SAN Setup on CentOS 5.3

From The FluidVM Wiki

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.

    Targets 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 storage 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

        * 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.