Technical Specifications
| Year 2038 Safe | Yes |
| Timestamp Granularity | 100ns (UNIX Epoch) |
| Rx Listener Thread Throughput | <= 8.2 gbit/second |
| Rx Listener Threads per Service | up to 16 |
| Rx Window Size (default) | 128 packets or 180.5KB |
| Rx Window Size (maximum) | 65535 packets or 190.2MB |
| Rx Congestion Windows Validation | Yes |
| Volume IDs per Cell | 264 |
| Object IDs per Volume | 295 directories and 295 files |
| Maximum Distributed DB Size | 16 exabytes (264 bytes) |
| Access Control Lists | Per Object |
| Access Control Entries (ACE) per ACL | > 400 |
| Directory ACL Inheritance | Yes |
| Volume Access Control Policies | Yes |
| Mandatory Locking | Yes |
| GSS Authentication (YFS-RxGK) | Yes |
| AES-256/SHA-1 Wire Privacy | Yes |
| AES-256/SHA-2 Wire Privacy (RFC8009) | Yes |
| Mandatory Security Levels* | Yes |
| Cache Poisoning Attacks Protection | yfs-rxgk: Yes; rxkad: No |
| Combined Identity Tokens (user@device) | yfs-rxgk:Yes; rxkad: No |
| Perfect Forward Secrecy | yfs-rxgk:Yes; rxkad: No |
| Secure Callback Connections | yfs-rxgk:Yes; rxkad: No |
| Default Volume Quota | 20 GB |
| Maximum Assignable Quota | 16 zettabytes (274 bytes) |
| Maximum Reported Volume Size | 16 zettabytes (274 bytes) |
| Maximum Volume Size | 16 zettabytes (274 bytes) |
| Maximum Transferable Volume Size | 16 zettabytes (274 bytes) |
| Maximum Partition Size | 16 zettabytes (274 bytes) |
| Servers run unprivileged | Yes |
| UBIK quorum initial establishment | 23 to 40 seconds |
| UBIK quorum establishment after coordinator restart | 1 second |
| UBIK quorum establishment after coordinator shutdown | <= 56 seconds |
| UBIK servers per cell (usable) | Up to 80 |
| UBIK voting clones | Yes |
| UBIK non-voting clones | Yes |
| UBIK server ranking | Arbitrary order |
| POSIX O_DIRECT support | Yes |
| IBM AFS 3.6 client support | Yes (AFS3 protocol only) |
| OpenAFS 1.x client support | Yes (AFS3 protocol only) |
| IBM AFS 3.6 DB server support | Yes (AFS3 protocol only) |
| OpenAFS 1.x server support | Yes (AFS3 protocol only) |
| DB Servers support AFS file servers | Yes |
| Thread safe libraries | Yes |
| File Lock State Callback Notification | Yes |
| Atomic Create File in Locked State | Yes |
| Valid AFS3 Volume Status Info Replies | Yes |
| Server Thread Limits | Up to OS capability |
| Dynamic Thread Pools | Yes |
| Linux reflink aware | Yes |
| File Server Meltdown Protection | Yes |
| IPv6 enabled | Yes |
| Microsoft Direct Access compatibility | Yes |
| Kerberos Profile-based Configuration | Yes |
*A Security Level is defined as a Rx Security class (rxkad or rxgk) combined with cryptographic requirements for data privacy and integrity protection. Security Levels are enforced at the File Server.