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When the LUN is extended online, why the new size of the LUN is not getting reflected in multipath layer ?

Solution Verified - Updated 2014-06-11T04:32:27+00:00 -

Issue

After resizing a LUN online the new size is not getting reflected in multipath layer.
multipath device has been increased from storage side as could be seen in multipath -ll command output, however 'df' command still shows the old size of the filesystem.

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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