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 We have The NexentaStor 3.13 as NAS system and Dell compellent as the SAN system.
The topology is shown as bellow:
san

 

Step 1. Connect the Volume on the SAN to the NAS system.

1. Before the installaion:on NexentaStor: show lun

existing-lun

2. In the Dell compellent create new volumes named “test”,  then click “map volume to server” and map it to the NAS.

Then on NexentaStor, use “show appliance” command, then choose syslog > dmesg

Sep 26 14:24:27 Melbourne scsi: [ID 583861 kern.info] sd7 at scsi_vhci0: unit-address g6000d310002ef9000000000000000009: conf f_sym
Sep 26 14:24:27 Melbourne genunix: [ID 936769 kern.info] sd7 is /scsi_vhci/[email protected]
Sep 26 14:24:27 Melbourne genunix: [ID 408114 kern.info] /scsi_vhci/[email protected] (sd7) online
Sep 26 14:24:27 Melbourne genunix: [ID 483743 kern.info] /scsi_vhci/[email protected] (sd7) multipath status: degraded: path 17 fp2/[email protected],5 is online
Sep 26 14:24:27 Melbourne genunix: [ID 530209 kern.info] /scsi_vhci/[email protected] (sd7) multipath status: optimal: path 18 fp0/[email protected],5 is online: Load balancing: round-robin
Sep 26 14:24:27 Melbourne genunix: [ID 530209 kern.info] /scsi_vhci/[email protected] (sd7) multipath status: optimal: path 19 fp0/[email protected],5 is online: Load balancing: round-robin
Sep 26 14:24:27 Melbourne genunix: [ID 530209 kern.info] /scsi_vhci/[email protected] (sd7) multipath status: optimal: path 20 fp2/[email protected],5 is online: Load balancing: round-robin
Command above means the Volume test has been successfully mapped as disk device sd7 to the NAS system.
3. If you use show lun now, you may not see the new attached lun. wait for about 20 minutes for the system to initialize.
use show lun
new_lun
Next you can create a volume from this Lun.
1. Type:
nmc:/$ setup volume create
The prompts guide you through a series of selections.
2. Enter a volume name at the prompt.
Example:
Volume: vol1
3. Create a group of devices for the volume by selecting one or more
options from the list using the arrow keys. Then press Enter.
Example:
Group of devices: (Use SPACEBAR for multiple selection)
c1t1d0
4. Select a redundancy type.
The number and type of options listed vary depending upon the
selections in Step 3. Options include: pool, mirror, RAID-Z1, RAIDZ2, and RAID-Z3.
Example:
Group redundancy type:
pool
5. Select a compression algorithm setting for this dataset. Press Enter
to accept the default, on.
6. Confirm the request to create the volume by typing y.
Example:
Create volume ‘vol1’? y

Step 2 create a Zvol for share
ZVOL

A zvol is a virtual block device on a volume. In effect, it is a LUN that is remotely accessible through the protocols supported by SCSI Target plugins. The zvol can be managed, compressed, replicated, have snapshots taken of it, and so on.

Creating a ZVOL
To provision storage over iSCSI or FC, you must create a zvol on an existing volume.
To create a zvol, using NMV:
1. Click Data Management > SCSI Target.
2. In the ZVOLS panel, click Create.
3. In the Create a New ZVOL window, fill in the required fields and click Create.

To create a zvol, using NMC:
1. Type:
nmc:/$ setup zvol create
2. Follow the prompts to enter the volume name, size, and other properties:

[email protected]:/$ setup zvol create
<Enter>   <help|-h> <?>
[email protected]:/$ setup zvol create
zvol name    : Zvol_test
zvol pathname must start with a name of the volume, and can only contain alphanumeric characters as well as underscore ('_'), das
('.') and forward slashes ('/'). The available volumes are: Vol_BBS, Vol_CMS, Vol_VID, Vol_WWW, Vol_test. Use forward slash '/' t
volume or folder name from the (new) block device name, for instance: Vol_BBS/new_zvol

[email protected]:/$ setup zvol create
zvol name    : Vol_test/new_zvol
zvol size    : 300GB
block size   : 128K
compression  : on
Create a thinly provisioned (sparse) device 'Vol_test/new_zvol', with no initial reservation? Note that a thinly provisioned virtl and then grows up to 300GB. (Press Yes to create a sparse device, No to allocate the entire specified size (300GB) right now)

PROPERTY                      VALUE
name                          Vol_test/new_zvol
size                          300G
volume                        Vol_test
usedbyrefreservation          0
reservation                   none
volsize                       300G
referenced                    16K
zvol_name                     new_zvol
checksum                      on
dedup                         off
readonly                      off
nms:hold
logbias                       latency
primarycache                  all
nms:swap                      no
nms:description
used                          16K
volume_name                   Vol_test
copies                        1
mountpoint
usedbydataset                 16K
size_bytes                    322122547200
size                          307200
compression                   on
usedbysnapshots               0
volblocksize                  128K
compressratio                 1.00x
available                     488G
mlslabel                      none
sync                          standard
usedbychildren                0
refreservation                none
secondarycache                all
creation                      Mon Sep 26 15:30 2016

