I've started a srub but that too is starting off very slow

               capacity     operations    bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
sahara      1.13T   243G     66     32  7.50M   180K
  mirror    1.13T   243G     66     32  7.50M   180K
    c0t0d0      -      -      1     77  12.2K  7.66M
    c1t0d0      -      -     64      7  7.53M   160K
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
sahara      1.13T   243G     66    464   171K  2.53M
  mirror    1.13T   243G     66    464   171K  2.53M
    c0t0d0      -      -     61     29   163K  2.53M
    c1t0d0      -      -     57     33   154K  2.90M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
sahara      1.13T   243G     28    501  70.8K  5.62M
  mirror    1.13T   243G     28    501  70.8K  5.62M
    c0t0d0      -      -     12     60  30.8K  5.77M
    c1t0d0      -      -     15     55  40.0K  5.27M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
sahara      1.13T   243G     39     51  99.3K  6.40M
  mirror    1.13T   243G     39     51  99.3K  6.40M
    c0t0d0      -      -     18     51  47.5K  6.30M
    c1t0d0      -      -     20     51  51.7K  6.40M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
sahara      1.13T   243G     82      7   215K   268K
  mirror    1.13T   243G     82      7   215K   268K
    c0t0d0      -      -     80      4   215K   210K
    c1t0d0      -      -     88      4   231K   268K
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
sahara      1.13T   243G     49    544   128K  2.29M
  mirror    1.13T   243G     49    544   128K  2.29M
    c0t0d0      -      -     44     31   117K  2.29M
    c1t0d0      -      -     39     30   104K  2.29M
----------  -----  -----  -----  -----  -----  -----

               capacity     operations    bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
sahara      1.13T   243G     74     24   245K  1.52M
  mirror    1.13T   243G     74     24   245K  1.52M
    c0t0d0      -      -     68     16   186K  1.52M
    c1t0d0      -      -     74     19   248K  1.52M
----------  -----  -----  -----  -----  -----  -----

sahara:
    version: 22
    name: 'sahara'
    state: 0
    txg: 436691
    pool_guid: 1647524158157444734
    hostid: 8832737
    hostname: 'getafix'
    vdev_children: 1
    vdev_tree:
        type: 'root'
        id: 0
        guid: 1647524158157444734
        children[0]:
            type: 'mirror'
            id: 0
            guid: 15124998041910158027
            metaslab_array: 14
            metaslab_shift: 32
            ashift: 9
            asize: 1500294676480
            is_log: 0
            children[0]:
                type: 'disk'
                id: 0
                guid: 5405856878232070164
                path: '/dev/dsk/c0t0d0s0'
                devid: 'id1,s...@twd______ext_hdd_1021____wmavu3096894____/a'
                phys_path: '/p...@0,0/pci15d9,d...@1a,7/stor...@1/d...@0,0:a'
                whole_disk: 1
                DTL: 77
                offline: 1
            children[1]:
                type: 'disk'
                id: 1
                guid: 5096009099665214152
                path: '/dev/dsk/c1t0d0s0'
                devid: 
'id1,s...@tst31500341as____________________________2gevywe5/a'
                phys_path: '/p...@0,0/pci15d9,d...@1a,7/stor...@2/d...@0,0:a'
                whole_disk: 1
                DTL: 85
    rewind_txg_ts: 1276641613
    seconds_of_rewind: 0
    verify_data_errors: 0



> - dedup tables too big to fit in RAM, forced to swap

dedup is 1.00 not many duplicates of data. 


> - lotsa lotsa small highly fragmented files and zpool
> almost (> 80+ %) full

This is true  

sahara   1.36T  1.13T   243G    82%  1.00x  ONLINE  -

1 have 4G, should be using more? 

last pid:  2195;  load avg:  0.01,  0.01,  0.01;  up 1+07:47:54        07:39:52
36 processes: 35 sleeping, 1 on cpu
CPU states: 98.8% idle,  0.0% user,  1.2% kernel,  0.0% iowait,  0.0% swap
Kernel: 3067 ctxsw, 3 trap, 3915 intr, 307 syscall, 2 flt
Memory: 4094M phys mem, 237M free mem

   PID USERNAME NLWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
  2194 root        1  50    0 3672K 1768K cpu/0    0:00  0.04% top
   713 root       18  59    0   16M 7648K sleep    0:14  0.00% smbd
  1016 root        1  59    0 5472K 2644K sleep    0:03  0.00% ntpd
   212 root        6  59    0   11M 4124K sleep    0:01  0.00% devfsadm
   669 root        1  59    0 4112K  828K sleep    0:01  0.00% ipmon
  1215 root        1  59    0   23M 8560K sleep    0:02  0.00% httpd
     9 root       13  59    0 8668K 5960K sleep    0:02  0.00% svc.configd
  1232 daemon      2  60  -20 2800K 1884K sleep    0:01  0.00% nfsd
  1043 daemon      2  60  -20 2756K 1892K sleep    0:00  0.00% lockd
  2104 root        1  59    0   11M 5132K sleep    0:00  0.00% sshd
  1894 root        1  59    0   11M 5116K sleep    0:00  0.00% sshd
   210 daemon      3  59    0 7836K 4420K sleep    0:00  0.00% kcfd
     7 root       10  59    0 7756K 4396K sleep    0:00  0.00% svc.startd
  2103 root        1  59    0 9652K 4092K sleep    0:00  0.00% sshd
  1893 root        1  59    0 9652K 4028K sleep    0:00  0.00% sshd
  1624 root       18  59    0 5448K 3532K sleep    0:00  0.00% nscd
   203 daemon      5  59    0 5576K 2964K sleep    0:00  0.00% idmapd
   209 root       17  59    0 5676K 2476K sleep    0:00  0.00% syseventd
  1216 webservd    1  59    0   21M 2464K sleep    0:00  0.00% httpd
  1230 root        7  59    0 3532K 2368K sleep    0:00  0.00% mountd
  1897 root        1  59    0 3680K 2352K sleep    0:00  0.00% bash
  2107 root        1  59    0 3680K 2340K sleep    0:00  0.00% bash
  1217 webservd    1  59    0   23M 2292K sleep    0:00  0.00% httpd
  1218 webservd    1  59    0   23M 2292K sleep    0:00  0.00% httpd
   881 root       11  59    0 4436K 2276K sleep    0:00  0.00% syslogd
  1029 daemon      1  59    0 3116K 2148K sleep    0:00  0.00% statd
   892 root        1  59    0 4200K 1512K sleep    0:00  0.00% sshd
  1262 root        1  59    0 2860K 1472K sleep    0:00  0.00% rsync
   847 daemon      1  59    0 3248K 1424K sleep    0:00  0.00% rpcbind
  1294 root        1  59    0 2032K 1416K sleep    0:00  0.00% ttymon
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