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h a single mirror the most critical metadata will appear three times on each side of the mirror for a total of six copies this ensures that while user data may be lost due to corruption all data in the pool will be discoverable and the pool will still be usable this will be expanded in the future to allow user data replication on a per dataset basis this feature integrated on 4 10 06 with the following bug fix 6410698 zfs metadata needs to be more highly replicated ditto blocks this feature is available in nevada build 38 solaris 10 10 06 release build 09 zfs pool version 1 this is the initial zfs on disk format as integrated on 10 31 05 during the next six months of internal use there were a few on disk format changes that did not result in a version number change but resulted in a flag day since earlier versions could not read the newer changes the first official releases supporting this version are nevada build 36 solaris 10 6 06 release earlier releases may not support this version despite being formatted with the same on disk number this is due to 6389368 fat zap should use 16k blocks with backwards compatibility 6390677 version number checking makes upgrades challenging zfs pool versions zfs pool versions i was looking for an overview of the available zfs pool versions the opensolaris xwiki page of the zfs group show on page for every page but not an complete overview history of freebsd releases with zfs is as follows 7 0 original zfs import zfs v6 requires significant tuning for stable operation no longer supported 7 2 still zfs v6 improved memory handling amd64 may need no memory tuning no longer supported 7 3 backport of new zfs v13 code similar to the 8 0 code 8 0 new zfs v13 code lots of bug fixes recommended over all past versions no longer supported 8 1 zfs v14 8 2 zfs v15 9 0 zfs v28 here i list of all current versions until today 9 may 2011 zfs pool version 31 this version includes support for improved zfs list performance pool version 31 is available in this release nevada build 150 the change record for the version 31 change is 6980669 zfs rename r is slow causes appliance ui to hang zfs pool version 30 this version includes support for zfs encryption pool version 30 is available in this release nevada build 149 the change record for the version 30 change is 4854202 zfs data set encryption zfs pool version 29 this version includes support for the raid z mirror hybrid allocator pool version 29 is available in this release nevada build 148 the change record for the version 29 change is 6977913 raid z mirror hybrid allocator zfs pool version 28 this version includes support for multiple virtual device replacements pool version 28 is available in this release nevada build 147 the change record for the version 28 change is 6782540 zpool cannot replace a replacing device zfs pool version 27 this version includes support for improved snapshot creation performance pool version 27 is available in this release nevada build 145 the change record for the version 27 change is 6844896 recursive snapshots take a long time zfs pool version 26 this version includes support for improved snapshot deletion performance pool version 26 is available in this release nevada build 141 the change record for the version 26 change is 6948890 snapshot deletion can induce pathologically long spa_sync times zfs pool version 25 this version includes support for improved pool scrubbing and resilvering statistics pool version 25 is available in this release nevada build 140 the change record for the version 25 change is 6391915 provide interval arg to zpool status to monitor resilvering zfs pool version 24 this version includes support for system attributes pool version 24 is available in this release nevada build 137 the change records for the version 24 change are 6716117 zfs needs native system attribute infrastructure 6516171 zpl symlinks should have their own object type zfs pool version 23 this version includes support for the slim zil pool version 23 is available in this release nevada build 135 the change record for the version 23 change is 6595532 zil is too talkative zfs pool version 22 this version includes support for zfs receive properties pool version 22 is available in this release nevada build 128 the psarc case for the version 22 change is psarc 2009 510 zfs received properties zfs pool version 21 this version includes support for zfs deduplication properties pool version 21 is available in this release nevada build 128 the psarc case for the version 21 change is psarc 2009 571 zfs deduplication properties zfs pool version 20 this version includes the zle compression algorithm that is needed to support the zfs deduplication properties in zfs pool version 21 both pool versions are available in this release nevada build 128 the psarc case for the version 20 change is psarc 2009 571 zfs deduplication properties zfs pool version 19 this version includes support for the following