Turns out the fix for the hanging backups we were experiencing with the latest Solaris 10 patch cluster with NBU5.1MP6 were indeed related to the ip:do_tcp_fusion kernel parameter. Although Sun claims this bug was fixed in 118833-24, it still exists in 118833-36. The suggestion was to turn it off according to this document:
http://sunsolve.sun.com/search/document.do?assetkey=1-9-87866-1 We weren't seeing any of the error messages that the document describes, but the fix seems to work! Thanks to all who replied. Eric
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