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Terminology

multipath

Implementations

Features comparison between Linux SCSI targets

IET

iSCSI Enterprise Target

ietd
ietadm
iscsitarget
iscsid

LIO

targetcli

SCST

iSCSI Target Driver

scst

STGT

Predecessor of LIO

ISTGT

iSCSI Target

FreeBSD/Linux

istgtcontrol and friends

Comstar

Commands:

itadm
stmfadm

TGT

Linux iSCSI Target

tgtd
tgdadm

open-iscsi

iscsiadm?

another one

Nameless one used on BSD

iscsid
iscsictl

And there's tgt

FAQ

On ISCSI client

Find targets

iscsi_discovery 192.168.100.32

Please logout from all targets on 192.168.178.3:3260 before trying to run discovery on that portal

??

List connected targets

iscsiadm -m session -P 3

which seems to list only one, for multiple:

tgtadm --lld iscsi --op show --mode conn --tid 1

but that needs more work

List targets

iscsiadm -m discovery -t sendtargets -p 192.168.100.32

Connect to target

iscsiadm -m node --targetname="iqn.2018-5.mynet:drbd0" --portal "192.168.100.32" --login

if you get things like "iscsiadm: No records found" try a thing like

iscsiadm --mode node -l all

iscsiadm: Could not log into all portals:

Disconnect from target

iscsiadm -m node -T iqn.2018-5.mynet:drbd0 -p 192.168.100.32 -u

Show session id

iscsiadm -m session -P 1

Rescan ??

iscsiadm -m node --targetname="foo.bar" -R

Disconnect all targets

iscsiadm --mode node -u all

Rescan session

iscsiadm -m session -r SID --rescan⁠

iscsiadm: Could not log into all portals

??

On server

list targets

tgtadm --lld iscsi --mode target --op show

list connected targets

To list all connections to target with id 1:

tgtadm --lld iscsi --mode conn --op show --tid 1

And disconnect target:

tgtadm --lld iscsi --op delete --mode conn --tid 1 --sid 2 --cid 0

Create iscsi target and Lun

tgtadm --lld iscsi --mode target --op new --tid=1 --targetname iqn.2009-02.com.example:for.all
tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 -b /var/tmp/iscsi-disk1

Delete iscsi target and Lun

tgtadm --lld iscsi --mode logicalunit --op delete --tid 1 --lun 1
tgtadm --lld iscsi --mode target --op delete --tid=1

Reload tgtd configuration

tgt-admin --update ALL

or

tgt-admin --update your.irqn.string

Show tgdt config

tgt-admin --dump

Grow/resize target

After resizing the target (lvresize or whatever)

tgt-admin --update tid=xx -v -f

Show targets

tgt-admin -s

Show target config

This includes target parameters

tgtadm --lld iscsi -o show -m target --tid=1

The disk contains an unclean file system (0, 0).

Metadata kept in Windows cache, refused to mount.
Falling back to read-only mount because the NTFS partition is in an
unsafe state. Please resume and shutdown Windows fully (no hibernation
or fast restarting.)

ntfsfix /dev/sdc1

On ESXi

esxcli storage core path list
storage core adapter rescan --adapter=vmhba
esxcli iscsi adapter discovery rediscover --adapter vmhba64
esxcli iscsi adapter param get -A vmhba64

Error messages

connection1:0: detected conn error (1020)

These messages are seen when an iSCSI connection times out (1011 means timeout on initiator side and 1020 means the target dropped the connection)

tgtadm: failed to send request hdr to tgt daemon, Transport endpoint is not connected

tgtd not running :)

tgtd: iser_ib_init(3436) Failed to initialize RDMA; load kernel modules?

comment out default-driver

iscsiadm: No portals found

ACL issue, try something like

tgtadm --lld iscsi --op bind --mode target --tid 6 -I ALL

iscsiadm: No records found

Try

iscsiadm -m discovery -t sendtargets -p <ip-address>

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