I don't know if there's other folks out there using Spectrum Scale with mmbackup to Spectrum Protect, but we've been frustrated by the fact that it doesn't have a preview mode like the SP client has with PREVIEW BACKUP. I submitted a RFE people can vote on if it's a useful feature for others:
https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=153520 -- -- Skylar Thompson (skyl...@u.washington.edu) -- Genome Sciences Department (UW Medicine), System Administrator -- Foege Building S046, (206)-685-7354 -- Pronouns: He/Him/His