ISCSI
From PrgmrWiki
Contents
Terms
- Server -> target(s)
- Individual share -> logical unit
- Target -> Group of logical units
- Client -> Initiator
Targets
Minimum properties
Target
- Name
- Target ID (may be autogenerated rather than assigned)
Logical unit
- Target it belongs to, specified by id
- Backing store path
Package
scsi-target-utils
Files
- /etc/tgt/targets.conf
- /etc/init.d/tgtd
- /etc/sysconfig/iptables
iptables minimal editing example
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3260 -j ACCEPT #please edit to further constrain
targets.conf minimal editing example
<target alice> backing-store /dev/mapper/volume-alice </target>
Commands
tgtadm --op show --mode target #show current targets tgtadm --lld iscsi --op new --mode target --tid 2 --targetname bob #hot-add new target tgtadm --op new --mode logicalunit --tid 2 --lun 1 --backing-store /dev/mapper/volume-bob --lld iscsi #hot-add new logical unit tgtadm --lld iscsi --op bind --mode target --tid 2 -I ALL #allow all initiators to access a target tgtadm --lld iscsi --op unbind --mode target --tid 2 -I ALL #remove all access to a target tgtadm --lld iscsi --op bind --mode target --tid 2 -I 172.16.10.133 #allow particular ip to access, can also be accomplished using iptables tgtadm --mode target --op delete --tid 2 #remove unused target
Initiators
Package
open-iscsi
Files
/etc/iscsi/iscsid.conf
iscsid.conf minimal editing example
node.startup = manual
Commands
iscsiadm --mode discovery -t sendtargets --portal 172.16.10.156 #required before trying to connect to a new device iscsiadm -m node -T bob --portal 172.16.10.156 --op update -n node.startup -v automatic #make connecting to bob automatic at startup iscsiadm --mode node --targetname bob --portal 172.16.10.156 --login ls /dev/disk/by-path/ | grep bob #find bobs disk iscsiadm --mode node --logout --targetname bob #logout one iscsiadm --mode session --logout #logout all iscsiadm -m node -T bob --portal 172.16.10.156 --op update -n node.startup -v manual #disable connecting to bob automatically at startup
