ZFS v0.7.0

Customized zpool iostat|status columns - Additional columns can be added to the zpool iostat and zpool status output to show more information. Several useful scripts are provided which can report drive temperature, SMART data, enclosure LED status, and more. Administrators and users can add additional scripts to meet their needs.

Latency and request size histograms - Use the zpool iostat -l option to show on-the-fly latency stats and zpool iostat -w to generate a histogram showing the total latency of each IO. The zpool iostat -r option can be used to show the size of each IO. These statistics are available per-disk to aid in finding misbehaving devices.

Scrub Pause - The zpool scrub -p option can be used to pause/resume an active scrub without having to cancel it.

Delegations - The zfs allow and zfs unallow subcommands can be used to delegate ZFS administrative permissions for the file systems to non-privileged users.

Large dnodes - This feature improves metadata performance allowing extended attributes, ACLs, and symbolic links with long target names to be stored in the dnode. This benefits workloads such as SELinux, distributed filesystems like Lustre and Ceph, and any application which makes use of extended attributes.

User/group object accounting and quota - This feature adds per-object user/group accounting and quota limits to the existing space accounting and quota functionality. The zfs userspace and zfs groupspace subcommands have been extended to set quota limits and report on object usage.

Cryptographic checksums - Stronger SHA-512, Skein, or Edon-R checksums are available.

JBOD Management
Automatic drive online - Newly detected devices which are determined to be part of an imported pool are automatically brought online.
Automatic drive replacement - When the autoreplace pool property is on, any new device found in the same physical location as a device that previously belonged to the pool, is automatically formatted and replaced.
Automatic hot spares - When a device is faulted start a rebuild to a hot-spare device if available.
Fault LEDs - Set the fault LED for a device when it's faulted, clear it when it has been replaced.
Drive health monitoring - Automatically fault a device when an excessive number of read, write, or checksum errors are detected.
Force fault - Use zpool offline -f to proactively fault a problematic device.
Multipath aware - Can be used with advanced multipath configurations.

Performance

ARC Buffer Data (ABD) - Allocates ARC data buffers using scatter lists of pages instead of virtual memory. This approach minimizes fragmentation on the system allowing for a more efficient use of memory. The reduced demand for virtual memory also improves stability and performance on 32-bit architectures.
Compressed ARC - Cached file data is compressed by default in memory and uncompressed on demand. This allows for an larger effective cache which improves overall performance.
Vectorized RAIDZ - Hardware optimized RAIDZ which reduces CPU usage.
Supported SIMD instructions: sse2, ssse3, avx2, avx512f, and avx512bw, neon, neonx2
Vectorized checksums - Hardware optimized Fletcher-4 checksums which reduce CPU usage.
Supported SIMD instructions: sse2, ssse3, avx2, avx512f, neon
GZIP compression offloading - Hardware optimized GZIP compression offloading with QAT accelerator.
Metadata performance - Overall improved metadata performance. Optimizations include a multi-threaded allocator, batched quota updates, improved prefetching, and streamlined call paths.
Faster RAIDZ resilver - When resilvering RAIDZ intelligently skips sections of the device which don't need to be rebuilt.

Changes in Behavior

Non-privileged users are allowed to run zpool list, zpool iostat, zpool status, zpool get, zfs list, and zfs get. These commands no longer need to be added to the /etc/sudoers file.
By default task queues are now dynamic and worker threads will be created and destroyed as needed. This allows the system to automatically tune itself to ensure the optimal number of threads are used for the active workload which can result in a performance improvement.

Supported Kernels

Compatible with 2.6.32 - 4.12 Linux kernels.

