Section 14: SAN Setup on CentOS 5.3

From The FluidVM Wiki

Contents 1 Procedures to create and expose a SAN target 2 Note 3 Description 4 See Also

Procedures to create and expose a SAN target

1. Get tgtd installed in the machine you intend to use as SAN Server.

   Debian: sudo apt-get install tgt
   RPM    : sudo yum install tgtd

2. Create iSCSI Storage Target.

    Description: They are just UNIQUE names by which you wish to export your Storage resource. An iSCSI target usually represents nothing but hard disk storage.
   tgtadm --lld iscsi --op new --mode target --tid {1} -T {iqn.2001-04.com.example:sanstorage.disk1.com}
   tgtadm --lld iscsi --op new --mode target --tid {2} -T {iqn.2001-04.com.example:sanstorage.disk2.com}

3. Associate a logical storae unit to already created target

   tgtadm --lld iscsi --op new --mode logicalunit --tid {1} --lun {1} -b {/dev/sdb1}
   tgtadm --lld iscsi --op new --mode logicalunit --tid {1} --lun {2} -b {/dev/sdb2}

      tgtadm --lld iscsi --op new --mode logicalunit --tid {2} --lun {1} -b {/dev/sdc1}
   tgtadm --lld iscsi --op new --mode logicalunit --tid {2} --lun {2} -b {/dev/sdc2}

4. To enable Target created in step 2 to accept initiator connections from systems which require SAN storage

      tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL
      tgtadm --lld iscsi --op bind --mode target --tid 2 -I ALL

5. View targets

      tgtadm --lld iscsi --op show --mode target

Note

        * Please remove {} that's That's been used in the above scripts.  
        * needs root permission to execute these commands. 
        * tgtd services should be ON (/etc/init.d/tgtd start)

Description

           * Storage targets are normal block devices that you can see in a system. You can expose them across your network so that All other machines can access this exposed block devices as central storage.
           * Install tgtd as per the distro and start services. Each targets should have a Unique integer ID and a Unique name. Refer step 2
           * You can then attach blocks to the targets. Each block can be attached to a separate target or you can attach many blocks to a single target just by altering lun number Refer step 3
           * Once the association is done, You can expose them across your network using the command in step 4
           * To verify if things have gone well, use command in step 5 to view all exposed targets.
           * FluidVM will pick up these targets provided all above steps passed smoothly.

See Also

Security Groups Appendix – A: Managing Openfiler iSCSI SANs