which is the expected behavior.   Each node is believes that she has this drive exclusively.  It does not periodically coordinate or review the content of the disc.  It's what we call a 'Double Mount".  It causes corruption in the long term, 100% certainty.  As a node selects a block to write, and the other node might use that one even.  Or if you restart a node will be served the State of the drive as he knows.

It must be addressed IMMEDIATELY.   On the 'inactive' node remove the power cord, do NOT stop the node.  Otherwise, cache will be served.  (or pull the cable network then stop)

On the active node, remove the partitions and run fsck on them.

Tags: Dell Tech

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