Solaris 11 has integrated with COMSTAR to configure ISCSI devices. You can easily setup COMSTAR ISCSI target and make the volume available over the network. As you know ISCSI is very cheap compare to our traditional SAN environment.With help of Infiniband interface, I am sure we can definitely match the FC SAN performance on ISCSI devices.Here we will see how to configure Solaris 11 as ISCSI storage server and creating new ISCSI targets for network access.In the end the article, we also how to add the ISCSI targets in Solaris 11 servers (ISCSI initiator).
COMSTAR uses SMF service repository to store its configuration and logical unit mapping.
COMSTAR’s target mode framework runs as stmf in SMF service.
ISCSI Solaris server: SOL11-ISCSI (Solaris 11)
Client: Unixarena (Any host.Here i have shown the example in Solaris)
Login to Solaris 11 system which is going to act a ISCSI server
1.Try to enable stmf service in SMF.
SOL11-ISCSI:~# svcadm enable stmf svcadm: Pattern 'stmf' doesn't match any instances SOL11-ISCSI:~#
2.As per the above command output, stmf(COMSTART storage server) is not installed.Let me install it now.
SOL11-ISCSI:~# pkg install group/feature/storage-server
Packages to install: 20
Create boot environment: No
Create backup boot environment: Yes
Services to change: 1
DOWNLOAD PKGS FILES XFER (MB) SPEED
Completed 20/20 1023/1023 54.5/54.5 0B/s
PHASE ITEMS
Installing new actions 1863/1863
Updating package state database Done
Updating image state Done
Creating fast lookup database Done
SOL11-ISCSI:~#
3.Try to enable stmf service and verify the service status.
SOL11-ISCSI:~# svcadm enable stmf SOL11-ISCSI:~# svcs stmf STATE STIME FMRI online 13:01:31 svc:/system/stmf:default SOL11-ISCSI:~#
4.Create a new zpool to share the storage with other systems.
SOL11-ISCIS:~# zpool create sanpool c1t0d0 c1t2d0 SOL11-ISCSI:~# zfs create -V 1g sanpool/LUN1
5.Create a new LUN from the zfs volume using stmfadm.
SOL11-ISCSI:~# stmfadm create-lu /dev/zvol/rdsk/sanpool/LUN1 Logical unit created: 600144F0B418030000005281E05C0001 SOL11-ISCSI:~#
6. Verify the newly created LUN.
SOL11-ISCSI:~# stmfadm list-lu LU Name: 600144F0B418030000005281E05C0001 SOL11-ISCSI:~#
7.Make the LUN to visible over the network. Adding LUN view.
Note:You can also restrict the luns to access specific host.
SOL11-ISCSI:~# stmfadm add-view 600144F0B418030000005281E05C0001
SOL11-ISCSI:~# stmfadm list-view -l 600144F0B418030000005281E05C0001
View Entry: 0
Host group : All
Target Group : All
LUN : Auto
SOL11-ISCSI:~#
8.Enable the ISCSI target service and check the service status.
SOL11-ISCSI:~# svcadm enable -r svc:/network/iscsi/target:default SOL11-ISCSI:~# svcs /network/iscsi/target STATE STIME FMRI online 13:32:29 svc:/network/iscsi/target:default SOL11-ISCSI:~#
9.Create a new ISCSI target,
SOL11-ISCSI:~# itadm create-target
Target iqn.1986-03.com.sun:02:473cb729-b40c-684e-fffe-9cbe01d94f70 successfully created
SOL11-ISCSI:~# itadm list-target -v
TARGET NAME STATE SESSIONS
iqn.1986-03.com.sun:02:473cb729-b40c-684e-fffe-9cbe01d94f70 online 0
alias: -
auth: none (defaults)
targetchapuser: -
targetchapsecret: unset
tpg-tags: default
SOL11-ISCSI:~#
10.If you would like to backup the configuration of COMSTAR,use the below command.
SOL11-ISCSI:~# svccfg export -a stmf > /root/stmf.config
Any time you can import the configuration using svccfg import file_name command.
ISCSI Client
Login to Unixarena which is our client machine.
