iscsi tools: use open-isns services

This replaces the native isns code with open-isns's libisns.
I included the open-isns code in the open-iscsi tarball
to make distribution easier since some distros use different
isns clients and may not want to carry open-isns.
This is based on open-isns commit
5e09f36d3446e41de0b8361601ffec4cd140d513.

Changes in iSNS behavior/use:

- To do discovery you must pass the ip and optionally the
port to iscsiadm:

iscsiadm -m discovery -t st -p 10.15.0.9

This command accepts the same ops as sendtargets so you can
add/remove/update the node records that are created.

It also supports ifaces properly now.

- isns.address and isns.port in iscsid.conf are no longer
used.

- ESI is temporarily not supported. This will be fixed in the
next patch when SCNs support is added.

- The iscsiadm isns discovery command is not marked as stable.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>

1 files changed, 3 insertions, 7 deletions

diff --git a/README b/README
index c2aa7fa..b6fd1eb 100644
--- a/README
+++ b/README
@@ -913,14 +913,10 @@ iscsiadm -m discovery -t sendtargets -p ip:port
 
 where "ip" is the address of the portal and port is the port.
 
-Or you can you perform discovery using iSNS by setting the address
-of the iSNS server in iscsid.conf with the "isns.address" value and
-running:
+To use iSNS you can run the discovery command with the type as "isns"
+and pass in the ip:port:
 
-iscsiadm -m discovery -t isns
-
-*** Warning *** iSNS support is experimental in this release. The command
-line options for it will change in future releases.
+iscsiadm -m discovery -t isns -p ip:port
 
 Both commands will print out the list of all discovered targets and their
 portals: