From about version 5.0 onward, hotfixes on Storage Foundation generally refer to private fixes which are only available through support.
Couple of ways to check --
First, search on SORT for the etrack number:
https://sort.symantec.com/search?q=2600939
There are no results, which strongly suggests that the patch has not yet been included in a publically released patch.
Using a navigation approach through SORT's patchfinder:
https://sort.symantec.com/patch/finder
and then setting product=SF, version=5.1SP1
We see 5.1SP1RP2 which is a vxvm patch:
https://sort.symantec.com/patch/detail/5612
and looking through the "OSRI" section there are no newer patches for that branch listed at the time of writing this.
