Close Sync on file systems option (ie when the app calls close the file is flushed, including mmap, no data loss of closed files on system crash) Atomic/Locked operations across all pools e.g. snapshot all or selected pools at the same time. Allowance for offline files, eg. first part of a file can be on disk, the last part can be on disk, the rest on tape/cd/dvd/blue-ray etc.
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