I can't write to my Drobo

I have a new iMac (like this):
I am trying to connect the Drobo that I used to use with my Windows Computer.  It has 4 drives @ 3TB each, and the whole drive is over half full, so I am not terribly interested in the cost that it would take to "back up" that whole disk pack.  It took some shenanigans (reboots of both the drive and the computer; disconnections, and reconnections; fiddling around with MAC Disk Utility) to get it to show up in Finder at all.  I still have issues with it unmounting and needing to remount it, but that's not my main issue.
THE REAL PROBLEM:
Though I can get the Drobo to show up in finder, and I can read from it, I can't write to it.  Based on some earlier searching I tried this terminal command, which helped it to show up in finder, but didn't seem to affect it's being read-only:
new-host-3:~ davidholcomb$ getfileinfo /Volumes/Drobo
directory: "/Volumes/Drobo"
attributes: avbstclinmedz
created: 12/10/2012 19:06:46
modified: 09/11/2014 03:37:07
Looking at another thread (partition map check failed because no slices were found), which I wandered into because I was getting this error in Disk Utility upon running Verify Disk because I got a failure when I tried to "mount" the drive in Disk Utility:
This thread suggested I try a couple additional Terminal Commands, which I will post the results of here:
#1: diskutil list
new-host-3:~ davidholcomb$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         121.0 GB   disk0s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:          Apple_CoreStorage                         999.3 GB   disk1s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *1.1 TB     disk2
/dev/disk4
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *17.6 TB    disk4
   1:       Microsoft Basic Data Drobo                   17.6 TB    disk4s1
#2 diskutil cs list
new-host-3:~ davidholcomb$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 7DACBFD5-E22C-404B-98B1-99D97AD08B2F
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         1120333979648 B (1.1 TB)
    Free Space:   114688 B (114.7 KB)
    |
    +-< Physical Volume F26F7717-B081-4312-8252-65C9E3040AD4
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     120988852224 B (121.0 GB)
    |
    +-< Physical Volume 414053B5-EFD8-4FC0-87CE-F3913D6E876B
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk1s2
    |   Status:   Online
    |   Size:     999345127424 B (999.3 GB)
    |
    +-> Logical Volume Family BE5280EF-B093-4137-88A2-5AF3F1ACEFCC
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume D35043A0-F886-4223-81DD-4880F04ECEA3
            Disk:                  disk2
            Status:                Online
            Size (Total):          1114146996224 B (1.1 TB)
            Conversion Progress:   -none-
            Revertible:            No
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS
and #3: Mount:
new-host-3:~ davidholcomb$ mount
/dev/disk2 on / (hfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
/dev/disk4s1 on /Volumes/Drobo (ntfs, local, nodev, nosuid, read-only, noowners)
Another user who had run these commands and posted the results, seemed to have been missing an EFI partition on their external drive and was asked to run this command and post results.  But the thread with that user dies there.  Here are my results of this command:
new-host-3:~ davidholcomb$ diskutil info disk4
   Device Identifier:        disk4
   Device Node:              /dev/disk4
   Part of Whole:            disk4
   Device / Media Name:      TRUSTED Mass Storage Media
   Volume Name:              Not applicable (no file system)
   Mounted:                  Not applicable (no file system)
   File System:              None
   Content (IOContent):      GUID_partition_scheme
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported
   Total Size:               17.6 TB (17592186044416 Bytes) (exactly 34359738368 512-Byte-Units)
   Volume Free Space:        Not applicable (no file system)
   Device Block Size:        512 Bytes
   Read-Only Media:          No
   Read-Only Volume:         Not applicable (no file system)
   Ejectable:                Yes
   Whole:                    Yes
   Internal:                 No
   OS 9 Drivers:             No
   Low Level Format:         Not supported
Can anyone help me with a next step to make this drive read/writeable?

Turns out that the Drobo needs to be plugged straight into computer. I had it via hub. Though it has worked for the past couple weeks in this configuration, the new update pushed it over the edge, I guess. Plugged in directly and working fine.

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    agstrp awerks carbpl cwerks
    INTO TABLE t_caufv
    FROM caufv AS a
    INNER JOIN afih AS b
    ON aaufnr = baufnr
    INNER JOIN crhd AS c
    ON bgewrk = cobjid
    AND c~objty = 'D'
    WHERE ( a~pspel = space
    OR a~txjcd = space
    OR NOT a~objnr IN
    ( select OBJNR from COBRB AS e
    WHERE objnr = a~objnr ) )
    AND a~werks IN s_plant
    AND a~auart IN s_wtype
    AND NOT a~objnr IN
    ( select OBJNR from JEST AS d
    WHERE objnr = a~objnr
    AND ( dstat = 'A0081'OR dstat = 'A0018' )
    AND d~inact 'X' ).
    Reward points for all helpfull answers
    Thanks
    Ammi.

    Hi,
    SELECT objnr objid aufnr
            from afih
            into table t_afih.
    SELECT objnr
            from JEST
            into table t_JEST
            where stat = 'A0045'
               OR stat = 'A0046'
               AND inact 'X'.
    SELECT objnr
            from COBRB
            into table t_cobrb.
    SELECT arbpl werks objid objty
          from crhd
          INTO table it_crhd
          FOR ALL ENTRIES IN it_afih
          WHERE objty eq 'D'
          AND gewrk = it_afih-objid.
    SELECT aufnr objnr auart txjcd pspel gstrp werks aufnr
            FROM caufv
            INTO table t_caufv
            FOR ALL ENTRIES IN it_afih
            WHERE aufnr = it_afih-aufnr
              And pspel = ' '
              AND txjcd = ' '
             ANd objnr ne it_crhd-objnr
              AND auart in s_wtype
              AND werks in s_plant.
             AND objnr ne it_jest-objnr.
    dont use NE in the select statements, it may effect performance also. Instead use if statements inside
    loops.
    loop at t_caufv.
    read table it_chrd............
      if t_caufv-objnr ne it_chrd-objnr.
      read table it_jest..........
       if   if t_caufv-objnr ne it_jest-objnr.
        (proceed further).
       endif.
      endif.
    endloop.
    hope this helps.
    Reward if useful.
    Regards,
    Anu

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