FreeNAS out of space error on only half full server

[dc2013]

Hello Experts!
I'm a newbie FreeNAS user (FreeNAS-8.3.1-RELEASE-p2-x64 (r12686+b770da6_dirty)). I have RAIDZ2 with 6x2TB drives and 16GB RAM. The problem is that I created a number of data sets and filled all of them partially but one (the problematic one) with data. Currently I see that I still have 5.3TB free space. All my datasets have the same permissions and settings, and I can put data to all of them but one. In windows using CIFS share, when I try to put any file to one of the datasets I get error that there is no available space. The data I am trying to put is only a small fraction of available space. If you need more info, please let me know the commands to run and I will post the output for you.


Any help will be superbly appreciated!!!!

Mem: 123M Active, 65M Inact, 3341M Wired, 2288K Cache, 179M Buf, 11G Free
ARC: 2921M Total, 11M MFU, 2825M MRU, 18K Anon, 65M Header, 20M Other
Swap: 12G Total, 12G Free

Build FreeNAS-8.3.1-RELEASE-p2-x64 (r12686+b770da6_dirty)
Platform AMD A4-5300 APU with Radeon(tm) HD Graphics
Memory 15809MB
System Time Mon Jun 24 13:13:13 EDT 2013
Uptime 1:13PM up 2:09, 0 users
Load Average 0.07, 0.05, 0.01

Code:

[root@moe ~]# zpool list                                                   
NAME        SIZE  ALLOC  FREE    CAP  DEDUP  HEALTH  ALTROOT             
MainRAIDZ2  10.9T  2.69T  8.19T    24%  1.00x  ONLINE  /mnt

Code:

[root@moe ~]# zpool status
 
  pool: MainRAIDZ2                                                         
state: ONLINE                                                             
  scan: scrub repaired 0 in 0h12m with 0 errors on Mon Jun 24 13:07:04 2013
config:                                                                   
                                                                           
        NAME                                            STATE    READ WRITE CKSUM                                                                         
        MainRAIDZ2                                      ONLINE      0    0    0                                                                         
          raidz2-0                                      ONLINE      0    0    0                                                                         
            gptid/a77125e2-dabe-11e2-9658-bc5ff4ac7b8a  ONLINE      0    0    0                                                                         
            gptid/a800d1aa-dabe-11e2-9658-bc5ff4ac7b8a  ONLINE      0    0    0                                                                         
            gptid/a89e3808-dabe-11e2-9658-bc5ff4ac7b8a  ONLINE      0    0    0                                                                         
            gptid/a92d3693-dabe-11e2-9658-bc5ff4ac7b8a  ONLINE      0    0    0                                                                         
            gptid/a9ab0d26-dabe-11e2-9658-bc5ff4ac7b8a  ONLINE      0    0    0                                                                         
            gptid/aa344d9e-dabe-11e2-9658-bc5ff4ac7b8a  ONLINE      0    0    0
                                                                           
errors: No known data errors 

 

[dc2013]

Update to my post above: I started copying smaller chunks at a time and it is so far going well. Just FYI...., these are archived files of 5-8GB each. So, why can't I copy more of such large files at the same time but gotta move like a few at once only? Any ideas?