Well, that is a question which raises more.
Will you use replication? (If so there will be snapshots) Do you plan to use snapshots in general?(multiple external applications can/may/will use snapshots) What type of volumes will you use? What sparring level are you using and what is the hardware config?(nodes, cages,drives) How many drives can you accept failing before replacing and rebuilding? (naturally simulatious failures are decided by RAID level)
Answer «correct» on all of these and you can safely use ~100%, answer «wrong» and it could be way less. The only Best Practice (which is the general advise for the general use case) is always ensure you add more drives before you go full.
_________________ The views and opinions expressed are my own and do not necessarily reflect those of my current or previous employers.
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