= FhGFS Changelog =

== Changes in 2009.08-r9 ==

This is a maintenance release, including updates for all FhGFS services.
Upgrading to r9 is highly recommended for all users with medium and large
installations (>1M files, >50 Clients) due to significant latency reduction
and improvements in metadata server memory management.


=== General ===
* improved: various minor improvements (mem access on NUMA systems, IO request
     tuning, ...) [r6]
* improved: Infiniband connection tear down and event handling [r6, r7]
* improved: network request latency reduced (especially for high number of
    concurrent connections) [r8]
* improved: Infiniband server connection limit increased (from hundreds to
    thousands) [r8]
* improved: TCP messaging latency reduced in some situations [r9]
* fixed: some rpm and deb package issues (e.g. uninstall cleanup) [r9]

=== Client ===
* fixed: file creation atomicity [r2]
* fixed: file size update under certain conditions in append mode [r3]
* new: auto-rebuild modules on kernel version change (optional; pre-release)
     [r4]
* new: static 32bit inode numbers (identical for all mounts; optional;
     pre-release) [r4]
* fixed: file handle cleanup for interrupted processes [r4]
* fixed: fsync operation with tuneRemoteFSync enabled [r5]
* fixed: problem of depleted message buffers [r6]
* improved: sparse file reading [r7]
* fixed: problem of depleted conns [r7]
* fixed: potential mount problem [r8c]
* fixed: init script start problem [r8d]
* new: option to create hardlinks as symlinks [r9]
* fixed: cleanup of half-open ib connections [r9b]
* fixed: mtime/atime update under certain conditions [r9c]
* fixed: getdents() d_ino on 32bit clients [r9d]
* new: support for vanilla kernels up to version 2.6.36 (min version: 2.6.16)
     [r9e]
* fixed: problem with connection retries during read/write [r9f]
* improved: procfs nodes connection info (added IP address) [r9g]

=== Metadata Server ===
* fixed: setting mtime/atime to lower value [r6]
* improved: memory management [r8]
* fixed: potential problem if connection fails during initial hand-shake [r9b]
* improved: increase open files limit on startup [r9c]

=== Storage Server ===
* fixed: potential file handle leak [r8b]
* fixed: potential problem if connection fails during initial hand-shake [r9b]
* fixed: potential problem during very first IO operation after startup [r9c]

=== Management Server ===
* improved: RDMA connectivity [r9b]
* fixed: potential problem during very first IO operation after startup [r9c]

=== Admon (Installation & Monitoring) ===
* impoved: various minor changes and improvements [r7]
* fixed: Windows GUI right-click problem [r9]

=== Online Configuration Tool ===
* fixed: client config parse problem with new hardlinks-as-symlinks option
     [r9b]
* fixed: arguments parse problem with modes createdir and createfile [r9c]
* improved: automatic mount path detection [r9d]

=== OpenTk Lib (Server IB Communication Library) ===
* improved: disconnect detection [r9b]
* fixed: potential IB disconnect cleanup problem [r9c]


== Changes in 2009.08-r1 ==

This release contains various metadata performance improvements, introduces
pagecache support for clients and contains the new Admon Java frontend.

=== General ===
* improved: metadata access performance (lookup, file creation etc.)
* improved: storage directory locking mechanism (for management, metadata,
     storage servers)

=== Client ===
* new: optional use of kernel pagecache (initial implementation, will receive
     various performance improvements during the next releases)
* new: support for vanilla kernels up to version 2.6.31
* improved: handling of communication retries
* improved: communication retry configuration
* improved: concurrent file system access from multiple processes on the same
     machine (internal locking optimizations)

=== Admon (Installation & Monitoring) ===
* new: Java-based GUI front-end (designed as a full replacement for the former
     browser-based GUI)

=== Online Configuration Tool ===
* new: shows live throughput stats from servers

=== Compatibility ===
* note: storage format is compatible with 2009.03-r1 release