You need to post the output of the following, like to did for the dmesg.
zfs list -r
zpool status -v
These should help people understand what is going on.
Also you should have a list of all the serial numbers / disk models and what the corresponding SATA ports they are plugged into.
Code:
[root@freenas] ~# zfs list -r NAME USED AVAIL REFER MOUNTPOINT dotsystem 1.68T 5.98T 326K /mnt/dotsystem dotsystem/.system 11.3G 5.98T 316M legacy dotsystem/.system/configs-5ece5c906a8f4df886779fae5cade8a5 209K 5.98T 209K legacy dotsystem/.system/configs-b69766f51e324c93b43fd37956f7ddc2 209K 5.98T 209K legacy dotsystem/.system/cores 1.24M 5.98T 1.24M legacy dotsystem/.system/rrd-5ece5c906a8f4df886779fae5cade8a5 209K 5.98T 209K legacy dotsystem/.system/rrd-b69766f51e324c93b43fd37956f7ddc2 209K 5.98T 209K legacy dotsystem/.system/samba4 698K 5.98T 698K legacy dotsystem/.system/syslog-5ece5c906a8f4df886779fae5cade8a5 761K 5.98T 761K legacy dotsystem/.system/syslog-b69766f51e324c93b43fd37956f7ddc2 11.0G 5.98T 11.0G legacy dotsystem/jails 1.35G 5.98T 500K /mnt/dotsystem/jails dotsystem/jails/.warden-template-pluginjail 512M 5.98T 512M /mnt/dotsystem/jails/.warden-template-pluginjail dotsystem/jails/plexmediaserver_1 723M 5.98T 1.20G /mnt/dotsystem/jails/plexmediaserver_1 dotsystem/jails/transmission_1 147M 5.98T 655M /mnt/dotsystem/jails/transmission_1 dotsystem/mymedia 1.66T 5.98T 1.43T /mnt/dotsystem/mymedia dotsystem/mymedia-mymedia-snapshots-clone 33.4M 5.98T 1.24T /mnt/dotsystem/mymedia-mymedia-snapshots-clone dotsystem/mymedia/.warden-template-pluginjail 512M 5.98T 512M /mnt/dotsystem/mymedia/.warden-template-pluginjail dotsystem/mymedia/.warden-template-pluginjail--x64 521M 5.98T 512M /mnt/dotsystem/mymedia/.warden-template-pluginjail--x64 dotsystem/mymedia/.warden-template-pluginjail--x64-20151007200436 512M 5.98T 512M /mnt/dotsystem/mymedia/.warden-template-pluginjail--x64-20151007200436 dotsystem/mymedia/.warden-template-standard--x64 2.47G 5.98T 2.38G /mnt/dotsystem/mymedia/.warden-template-standard--x64 dotsystem/mymedia/BTsync 203G 5.98T 197G /mnt/dotsystem/mymedia/BTsync dotsystem/mymedia/BTsync/.warden-template-pluginjail--x64 512M 5.98T 512M /mnt/dotsystem/mymedia/BTsync/.warden-template-pluginjail--x64 dotsystem/mymedia/BTsync/.warden-template-standard--x64 4.84G 5.98T 4.75G /mnt/dotsystem/mymedia/BTsync/.warden-template-standard--x64 dotsystem/mymedia/Cellphone_media_files 32.2G 5.98T 32.2G /mnt/dotsystem/mymedia/Cellphone_media_files dotsystem/mymedia/plexmediaserver_2 402M 5.98T 910M /mnt/dotsystem/mymedia/plexmediaserver_2 dotsystem/nfs_share1 209K 5.98T 209K /mnt/dotsystem/nfs_share1 dotsystem/webdavset 192M 5.98T 192M /mnt/dotsystem/webdavset freenas-boot 526M 344G 31K none freenas-boot/ROOT 519M 344G 25K none freenas-boot/ROOT/Initial-Install 2.91M 344G 511M legacy freenas-boot/ROOT/default 516M 344G 513M legacy freenas-boot/grub 6.78M 344G 6.78M legacy [root@freenas] ~#
[root@freenas] ~# zpool status -v
pool: dotsystem
state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
the pool may no longer be accessible by software that does not support
the features. See zpool-features(7) for details.
scan: scrub repaired 0 in 6h44m with 0 errors on Sun Nov 8 06:44:25 2015
config:
NAME STATE READ WRITE CKSUM
dotsystem ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
gptid/1fd3b852-fa43-11e3-b1ee-0cc47a00c536 ONLINE 0 0 0
gptid/202ba896-fa43-11e3-b1ee-0cc47a00c536 ONLINE 0 0 0
gptid/20e1bd60-fa43-11e3-b1ee-0cc47a00c536 ONLINE 0 0 0
gptid/2136c99a-fa43-11e3-b1ee-0cc47a00c536 ONLINE 0 0 0
errors: No known data errors
pool: freenas-boot
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
freenas-boot ONLINE 0 0 0
gptid/d88181fb-88e8-11e5-8281-0cc47a00c536 ONLINE 0 0 0
errors: No known data errors
[root@freenas] ~#