1.Enable the ISCSI intiator service
root@UnixArena:~# svcadm enable network/iscsi/initiator root@UnixArena:~# svcs -a network/iscsi/initiator svcs: -a ignored when used with arguments. STATE STIME FMRI online 10:51:59 svc:/network/iscsi/initiator:default root@UnixArena:~#
2.Add the newly created target using iscsiadm command.
root@UnixArena:~# iscsiadm static-config iscsiadm: invalid subcommand Usage: iscsiadm -?,-V Usage: iscsiadm add [-?] OBJECT [-?] [operand] Usage: iscsiadm list [-?] OBJECT [-?] [operand] Usage: iscsiadm modify [-?] OBJECT [-?] [operand] Usage: iscsiadm remove [-?] OBJECT [-?] [operand] For more information, please see iscsiadm(1M) root@UnixArena:~# UnixArena:~# iscsiadm add static-config iqn.1986-03.com.sun:02:473cb729-b40c-684e-fffe-9cbe01d94f70,192.168.2.32:3260 UnixArena:~# iscsiadm list static-config Static Configuration Target: iqn.1986-03.com.sun:02:473cb729-b40c-684e-fffe-9cbe01d94f70,192.168.2.32:3260 UnixArena:~# UnixArena:~# iscsiadm modify discovery --static enable
Command format: iscsiadm add static-config target:iscsi_server_ip:port
3.Check the new LUN using format command.Solaris 11 scanned the new ISCSI lun and make it visible in format command.But in Solaris 10 , you need to scan it manually.
UnixArena:~# echo|format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
0. c0t600144F0B418030000005281E05C0001d0 SUN-COMSTAR-1.0 cyl 1022 alt 2 hd 64 sec 32>
/scsi_vhci/disk@g600144f0b418030000005281e05c0001
1. c8t0d0 VMware,-VMware Virtual S-1.0-16.00GB>
/pci@0,0/pci15ad,1976@10/sd@0,0
2. c8t1d0 VMware,-VMware Virtual S-1.0-16.00GB>
/pci@0,0/pci15ad,1976@10/sd@1,0
Specify disk (enter its number): Specify disk (enter its number):
UnixArena:~#
You can also add the LUN;s in Linux.Here is the example show in redhat linux.
The sad side is that , we can’t use these LUNS in veritas cluster I/O fencing or redhat cluster fencing due to incompatibility of SCSI-3 persistent reservation.Here is the test which i have performed to confirm whether the LUN is supporting SCSI-3 PR or not using vxfentsthdw command which is part of veritas cluster bundle.
root@UnixArena:~# /opt/VRTSvcs/vxfen/bin/vxfentsthdw
Veritas vxfentsthdw version 6.0PR1 Solaris
The utility vxfentsthdw works on the two nodes of the cluster.
The utility verifies that the shared storage one intends to use is
configured to support I/O fencing. It issues a series of vxfenadm
commands to setup SCSI-3 registrations on the disk, verifies the
registrations on the disk, and removes the registrations from the disk.
******** WARNING!!!!!!!! ********
THIS UTILITY WILL DESTROY THE DATA ON THE DISK!!
Do you still want to continue : [y/n] (default: n) y
The logfile generated for vxfentsthdw is /var/VRTSvcs/log/vxfen/vxfentsthdw.log.4890
Enter the first node of the cluster:
Unixarena
Enter the second node of the cluster:
Unixarena1
Enter the disk name to be checked for SCSI-3 PGR on node Unixarena in the format:
for dmp: /dev/vx/rdmp/cxtxdxs2
for raw: /dev/rdsk/cxtxdxs2
Make sure it is the same disk as seen by nodes Unixarena and Unixarena1
/dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
Enter the disk name to be checked for SCSI-3 PGR on node Unixarena1 in the format:
for dmp: /dev/vx/rdmp/cxtxdxs2
for raw: /dev/rdsk/cxtxdxs2
Make sure it is the same disk as seen by nodes Unixarena and Unixarena1
/dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
***************************************************************************
Testing Unixarena /dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
Unixarena1 /dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
Evaluate the disk before testing
........................ No Pre-existing keys
RegisterIgnoreKeys on disk /dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
from node Unixarena Passed
Verify registrations for disk /dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
on node Unixarena Passed
RegisterIgnoreKeys on disk /dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
from node Unixarena1 Passed
Verify registrations for disk /dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
on node Unixarena1 Passed
Unregister keys on disk /dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
from node Unixarena Passed
Verify registrations for disk /dev/rdsk/c0t600144F0B418030000005281E05C0001d0s2
on node Unixarena1 Failed
Unregistration test for disk failed on node Unixarena1.
Unregistration from one node is causing unregistration of keys from the other node.
Disk is not SCSI-3 compliant on node Unixarena1.
Execute the utility vxfentsthdw again and if failure persists contact
the vendor for support in enabling SCSI-3 persistent reservations
Removing test keys and temporary files, if any...
root@UnixArena:~#
As per the above results,you can see the ISCSI luns are not supporting the SCSI-3 PR.
Hope very soon we can expect this work on Solaris 11.
This ISCSI LUN can be used in all volume manager like SVM,VXVM,LVM and ZFS and it works great.
Please leave a comment if you have any doubt.Thank you for visiting UnixArena.
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