我正在运行基于FreeBSD 10.2-RELEASE-p2＃0 r287260M：2015年8月28日星期五18:38:18的Nas4Free 10.2.0.2 – Prester（修订版1814）。系统具有24 GB的内存。 我已经尝试了ashift=9和12没有区别。
我只得到14.7T的自由空间。 这是为什么？
编辑 ：我现在尝试OpenIndiana的ZFS实施与同一台机器，它提供28.5T免费和列表驱动器为8001.49GB。 所以这可能是FreeBSD的ZFS实现或FreeBSD HDD驱动程序错误的一个错误？
编辑 ：我现在已经尝试使用FreeBSD-10.2-STABLE-amd64-20150917-r287929-memstick.img，并提供28.1T的可用空间，所以这是一个错误。
磁盘：
ada0 at ata2 bus 0 scbus2 target 0 lun 0 ada0: <ST8000AS0002-1NA17Z AR13> ACS-2 ATA SATA 3.x device ada0: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes) ada0: 7630885MB (15628053168 512 byte sectors: 16H 63S/T 16383C) ada1 at ata2 bus 0 scbus2 target 1 lun 0 ada1: <ST8000AS0002-1NA17Z AR13> ACS-2 ATA SATA 3.x device ada1: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes) ada1: 7630885MB (15628053168 512 byte sectors: 16H 63S/T 16383C) ada2 at ata3 bus 0 scbus3 target 0 lun 0 ada2: <ST8000AS0002-1NA17Z AR13> ACS-2 ATA SATA 3.x device ada2: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes) ada2: 7630885MB (15628053168 512 byte sectors: 16H 63S/T 16383C) ada3 at ata3 bus 0 scbus3 target 1 lun 0 ada3: <ST8000AS0002-1NA17Z AR13> ACS-2 ATA SATA 3.x device ada3: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes) ada3: 7630885MB (15628053168 512 byte sectors: 16H 63S/T 16383C) ada4 at ata4 bus 0 scbus4 target 0 lun 0 ada4: <ST8000AS0002-1NA17Z AR13> ACS-2 ATA SATA 3.x device ada4: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes) ada4: 7630885MB (15628053168 512 byte sectors: 16H 63S/T 16383C) ada5 at ata5 bus 0 scbus5 target 0 lun 0 ada5: <ST8000AS0002-1NA17Z AR13> ACS-2 ATA SATA 3.x device ada5: 300.000MB/s transfers (SATA 2.x, UDMA5, PIO 8192bytes) ada5: 7630885MB (15628053168 512 byte sectors: 16H 63S/T 16383C)
删除旧的尝试和ZFS元数据：
storage: /# zpool destroy storage2 storage: /# dd if=/dev/zero of=/dev/ada0 bs=1m count=128 storage: /# dd if=/dev/zero of=/dev/ada1 bs=1m count=128 storage: /# dd if=/dev/zero of=/dev/ada2 bs=1m count=128 storage: /# dd if=/dev/zero of=/dev/ada3 bs=1m count=128 storage: /# dd if=/dev/zero of=/dev/ada4 bs=1m count=128 storage: /# dd if=/dev/zero of=/dev/ada5 bs=1m count=128 storage: /# dd if=/dev/zero of=/dev/ada0 oseek=15628000000 storage: /# dd if=/dev/zero of=/dev/ada1 oseek=15628000000 storage: /# dd if=/dev/zero of=/dev/ada2 oseek=15628000000 storage: /# dd if=/dev/zero of=/dev/ada3 oseek=15628000000 storage: /# dd if=/dev/zero of=/dev/ada4 oseek=15628000000 storage: /# dd if=/dev/zero of=/dev/ada5 oseek=15628000000
创build新的池：
storage: /# zpool create storage2 raidz2 ada0 ada1 ada2 ada3 ada4 ada5
zfs列表：
storage: /# zfs list NAME USED AVAIL REFER MOUNTPOINT storage2 432K 14.5T 192K /storage2
iostat的：
storage: /# zpool iostat storage2 capacity operations bandwidth pool alloc free read write read write ---------- ----- ----- ----- ----- ----- ----- storage2 900K 43.5T 0 1 0 7.84K
zpool列表：
storage: /# zpool list NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT storage2 43.5T 900K 43.5T - 0% 0% 1.00x ONLINE -
zpool状态：
storage: /# zpool status pool: storage2 state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM storage2 ONLINE 0 0 0 raidz2-0 ONLINE 0 0 0 ada0 ONLINE 0 0 0 ada1 ONLINE 0 0 0 ada2 ONLINE 0 0 0 ada3 ONLINE 0 0 0 ada4 ONLINE 0 0 0 ada5 ONLINE 0 0 0 errors: No known data errors