Now we need to share the Zvol:

[email protected]:/$ setup zvol Vol_test/new_zvol  share
or use NMV
1. Click Data Management > SCSI Target.
2. In the ZVOLS panel, click View.
3. In the View ZVOLs window, click the name of the ZVOL.
4. Choose the Vol_test/new_zvol, then click share button.
5. Click Save.

share_zvol

Step 3 Create a  Target Portal Groups
Having created the network interfaces and Target Portal Groups limited to the necessary IPs, the next step is to create the iSCSI Targets themselves. iSCSI Targets are what iSCSI Initiators (clients) connect to.
You must create a target portal group before creating a ISCSI target.
The purpose of Target Portal Groups is to limit visibility of Targets to the IP addresses of any/all Target Portal Groups they are members of (and not to IPs they are not). Unfortunately, as of NexentaStor 3.1.3, COMSTAR, the SCSI target mode framework utilized by Nexenta, does not properly obey the purpose of TPGs. Targets that exist and are limited to specific Target Portal Groups still are visible to clients attempting to connect to other IPs on the system rather than those that are part of the TPG. This is a known issue, but will not affect the ability to follow this guide. Also, it is still a best practice to create these TPGs for when they do become functional.

TPG Configuration (NMC)
As of NexentaStor 3.1.3, it is not possible to manipulate Target Portal Groups in NMC. They must be configured in the web GUI.
TPG Configuration (NMV)
To configure, mouse-over “Data Management” and then click on “SCSI Target”―on the resulting page, click on the “Target Portal Groups” link in the iSCSI box on the left of the interface. If you’ve never configured a Target Portal Group before , you can click the link “here” at the end of the “You can create a new one here.” sentence to get to the creation page.
Enter a name and IP address of the nexentastore’s host machine, then click create.

 

Create a iSCSI target
In NMC, iSCSI Targets are created using the setup iscsi targetcommand, which then will lead you
through a set of menus. Here is how it starts:
Choose the Create option here, and then fill in the menu options. Note that you can leave the “Target Name” and “Target Alias” empty if you wish.

Leaving “Target Name” empty automatically generates a valid IQN, and “Target Alias” is merely an unused label to assist with identification by human administrators on the NexentaStor appliance and is not required for operation. When it gets to the “Target Portal Groups” section, type in “tpg0” (Your own name created before, without quotes), or whatever you labeled the first Target Portal Group,

This will create the iSCSI Target (it can take a minute to complete this action, be patient.

Then use command : show iscsi target

You will see the iqn.1986-03.com.sun:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx which can be used to connect from other host.

we will use windows 2012 server as the client and iSCSI initiator to connect to the LUN:

http://frankfu.click/microsoft/windows-2012/file-service/use-synology-nas-to-create-san-storage.html/#ConnecttotheLUN

Problems. Nexenta Community 3.0.3 / 3.0.4 Web UI Stops Working!
Case 1
Use putty or similar to SSH to the Nexenta box and use the root login
From the UNIX shell (#) run these commands:
1 [email protected]:/volumes# svcadm enable -rs apache2
2 [email protected]:/volumes# svcadm restart nmv
3 [email protected]:/volumes# svcadm restart nms
4 [email protected]:/volumes#
Note 1: Command from line 1 only needs to be run one time
Note 2: These commands are perfectly safe to run during the working day
If in the NMC shell ($), to get to the UNIX shell (#) run these commands:
[email protected]:/$ option expert_mode=1 -s
You are about to enter the Unix (“raw”) shell and execute low-level Unix command(s). Warning: using low-level Unix commands is not recommended! Execute? Yes
Case 2,
The certificate of the Nexentastor is expired
check the expiration date of the certificate, then fire up a virtual machine (Virtual box or VMware) , change the VM’s name to the date before the expiration date. Then type the ip address in the browser.
Case 3.
[email protected]:/$ destroy volume Vol_test
Destroy volume 'Vol_test' and destroy all associated shares (including nfs, cifs, rsync, ftp, and webdav shares (if any)) ?  Yes

SystemCallError: cannot open 'Vol_test': volume I/O is currently suspended
[email protected]:/$ zpool
  pool: Vol_test
 state: UNAVAIL
status: One or more devices are faulted in response to IO failures.
action: Make sure the affected devices are connected, then run 'zpool clear'.
   see: http://www.sun.com/msg/ZFS-8000-JQ
 scan: none requested
config:

        NAME                                     STATE     READ WRITE CKSUM
        Vol_test                                 UNAVAIL      0     0     0  insufficient replicas
          c4t6000D310002EF9000000000000000009d0  UNAVAIL      0     0     0  cannot open

use command:

[email protected]:/$ setup volume Vol_test clear-errors
then problem solved.