Differences

This shows you the differences between two versions of the page.

--- linux_wiki:iscsi [2015/12/17 15:29]
billdozor created
+++ linux_wiki:iscsi [2019/05/25 23:50] (current)
@@ Line 1: / Line 1: @@
-====== Iscsi ======
+====== iSCSI ======
 **General Information**
@@ Line 6: / Line 6: @@
 **Checklist**
-  * Enterprise Linux 6
+  * Distro(s): Enterprise Linux 6/7
+----
+====== Adding Disks =====
+  - Get the iscsi initiator name on the client<code bash>cat /etc/iscsi/initiatorname.iscsi</code>
+  - Use the initiator name to configure the Host Group, LUN, and Host Affinity on your storage device. (Or send the initiator name to the storage admin)
+  - From the client, discover the available LUNs on the storage device<code bash>iscsiadm --mode discovery -t sendtargets --portal <storage-ip-address></code>
+  - Start and enable the iscsi daemon
+    - EL6<code bash>service iscsid start
+chkconfig iscsid on</code>
+    - EL7<code bash>systemctl start iscsid
+systemctl enable iscsid</code>
+  - Log-in to the LUN with the iscsi client<code bash>iscsiadm --mode node --targetname <iqn-LUN#-here> --portal <storage-ip-address>:<port> --login</code>
+  - Create /etc/multipath.conf if it doesn't exist<code bash>mpathconf --enable</code>
+  - Configure multipath<code bash>vim /etc/multipath.conf
+# Blacklist exception for your device
+blacklist_exceptions {
+    # WWN of LUN via iSCSI LUN group
+    wwid "123456789"
+}
+# Setup your storage device specifics
+devices {
+      device {
+              vendor "DELL"
+              product "MODEL-HERE"
+              # specify other options
+      }
+ }
+# Setup the multipath
+multipaths {
+   multipath {
+      wwid 123456789
+      alias friendly_name_here
+   }
+}
+</code>
+  - Start and enable multipathd
+    - EL6<code bash>service multipathd start
+chkconfig multipathd on</code>
+    - EL7<code bash>systemctl start multipathd
+systemctl enable multipathd</code>
+  - Re-scan the scsi bus<code bash>echo "- - -" > /sys/class/scsi_host/<host_number>/scan</code>
+    - Where <host_number> is something like: host0 (there will probably be host0-3)
+    - The hyphens represent controller,channel,lun, so – - – indicates all controllers, all channels, and all luns should be scanned.
+  - Verify paths<code bash>multipath -ll</code>
+  - Add mount entry to /etc/fstab
 ----
@@ Line 66: / Line 116: @@
 After, restart multipathd to ensure it doesn't come back
-<code bash>
+  * EL6<code bash>service multipathd restart</code>
-service multipathd restart
+  * EL7<code bash>systemctl restart multipathd</code>
-</code>
 ----