zfs列表：
storage: /# zfs list -t all NAME USED AVAIL REFER MOUNTPOINT storage2 480K 14.5T 192K /storage2
属性：
# zfs get all storage2 NAME PROPERTY VALUE SOURCE storage2 type filesystem - storage2 creation Thu Sep 24 18:48 2015 - storage2 used 623K - storage2 available 14.5T - storage2 referenced 192K - storage2 compressratio 1.00x - storage2 mounted yes - storage2 quota none default storage2 reservation none default storage2 recordsize 128K default storage2 mountpoint /storage2 default storage2 sharenfs off default storage2 checksum on default storage2 compression off default storage2 atime on default storage2 devices on default storage2 exec on default storage2 setuid on default storage2 readonly off default storage2 jailed off default storage2 snapdir hidden default storage2 aclmode discard default storage2 aclinherit restricted default storage2 canmount on default storage2 xattr off temporary storage2 copies 1 default storage2 version 5 - storage2 utf8only off - storage2 normalization none - storage2 casesensitivity sensitive - storage2 vscan off default storage2 nbmand off default storage2 sharesmb off default storage2 refquota none default storage2 refreservation none default storage2 primarycache all default storage2 secondarycache all default storage2 usedbysnapshots 0 - storage2 usedbydataset 192K - storage2 usedbychildren 432K - storage2 usedbyrefreservation 0 - storage2 logbias latency default storage2 dedup off default storage2 mlslabel - storage2 sync standard default storage2 refcompressratio 1.00x - storage2 written 192K - storage2 logicalused 80K - storage2 logicalreferenced 9.50K - storage2 volmode default default storage2 filesystem_limit none default storage2 snapshot_limit none default storage2 filesystem_count none default storage2 snapshot_count none default storage2 redundant_metadata all default
zdb -C
# zdb -C storage2 MOS Configuration: version: 5000 name: 'storage2' state: 0 txg: 4 pool_guid: 9410028398282520009 hostid: 1452759488 hostname: 'storage.home' vdev_children: 1 vdev_tree: type: 'root' id: 0 guid: 9410028398282520009 create_txg: 4 children[0]: type: 'raidz' id: 0 guid: 16070893740466238556 nparity: 2 metaslab_array: 34 metaslab_shift: 38 ashift: 12 asize: 48009350479872 is_log: 0 create_txg: 4 children[0]: type: 'disk' id: 0 guid: 17748612860167792044 path: '/dev/ada0' phys_path: '/dev/ada0' whole_disk: 1 create_txg: 4 children[1]: type: 'disk' id: 1 guid: 13659584123500602452 path: '/dev/ada1' phys_path: '/dev/ada1' whole_disk: 1 create_txg: 4 children[2]: type: 'disk' id: 2 guid: 16565608857540887077 path: '/dev/ada2' phys_path: '/dev/ada2' whole_disk: 1 create_txg: 4 children[3]: type: 'disk' id: 3 guid: 400417648284480610 path: '/dev/ada3' phys_path: '/dev/ada3' whole_disk: 1 create_txg: 4 children[4]: type: 'disk' id: 4 guid: 15293896650775132923 path: '/dev/ada4' phys_path: '/dev/ada4' whole_disk: 1 create_txg: 4 children[5]: type: 'disk' id: 5 guid: 14105808749251955600 path: '/dev/ada5' phys_path: '/dev/ada5' whole_disk: 1 create_txg: 4 features_for_read: com.delphix:hole_birth com.delphix:embedded_data