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--- nndocs:iscsi [2024/02/12 16:25] – created naptastic
+++ nndocs:iscsi [2025/01/03 02:32] (current) – [Initiator] naptastic
@@ Line 1: / Line 1: @@
-TODO: Make all the initiator and target names match please
+TODO: Explain why I don't have iSCSI boot working yet, please
-TODO: Find out if the :blah section is actually needed for the IQN or if I can drop it
 =====Target=====
@@ Line 16: / Line 15: @@
     > portals/ create 172.19.12.1 3260
     > portals/172.19.12.1:3260 enable_iser boolean=true
-TODO: enable_iser doesn't work on shark. Any ideas why yet? Or is it just time to nuke and re-pave?
 =====Initiator=====
@@ Line 25: / Line 22: @@
 ===Login. Must use a node record id found by the discovery===
-    iscsiadm --mode node --targetname iqn.2001-05.com.doe:test --portal 172.20.64.11:3260 --login
+    iscsiadm --mode node --targetname iqn.2014-08.rocks.narf.southpark --portal 172.20.64.11:3260 --login
 [[https://www.thegeekdiary.com/iscsi-connection-command-examples-cheat-sheet/]]
@@ Line 32: / Line 29: @@
     # iscsiadm -m session
-    tcp: [1] 172.21.0.80:3260,1 iqn.2003-01.org.linux-iscsi.happy.x8664:sn.9eb52ac74563 (non-flash)
+    tcp: [1] 172.20.0.80:3260,1 iqn.2014-08.rocks.narf.southpark (non-flash)
 The session number (sid) is the 1 in brackets.
+===Use iSER instead of TCP (initiator side)===
+If performance is poor, the initiator may have logged in using TCP instead of iSER. In my testing, to a ramdisk over IB, TCP got ~520 MiB/s, where with iSER I have gotten 3.2 GB/s.
+You know you got TCP if dmesg describes your LUN like this:
+    [123.45678] scsi host1: iSCSI Initiator over TCP/IP
+    [123.45678] scsi 1:0:0:0: Direct-Access     LIO-ORG  volume       4.0  PQ: 0 ANSI: 6
+It should say iSER instead of TCP/IP. Log out of that session, then run this command. It also logs in, which makes me wonder if the initiator name argument above is necessary.
+    iscsi_discovery 172.20.64.13 -t iser -l
+Now dmesg should show something more like this:
+    [123.45678] scsi host1: iSCSI Initiator over iSER
+    [123.45678] scsi 1:0:0:0: Direct-Access     LIO-ORG  volume       4.0  PQ: 0 ANSI: 6
 ===Rescan after the target adds a LUN===
     # iscsiadm -m session --sid=1 --rescan
-    Rescanning session [sid: 1, target: iqn.2003-01.org.linux-iscsi.happy.x8664:sn.9eb52ac74563, portal: 172.21.0.80,3260]
+    Rescanning session [sid: 1, target: iqn.2014-08.rocks.narf.southpark, portal: 172.20.0.80,3260]
 ===Log out when you're done (very, very carefully)===