ISCSI set up

 ISCSI

- ISCSI stands for Internet Small Computer System Interface
- It is used for accessing raw partition over the network
- we will take space from SAN and will format, create FS
- Works on port No.3260
- Package name - isci-initiator-utils  [client]
- Service name - iscsid

ISCSI initiator     - A Client that needs access to SAN Storage
ISCSI target        - A remote hard disk pretended to be ISCSI server or target portal
ISCSI target portal    - A Server that provide target over network to initiator
IQN                    - SCSI Qualified Name

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        SCSI Server

# yum install scsi-target-utils -y
# fdisk /dev/sda
  Create a partition          // - /dev/sda4
# partx -a /dev/sda
# vim /etc/tgt/target.conf
  Copy/Paste 31,32,33 line + (Shift+G) + Paste
umcomment  <target in 2012-09:com.example:comment="">
umcomment  backline-storage  /dev/sda4            // Partiotion number, Also LVM path is LVM
       </target>
           :wq
# service tgtd start
# chkconf tgtd on
# tgt-admin -show

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        ISCSI Client

# yum install iscsi-inititator-utils -y
# man isciadm        [to see the sample command]
# iscsiadm --mode discoverydb --type sendtarget --portal 192.168.0.20 --discover    // IQN will be searched. SCSI qualified name
# iscsiadm --mode node --targetname paste IQN --portal 192.168.0.20 --login        // to login
# car /var/log/message                                    // Attached SCSI disk
# dmesg                                            // show the attached SCSI disk
# fdisk /dev/sdb                                    // dmesg will show sdX
# format the partition
# vim /etc/fstab
  UUID    /scsi   ext4   _netdev   0 0
  :wq
# mount -a
# iscsiadm --mode node --targetname paste IQN --portal 192.168.0.20 --logout        // to logout
# chkconf iscsi on

After Reboot of the machin, Lost+Found folder will exists under /scsi (then successful)

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