feature zfs log device removal this feature is available in nevada build 125 the related change record for the version 19 change is 6574286 removing a slog doesn t work zfs pool version 18 this version includes support for the following feature zfs snapshot holds this feature is available in nevada build 121 the related change record for the version 18 change is 6803121 want user settable refcounts on snapshots zfs pool version 17 this version includes support for the following feature triple parity raid z this feature is available in nevada build 120 the related change record for the version 17 change is 6854612 triple parity raid z zfs pool version 16 this version includes support for the following feature stmf property support this feature is available in nevada build 116 the related bug for the version 16 change is 6736004 zfs volumes need an additional property for comstar support zfs pool version 15 this version includes support for the following features userused and groupused properties userquota and groupquota properties these features are available in nevada build 114 the related bug and psarc case for version 15 changes are 6501037 want user group quotas on zfs psarc 2009 204 zfs user group quotas and space accounting zfs pool version 14 this version includes support for the following feature passthrough x aclinherit property support this feature is available in opensolaris 2009 06 nevada build 103 the related bug and psarc case for the version 14 change are 6765166 need to provide mechanism to optionally inherit ace_execute psarc 2008 659 new zfs passthrough x acl inheritance rules zfs pool version 13 this version includes support for the following features usedbysnapshots property usedbychildren property usedbyrefreservation property usedbydataset property these features are available in opensolaris 2008 11 nevada build 98 the related bug and psarc case for version 13 change are 6730799 want user properties on snapshots psarc 2008 518 zfs space accounting enhancements zfs pool version 12 this version includes support for the following feature snapshot properties this feature is available in opensolaris 2008 11 nevada build 96 the related bug for the version 12 change is 6701797 want user properties on snapshot zfs pool version 11 this version includes support for the following feature improved zpool scrub resilver performance this feature is available in opensolaris 2008 11 nevada build 94 the related bug for the version 11 change is 6343667 scrub resilver has to start over when a snapshot is taken note this bug is fixed when using build 94 even with older pool versions however upgrading the pool can improve scrub performance when there are many file systems snapshots and clones zfs pool version 10 this version includes support for the following feature devices can be added to a storage pool as cache devices these devices provide an additional layer of caching between main memory and disk using cache devices provides the greatest performance improvement for random read workloads of mostly static content this feature is available in nevada build 78 the solaris 10 10 08 release includes zfs pool version 10 but support for cache devices is not included in this solaris release the related bug for the version 10 change is 6536054 second tier external arc zfs pool version 9 this version includes support for the following features in addition to the existing zfs quota and reservation features this release includes dataset quotas and reservations that do not include descendent datasets such as snapshots and clones in the space consumption zfs set refquota and zfs set refreservation a reservation is automatically set when a non sparse zfs volume is created that matches the size of the volume this release provides an immediate reservation feature so that you set a reservation on a non sparse volume with enough space to take snapshots and modify the contents of the volume cifs server support these features are available in nevada build 77 the related bugs for version 9 changes are 6431277 want filesystem only quotas 6483677 need immediate reservation 6617183 cifs service psarc 2006 715 zfs pool version 8 this version now supports the ability to delegate zfs 1m administrative tasks to ordinary users this feature is available in nevada build 69 solaris 10 10 08 release the related bug for the version 8 change is 6349470 investigate non root restore backup zfs pool version 7 this version includes support for the following feature the zfs intent log zil satisfies the need of some applications to know the data they changed is on stable storage on return from a system call the intent log holds records of those system calls and they are replayed if the system power fails or panics if they have not been committed to the main pool when the intent log is allocated from the main pool it allocates blocks that chain through the pool this version adds the capability to specify a separate intent log device or devices this feature is