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--- aix:vios_ssp [2023/04/04 01:20]
manu
+++ aix:vios_ssp [2025/11/17 18:01] (current)
manu
@@ Line 1: / Line 1: @@
 ====== Using Shared Storage Pools on VIOS ======
+https://github.com/nigelargriffiths/Shared-Storage-Pool-Tools
+https://www.ibm.com/support/pages/shared-storage-pool-ssp-best-practice
+https://www.ibm.com/support/pages/shared-storage-pools-cheat-sheet
+===== What is a SSP ? =====
+It can be compared to a datastore into the VMware world, with some differences
+{{:aix:vios_ssp01.png?800|}}
+===== Stop/start a cluster SSP =====
+To take a node offline for maintenance, type the command as follows:
+<cli prompt='$'>
+$ clstartstop -stop -n clustername -m nodeA
+</cli>
+To bring the node back online after maintenance is completed, type the command as follows:
+<cli prompt='$'>
+$ clstartstop -start -n clustername -m nodeA
+</cli>
+To take all the nodes offline for maintenance, type the command as follows:
+<cli prompt='$'>
+$ clstartstop -stop -n clustername -a
+</cli>
+To bring all the nodes back online after maintenance is completed, type the command as follows:
+<cli prompt='$'>
+$ clstartstop -start -n clustername -a
+</cli>
+===== Custom script =====
 So here is a quick one line script "ncluster"
@@ Line 74: / Line 107: @@
 Here is another example after the SSP5 has noticed all the VIOS are at the higher level
+<cli prompt='$'>
 No State Repos Pool Role ---Upgrade-Status--- Node-Name
     OK    OK   OK         2.2.4.10 ON_LEVEL bronzevios1.aixncc.uk.ibm.com
@@ Line 81: / Line 114: @@
     OK    OK   OK         2.2.4.10 ON_LEVEL orangevios1.aixncc.uk.ibm.com
     OK    OK   OK  DBN    2.2.4.10 ON_LEVEL redvios1.aixncc.uk.ibm.com
-$
+</cli>
@@ Line 180: / Line 213: @@
+<cli prompt='$'>
 $ nlu -?
 /home/padmin/nlu Nigel's lu command with improved layout and column ordering
 /home/padmin/nlu [-sizemb | -usedmb | -used | -type | -tier | -name (default)]
-$
+</cli>
 Example default output by LU Name - my favourite default
+<cli prompt='$'>
 $ nlu
  SizeMB  UsedMB Used%  Type  Tier Name
@@ Line 198: / Line 231: @@
     2562    6%  THIN  test vm97boot
       23    0%  THIN  test vm97data
-$
+</cli>
 Example output reordered by column
+<cli prompt='$'>
 $ nlu -sizemb
  SizeMB  UsedMB Used%  Type  Tier Name
@@ Line 232: / Line 265: @@
     2562    6%  THIN  test vm97boot
       23    0%  THIN  test vm97data
+</cli>
 Here is the actual ksh script for nlu that is Nigel's New lu command
@@ Line 250: / Line 284: @@
 ===== Pb with SSP =====
+http://gibsonnet.net/blog/cgaix/html/vios_ssp_wont_start.html
 Remove cluster:
@@ Line 261: / Line 298: @@
 Then reboot
 ===== Where is store the config of SSP =====
 In the folder
   /var/vio/SSP/
+===== Convert a LU thick to thin in a SSP =====
+Use nslim ...
+https://www.ibm.com/support/pages/shared-storage-pools-hands-fun-virtual-disks-lu-example
+<code>
+$ ./nslim -?
+Usage: ./nslim (v4) is a filter style program using stdin & stdout
+        It will thinly write a file (only copy non-zero blocks)
+        It uses 1MB blocks
+        If a block is zero-filled then it is skipped using lseek()
+        If a block has data then it will write() the block unchanged
+Example:
+        ./nslim   <AIX.lu   >SSP-LU-name
+Flags:
+        -v for verbose output for every block you get a W=write or .=lseek on stderr
+        -V for verbose output on each GB you get count of written or skipped blocks
+                ./nslim -v   <AIX.lu   >SSP-LU-name
+                 this gives you visual feedback on progress
+        -t like verbose but does NOT actually write anything to stdout
+                 this lets you passively see the mix of used and unused blocks
+                ./nslim -t   <AIX.lu
+        -h or -? outputs this helpful message!
+Warning:
+         Get the redirection wrong and you will destroy your LU data
+</code>
+===== Removing Shared Storage Pool (SSP) Node From SSP Cluster With Mappings =====
+https://www.ibm.com/support/pages/removing-shared-storage-pool-ssp-node-ssp-cluster-mappings
+===== Node Types (roles) In Shared Storage Pool Cluster =====
+In a SSP cluster, some nodes perform key roles handled in certain layers. These layers are classified as:
+  * Cluster Aware AIX (CAA)
+  * Database (DBN)
+  * Message Format Service (MFS)
+=== How to determine current CAA LEADER node ===
+<cli prompt='#'>
+$ oem_setup_env
+# pooladm dump node | grep -i leader
+            whichever one returns "amILeader=1" is the leader node.
+</cli>
+=== How to determine current MFS node ===
+<cli prompt='#'>
+$ oem_setup_env
+# pooladm pool lsmfs /var/vio/SSP/[CLUSTER_NAME]/D_E_F_A_U_L_T_061310
+</cli>
+=== How to determine DBN node ===
+<cli prompt='$'>
+$ cluster -status -verbose | grep -p DBN
+</cli>

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