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=== Concurrent input / output (CIO) === JFS normally applies read-shared, write-exclusive locking to files, which avoids data inconsistencies but imposes write serialization at the file level. The CIO option disables this locking. Applications such as relational databases which maintain data consistency themselves can use this option to largely eliminate filesystem overheads.<ref>{{cite web|url=http://www.ibm.com/servers/aix/whitepapers/db_perf_aix.pdf|title=Improving Database Performance With AIX Concurrent I/O - White Paper|website=IBM.com|publisher=[[IBM]]}}</ref>
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