available in nevada build 68 solaris 10 10 08 release the related bug for the version 7 change is 6339640 make zil use nvram when available zfs pool version 6 this version includes support for the following feature bootfs pool property this feature is available in nevada build 62 solaris 10 10 08 release the related bugs for version 6 changes are as follows 4929890 zfs boot support for the x86 platform 6479807 pools need properties zfs pool version 5 this version includes support for the following feature gzip compression for zfs datasets this feature is available in nevada build 62 solaris 10 10 08 release the related bug for the version 5 changes is 6536606 gzip compression for zfs zfs pool version 4 this version includes support for the following feature zpool history this feature is available in nevada build 62 solaris 10 8 07 release the related bugs for version 4 changes are as follows 6529406 zpool history needs to bump the on disk version 6343741 want to store a command history on disk zfs pool version 3 this version includes support for the following features hot spares double parity raid z raidz2 improved raid z accounting these features are available in nevada build 42 solaris 10 11 06 release build 3 the related bugs for version 3 changes are as follows 6405966 hot spare support in zfs 6417978 double parity raid z a k a raid6 6288488 du reports misleading size on raid z zfs pool version 2 this version includes support for ditto blocks or replicated metadata due to the tree like structure of the zfs on disk format an uncorrectable error in a leaf block may be relatively benign while an uncorrectable error in pool metadata can result in an unopenable pool this feature introduces automatic replication of metadata up to 3 copies of each block independent of any underlying pool wide redundancy for example on a pool with a single mirror the most critical metadata will appear three times on each side of the mirror for a total of six copies this ensures that while user data may be lost due to corruption all data in the pool will be discoverable and the pool will still be usable this will be expanded in the future to allow user data replication on a per dataset basis this feature integrated on 4 10 06 with the following bug fix 6410698 zfs metadata needs to be more highly replicated ditto blocks this feature is available in nevada build 38 solaris 10 10 06 release build 09 zfs pool version 1 this is the initial zfs on disk format as integrated on 10 31 05 during the next six months of internal use there were a few on disk format changes that did not result in a version number change but resulted in a flag day since earlier versions could not read the newer changes the first official releases supporting this version are nevada build 36 solaris 10 6 06 release earlier releases may not support this version despite being formatted with the same on disk number this is due to 6389368 fat zap should use 16k blocks with backwards compatibility 6390677 version number checking makes upgrades challenging gepostet von harryd unter 8 56 pm 0 kommentare labels freebsd freenas nexenta opensolaris zfs saturday may 7 2011 nearly one year ago i ve written that we build our own house now after a lot work is behind us we are in and i have more time than i had in the past year currently i am preparing a blogpost if you think that might has something to do with freenas 8 and a benchmark than you might be right so stay tuned where is harryd follow up where is harryd follow up nearly one year ago i ve written that we build our own house now after a lot work is behind us we are in and i have more time than i had in the past year currently i am preparing a blogpost if you think that might has something to do with freenas 8 and a benchmark than you might be right so stay tuned gepostet von harryd unter 7 42 am 0 kommentare labels freenas general monday june 7 2010 constantin gives here an great introduction into zfs vdevs and performance a closer look at zfs vdevs and performance a closer look at zfs vdevs and performance constantin gives here an great introduction into zfs vdevs and performance gepostet von harryd unter 5 07 pm 0 kommentare labels freenas opensolaris zfs monday may 31 2010 i ve tested the performance of freenas 0 7 1 stable build 5127 and nexentastor community edition 3 0 2 i will not dig into the different features or the details of both webguis for the tests i ve used the following hardware server cpu intel core2duo e6300 1 8 ghz 2 mb cache ram 2 gbyte mainboard intel dg965wh harddisks 3x westerndigital wd3200 320 gbyte connected to the onboard sata2 client my good old macbook pro late 2008 4 gbyte ram mac os x 10 6 3 software iscsi initiator global san iscsi initiator 4 0 0 204 benchmark software xbench benchmark software helios lan test benchmark software iozone macports protocols cifs nfs afp currently only available for freenas iscsi benchmarks xbench the best out of 5 results helios lan test 10 tests two times best result io...