Difference between revisions of "Iscsi"

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=FAQ=
 
=FAQ=
  
==On ISCSI client==
+
 
 +
== On ISCSI client ==
  
 
=== Find targets ===
 
=== Find targets ===
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  iscsi_discovery 192.168.100.32
 
  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
 
Please logout from all targets on 192.168.178.3:3260 before trying to run discovery on that portal
  
 
??
 
??
  
===List connected targets===
+
=== List connected targets ===
 +
 
 
  iscsiadm -m session -P 3
 
  iscsiadm -m session -P 3
 +
 
which seems to list only one, for multiple:
 
which seems to list only one, for multiple:
  
 
  tgtadm --lld iscsi --op show --mode conn --tid 1
 
  tgtadm --lld iscsi --op show --mode conn --tid 1
 +
 
but that needs more work
 
but that needs more work
  
===List targets===
+
=== List targets ===
 +
 
 
  iscsiadm -m discovery -t sendtargets -p 192.168.100.32
 
  iscsiadm -m discovery -t sendtargets -p 192.168.100.32
  
===Connect to target===
+
=== Connect to target ===
 +
 
 
  iscsiadm -m node --targetname="iqn.2018-5.mynet:drbd0" --portal "192.168.100.32" --login
 
  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
 
if you get things like "iscsiadm: No records found" try a thing like
 +
 
  iscsiadm --mode node -l all
 
  iscsiadm --mode node -l all
  
===Disconnect from target===
+
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
 
  iscsiadm -m node -T iqn.2018-5.mynet:drbd0 -p 192.168.100.32 -u
  
 +
 
 +
 +
=== Show session id ===
  
===Show session id===
 
 
  iscsiadm -m session -P 1
 
  iscsiadm -m session -P 1
  
 +
 
  
===Rescan ??===
+
=== Rescan ?? ===
  
 
  iscsiadm -m node --targetname="foo.bar" -R
 
  iscsiadm -m node --targetname="foo.bar" -R
  
===Disconnect all targets===
+
=== Disconnect all targets ===
 +
 
 
  iscsiadm --mode node -u all
 
  iscsiadm --mode node -u all
  
===Rescan session===
+
=== Rescan session ===
 +
 
 
  iscsiadm -m session -r SID --rescan⁠
 
  iscsiadm -m session -r SID --rescan⁠
  
 +
 +
===iscsiadm: Could not log into all portals===
 +
??
  
 
== On server ==
 
== On server ==

Revision as of 19:13, 25 August 2021


Links

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>