* * * READ ME * * *
            * * * Veritas Low Latency Transport 6.2.1 * * *
                         * * * Patch 600 * * *
                         Patch Date: 2016-11-28


This document provides the following information:

   * PATCH NAME
   * OPERATING SYSTEMS SUPPORTED BY THE PATCH
   * PACKAGES AFFECTED BY THE PATCH
   * BASE PRODUCT VERSIONS FOR THE PATCH
   * SUMMARY OF INCIDENTS FIXED BY THE PATCH
   * DETAILS OF INCIDENTS FIXED BY THE PATCH
   * INSTALLATION PRE-REQUISITES
   * INSTALLING THE PATCH
   * REMOVING THE PATCH


PATCH NAME
----------
Veritas Low Latency Transport 6.2.1 Patch 600


OPERATING SYSTEMS SUPPORTED BY THE PATCH
----------------------------------------
RHEL7 x86-64


PACKAGES AFFECTED BY THE PATCH
------------------------------
VRTSllt


BASE PRODUCT VERSIONS FOR THE PATCH
-----------------------------------
   * Symantec Cluster Server 6.2
   * Symantec Storage Foundation Cluster File System HA 6.2
   * Symantec Storage Foundation for Oracle RAC 6.2
   * Symantec Storage Foundation HA 6.2


SUMMARY OF INCIDENTS FIXED BY THE PATCH
---------------------------------------
Patch ID: 6.2.1.600
* 3905431 (3905430) Application IO hangs in case of FSS with LLT over RDMA during heavy data transfer.


DETAILS OF INCIDENTS FIXED BY THE PATCH
---------------------------------------
This patch fixes the following incidents:

Patch ID: 6.2.1.600

* 3905431 (Tracking ID: 3905430)

SYMPTOM:
Application IO hangs in case of FSS with LLT over RDMA during heavy data transfer.

DESCRIPTION:
In case of FSS using LLT over RDMA, sometimes IO may hang because of race conditions in LLT 
code.

RESOLUTION:
LLT module is modified to fix the race conditions arising due to heavy load with multiple 
application threads.



INSTALLING THE PATCH
--------------------
Run the Installer script to automatically install the patch:
-----------------------------------------------------------
Please be noted that the installation of this P-Patch will cause downtime.

To install the patch perform the following steps on at least one node in the cluster:
1. Copy the patch llt-rhel7_x86_64-Patch-6.2.1.600.tar.gz to /tmp
2. Untar llt-rhel7_x86_64-Patch-6.2.1.600.tar.gz to /tmp/hf
    # mkdir /tmp/hf
    # cd /tmp/hf
    # gunzip /tmp/llt-rhel7_x86_64-Patch-6.2.1.600.tar.gz
    # tar xf /tmp/llt-rhel7_x86_64-Patch-6.2.1.600.tar
3. Install the hotfix(Please be noted that the installation of this P-Patch will cause downtime.)
    # pwd /tmp/hf
    # ./installVRTSllt621P6 [<host1> <host2>...]

You can also install this patch together with 6.2.1 maintenance release using Install Bundles
1. Download this patch and extract it to a directory
2. Change to the Veritas InfoScale 6.2.1 directory and invoke the installmr script
   with -patch_path option where -patch_path should point to the patch directory
    # ./installmr -patch_path [<path to this patch>] [<host1> <host2>...]

Install the patch manually:
--------------------------
Perform the following steps on the node on which this patch is being applied:
1. Take backup of your configurations
2. Stop VCS
3. Install the patch
4. Restart VCS on the node

Stopping VCS on the cluster node
--------------------------------

1. Ensure that the "/opt/VRTSvcs/bin" directory is included in your PATH
   environment variable so that you can execute all the VCS commands. Refer 
   to Veritas Cluster Server Installation Guide for more information.

2. Freeze all the service groups persistently.
        # haconf -makerw
        # hagrp -freeze [group] -persistent

3. If the cluster is writable, you may close the configuration before stopping the cluster. 
    Stop the cluster on this node:
        # haconf -dump -makero

   run the following command:
        # hastop -local
    
   Verify that the cluster is stopped by running the ha command:
    # hasys -state

   make sure that both had and hashadow processes are stopped. Also, stop the VCS CmdServer:
    # CmdServer -stop

4. Stop the cluster services in order:
    - For AMF:
    # /etc/init.d/amf stop
    - For VxFEN:
    # /etc/init.d/vxfen stop
    - For GAB:
    # /etc/init.d/gab stop
    - For LLT
    # /etc/init.d/llt stop
    
Note: Stop any other services depending on GAB

Installing the Patch
--------------------

1. Un-compress the downloaded patch from Veritas and change the directory to the uncompressed patch location.
   Install the patch using the following command:

    # rpm -Uvh VRTSllt-6.2.1.600-RHEL7.x86_64.rpm

2. Run the following command to verify if the new patch has been installed:

    # rpm -q VRTSllt

   If the proper patch is installed, the following output is displayed:

    VRTSllt-6.2.1.600-RHEL7.x86_64

Re-starting the cluster services:
--------------------------------

1. To start the cluster services in order run the following command:
    - For LLT:
        # /etc/init.d/llt start
    - For GAB:
        # /etc/init.d/gab start
    - For VxFEN:
        # /etc/init.d/vxfen start
    - For AMF:
        # /etc/init.d/amf start
    - For VCS:
        # hastart
        # /opt/VRTSvcs/bin/CmdServer

2. Make VCS cluster writable:
         # haconf -makerw

3. Unfreeze all the groups:
         # hagrp -unfreeze [group] -persistent
         # haconf -dump -makero


REMOVING THE PATCH
------------------
Removal of the patch will result in removing the whole package from the system/node. To go back to a previous installed version of the package, you may need to re-install the package. Run the following steps on the node where the patch is being uninstalled:

To remove the patch from a cluster node:
---------------------------------------------
1. Freeze all the service groups persistently.
        # haconf -makerw
        # hagrp -freeze [group] -persistent

2. Stop VCS on the node by running the following command:
    - Follow the stop sequence as mentioned in the PATCH INSTALLATION section.

3. Remove the patch by using the following command:
    - For LLT:
        # rpm -e VRTSllt --nodeps

4. Verify that the patch has been removed from the system:
        - For LLT:
        # rpm -qa|grep VRTSllt

   Ensure that the package is not displayed. This confirms that the package is removed.

5. Install the relevant package from the VCS base media. 
    Also refer to SORT for any applicable patches.

6. To start the cluster service, run the following command first on one node:
    - Follow the start sequence as mentioned in the PATCH INSTALLATION section.

7. Unfreeze all the groups.
         # hagrp -unfreeze [group] -persistent
         # haconf -dump -makero


SPECIAL INSTRUCTIONS
--------------------
NONE


OTHERS
------
NONE