TW

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real-world performance (I backupped some directory from SSD to SSD, both with hot fs cache): ## aes256-ctr + hmac-sha256 Duration: 3 minutes 53.82 seconds Number of files: 1461 4.97 GB...

note: ocb mode shall be added in openssl 1.1.0, which is not released yet.

from wikipedia: http://en.wikipedia.org/wiki/OCB_mode#Attacks -> 64GB limitation per key :(

there is only one static key per repo, which is used for all backups. there is no "backup session" key, in case you mean that. attic uses aes-ctr mode (and...

Likely your fs does not support fcntl.lockf (with LOCK_EX to get an exclusive lock). An idea would be to implement (or reuse) a different way of locking, e.g. directory based....

@jasontbradshaw that was a locally mounted zfs? which OS precisely? Just wondering: considering the amount of stuff ZFS does support, it would seem strange it does not support such simple...

Ah, NFS, that explains it. For NFS, maybe running lockd would help? About the state of locking in general: http://0pointer.de/blog/projects/locking.html

@feboss @jasontbradshaw ^^^ can you try?