iSCSI in SystemD

[root@rdo1 iscsi(keystone_admin)]# systemctl list-unit-files iscsi.service

UNIT FILE     STATE  

iscsi.service enabled

1 unit files listed.

[root@rdo1 iscsi(keystone_admin)]# systemctl list-unit-files multipathd.service

UNIT FILE          STATE  

multipathd.service enabled

1 unit files listed.

Interesting iscsid.conf Optimization Settings

iscsid.startup = /usr/sbin/iscsid

node.session.err_timeo.lu_reset_timeout = 30

node.session.err_timeo.tgt_reset_timeout = 30

node.session.nr_sessions = 3

node.session.timeo.replacement_timeout = 5

node.startup = automatic

Connect to iSCSI Target using Windows PowerShell

Connect-IscsiTarget -InitiatorPortalAddress 172.168.1.27 -IsMultipathEnabled $true -IsPersistent $true -TargetPortalAddress 172.18.226.11 -NodeAddress iqn.2010-9.com.nodo:bg6064h0073d000e

Useful WireShark Filters

Find iSCSI traffic between two IP addresses:

iscsi && ((ip.addr==110.47.46.100 || ip.addr==110.17.45.168))

Find all iSCSI writes:

scsi_sbc.sa == 0x10

Useful iSCSI Commands

iscsiadm --mode discovery -t st -p 10.46.216.11

iscsiadm -m node -l

iscsiadm -m session

multipath -ll

Create a multi-session setup in VMWare ESXi v5.x

~ # esxcli iscsi session list
vmhba37,iqn.2013-12.com.reduxio:alpha1,00023d000001
   Adapter: vmhba37
   Target: iqn.2013-12.com.reduxio:alpha1
   ISID: 00023d000001
   TargetPortalGroupTag: 1
   AuthenticationMethod: none
   DataPduInOrder: true
   DataSequenceInOrder: true
   DefaultTime2Retain: 0
   DefaultTime2Wait: 2
   ErrorRecoveryLevel: 0
   FirstBurstLength: 65536
   ImmediateData: true
   InitialR2T: true
   MaxBurstLength: 262144
   MaxConnections: 1
   MaxOutstandingR2T: 1
   TSIH: 256
~ #
~ # esxcli iscsi session add -A vmhba37
~ # esxcli iscsi session add -A vmhba37 -s 00023d000001 -n iqn.2013-12.com.reduxio:alpha1
~ # esxcli iscsi session add -A vmhba37 -s 00023d000001 -n iqn.2013-12.com.reduxio:alpha1
~ # esxcli iscsi session add -A vmhba37 -s 00023d000001 -n iqn.2013-12.com.reduxio:alpha1
~ # esxcli iscsi session add -A vmhba37 -s 00023d000001 -n iqn.2013-12.com.reduxio:alpha1
~ # esxcli iscsi session add -A vmhba37 -s 00023d000001 -n iqn.2013-12.com.reduxio:alpha1
~ # esxcli iscsi session add -A vmhba37 -s 00023d000001 -n iqn.2013-12.com.reduxio:alpha1
~ # esxcli iscsi session add -A vmhba37 -s 00023d000001 -n iqn.2013-12.com.reduxio:alpha1

Create a multi-session iSCSI setup in Linux

root@mktgmysql3:~#  iscsiadm --mode session
tcp: [1] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
root@mktgmysql3:~# iscsiadm --mode session -r 1 --op new
Logging in to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] (multiple)
Login to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] successful.
root@mktgmysql3:~# iscsiadm --mode session
tcp: [1] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
tcp: [2] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
root@mktgmysql3:~# iscsiadm --mode session -r 1 --op new
Logging in to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] (multiple)
Login to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] successful.
root@mktgmysql3:~# iscsiadm --mode session -r 1 --op new
Logging in to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] (multiple)
Login to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] successful.
root@mktgmysql3:~# iscsiadm --mode session -r 1 --op new
Logging in to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] (multiple)
Login to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] successful.
root@mktgmysql3:~# iscsiadm --mode session -r 1 --op new
Logging in to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] (multiple)
Login to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] successful.
root@mktgmysql3:~# iscsiadm --mode session -r 1 --op new
Logging in to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] (multiple)
Login to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] successful.
root@mktgmysql3:~# iscsiadm --mode session -r 1 --op new
Logging in to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] (multiple)
Login to [iface: default, target: iqn.2013-12.com.reduxio:red2, portal: 172.17.40.35,3260] successful.
root@mktgmysql3:~# iscsiadm --mode session
tcp: [1] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
tcp: [2] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
tcp: [3] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
tcp: [4] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
tcp: [5] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
tcp: [6] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
tcp: [7] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
tcp: [8] 172.17.40.35:3260,1 iqn.2013-12.com.reduxio:red2
root@mktgmysql3:~#