Module Options

The default values for the module options were selected to yield good performance for the majority of workloads and configurations. They should not need to be tuned for most systems but are available for performance analysis and tuning. See the zfs-module-parameters(5) man page for a more complete description of the options and what they control.
Added:
dbuf_cache_hiwater_pct - Percent over dbuf_cache_max_bytes when dbufs must be evicted
dbuf_cache_lowater_pct - Percent below dbuf_cache_max_bytes when dbufs stop being evicted
dbuf_cache_max_bytes - Maximum size in bytes of the dbuf cache
dbuf_cache_max_shift - Cap the size of the dbuf cache to a log2 fraction of arc size
dmu_object_alloc_chunk_shift - CPU-specific allocator grabs 2^N objects at once
send_holes_without_birth_time - Ignore hole_birth txg for zfs send
zfetch_max_distance - Max bytes to prefetch per stream
zfs_abd_scatter_enabled - Toggle whether ABD allocations must be linear
zfs_abd_scatter_max_order - Maximum order allocation used for a scatter ABD
zfs_arc_dnode_limit - Minimum bytes of dnodes in ARC
zfs_arc_dnode_limit_percent - Percent of ARC meta buffers for dnodes
zfs_arc_dnode_reduce_percent - Percentage of excess dnodes to try to unpin
zfs_arc_meta_limit_percent - Percent of arc size for arc meta limit
zfs_arc_pc_percent - Percent of pagecache to reclaim ARC to
zfs_compressed_arc_enabled - Disable compressed arc buffers
zfs_deadman_checktime_ms - Dead I/O check interval in milliseconds
zfs_delete_blocks - Delete files larger than N blocks asynchronously
zfs_dmu_offset_next_sync - Enable forcing txg sync to find holes
zfs_free_bpobj_enabled - Enable processing of the free_bpobj
zfs_metaslab_segment_weight_enabled - Enable segment-based metaslab selection
zfs_metaslab_switch_threshold - Metaslab selection max buckets before switching
zfs_multihost_fail_intervals - Max allowed period without a successful mmp write
zfs_multihost_history - Historical statistics for last N multihost writes
zfs_multihost_import_intervals - Number of zfs_multihost_interval periods to wait for activity
zfs_multihost_interval - Milliseconds between mmp writes to each leaf
zfs_multilist_num_sublists - Number of sublists used in each multilist
zfs_per_txg_dirty_frees_percent - Percentage of dirtied blocks from frees in one TXG
zfs_sync_taskq_batch_pct - Percentage of CPUs to run an IO worker thread
zfs_vdev_mirror_non_rotating_inc - Non-rotating media load increment for non-seeking I/O's
zfs_vdev_mirror_non_rotating_seek_inc - Non-rotating media load increment for seeking I/O's
zfs_vdev_mirror_rotating_inc - Rotating media load increment for non-seeking I/O's
zfs_vdev_mirror_rotating_seek_inc - Rotating media load increment for seeking I/O's
zfs_vdev_mirror_rotating_seek_offset - Offset in bytes from the last I/O to trigger seek increment
zfs_vdev_queue_depth_pct - Queue depth percentage for each top-level vdev
zfs_vdev_raidz_impl - Select RAIDZ implementation.
zil_slog_bulk - Limit in bytes slog sync writes per commit
zio_dva_throttle_enabled - Throttle block allocations in the ZIO pipeline
zvol_request_sync - Synchronously handle bio requests
zvol_threads - Max number of threads to handle I/O requests
zvol_volmode - Default volmode property value
spl_max_show_tasks - Max number of tasks shown in taskq proc
spl_panic_halt - Cause kernel panic on assertion failures
Removed:
l2arc_nocompress - Skip compressing L2ARC buffers
zfetch_block_cap - Max number of blocks to fetch at a time
zfs_arc_num_sublists_per_state - Number of sublists used in each of the ARC state lists
zfs_disable_dup_eviction - Disable duplicate buffer eviction
zfs_vdev_mirror_switch_us - Switch mirrors every N microseconds
zil_slog_limit - Max commit bytes to separate log device
Changed:
zfs_admin_snapshot - Enable mkdir/rmdir/mv in .zfs/snapshot

Plusz ez azt hiszem, hozza jar. Nem ertem, miert nincs a fentiben:

* JBOD Management
* Automatic drive online - Newly detected devices which are determined
to be part of an imported pool are automatically brought online.
* Automatic drive replacement - When the autoreplace pool property is
on, any new device found in the same physical location as a device
that previously belonged to the pool, is automatically formatted and
replaced.
* Automatic hot spares - When a device is faulted start a rebuild to a
hot-spare device if available.
* Fault LEDs - Set the fault LED for a device when it's faulted, clear
it when it has been replaced.
* Drive health monitoring - Automatically fault a device when an
excessive number of read, write, or checksum errors are detected.
* Force fault - Use zpool offline -f to proactively fault a
problematic device.
* Multipath - Can be used with advanced multipath configurations.