iSCSI (Internet Small Computer System Interface) - an Internet Protocol (IP)-based to provide data storage over network.
Protocol: tcp
Default port: 3260
System A, Target. IP: 10.10.10.1
Install:
yum install scsi-target-util
Configuration. There is example in configuration file /etc/tgt/targets.conf, and unused /dev/sdb:
# Sample target with one LUN only. Defaults to allow access for all initiators:
#<target iqn.2008-09.com.example:server.target1>
# backing-store /dev/LVM/somedevice
#</target>
<target khmel.org:disk-1>
backing-store /dev/sdb
</target>
Autostart:
chkconfig tgtd on
Start service:
service tgtd start
System B, Initiator. IP: 10.10.10.2
Install:
yum install iscsi-initiator-utils
There is example in "man iscsiadm", how to discover new disks:
iscsiadm --mode discoverydb --type sendtargets --portal 10.10.10.1 --discover 10.10.10.1:3260,1 khml.org:disk-1
Autostart and start:
chkconfig iscsi on
service iscsi start
Verify status to find name of new disk:
service iscsi status
. . .
Attached scsi disk sdc State: running
Now file system can be created:
mkfs.ext4 /dev/sdc
mount /dev/sdc /mnt
During restart service use information from:
/var/lib/iscsi/nodes/
/var/lib/iscsi/send_targets/