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Storage & Clustering Community Blog

Showing posts in English
Hari Krishna Vemuri | 28 Nov 2012 | 0 comments

VxDMP provides a versatile edge during provisioning and monitoring of storage resources in the VMware vSphere environment. Being aware of storage array specifics and connectivity, VxDMP can uniquely identify and differentiate multiple storage array instances of the same type in the vSphere environment.



As can be seen in the above figure, the ESX host has two EMC Symmetrix storage arrays connected and VxDMP has identified them as two separate physical entities (and hence failure domains) and therefore named them as emc0 and emc1


VxDMP can further use it’s unique and patented LUN naming system to provide an auto-generated user friendly name for the LUNs from a storage array that is derived from a unique identifier of the LUN (known as Array Volume ID) when seen from the storage array management...

Hari Krishna Vemuri | 28 Nov 2012 | 0 comments

The multi-pathing policies are connectivity based and are therefore applicable to all the LUNs that are enclosed in the same physical entity, i.e. the instance of the storage array. Hence it makes sense to have these set on a per storage array instance basis and thus avoid the need for further configuration steps whenever new LUNs are added to an existing storage array and exposed to the same host


VxDMP understands the specific array using storage array specific policy modules and employs the best algorithm suited for providing access to LUNs from the array. The policies are pre-configured (out of the box) based on the array characteristics and hence does not require any user configuration. The administrator can just plug-in the array and start using it.


However if the administrator chooses, they can override the defaults for the storage array and these settings are persistent. VxDMP offers a choice of multiple I/O policies, as well as...

Hari Krishna Vemuri | 28 Nov 2012 | 0 comments

I am sure a lot of people have this question occur to them. Well here I would like to put across some of the reasons why I think you should opt for VxDMP in your VMware virtualized environment. Please let me know if you find more…. smiley


VxDMP brings the proven enterprise class multi-pathing functionality to VMware ESX environments. It provides greater availability, reliability, and performance using advanced path failover and load balancing algorithms for a wide range of storage arrays. Read more ...


VxDMP integrates with VMware vSphere infrastructure and provides a deeper insight into the storage connected to an...

Zahid.Haseeb | 25 Nov 2012 | 0 comments


- My Lab Environment

OS = rhel 6.2

SFHA = 6.0

- Introduction to SSMTP utility:

SSMTP is a program to deliver an email from a local computer to a configured mailhost (mailhub)/gmail. One of its primary uses is for forwarding automated email (like system alerts) off your machine and to an external email address.

- Installation:

#yum install ssmtp

- Configuration file:


- Configuration:

To configure SSMTP, you will have to edit its configuration file (/etc/ssmtp/ssmtp.conf) and enter your account settings:

# The user account that sends all the mails

# The mail server (where the mail is sent to), usually on port 587

# Use SSL/TLS before starting negotiation 

# Username/Password
AuthUser=username of gmail account
Doreet | 19 Nov 2012 | 0 comments

See how Veritas Cluster Server high availability and disaster recovery solutions enable enterprises to eliminate the risk of deploying business critical applications in virtual environments.


Read or about Veritas Cluster Server at:
anishv | 08 Nov 2012 | 1 comment

We are seeing great adoption rate for our newest SFHA releases (6.0 & 6.0.1) and customer escalation data shows a marked improvement in quality over previous release (5.1SP1). In the last year (Nov 2011-Oct 2012), deployments of 5.1SP1 and 6.0/6.0.1 releases were equal in number whereas the customer escalations received on 6.0/6.0.1 stream were just 40% as compared to those received on 5.1SP1. And the good news doesn’t stop there! It is common that an escalation does not actually end up in product code changes and the trend continues, significantly smaller number of customer escalations on 6.0/6.0.1 stream resulted in product changes as compared to previous release.

Doreet | 08 Nov 2012 | 0 comments

Hosting some 1.3 billion website visits each month, LivePerson understands how to scale big. The CSO for the largest provider of realtime customer engagement solutions explains how the firm is leveraging Veritas Cluster Server to meet business-critical requirements around cloud services availability and deliver on its SLAs for customers.


Pooja Sarda | 02 Nov 2012 | 1 comment


The VCS DiskGroup agent has a configurable option PanicSystemOnDGLoss. It enables fast failover of application on loss of storage connectivity or when disk group commands are not responding. On extremely busy systems, it can cause halting of the system due to consecutive monitor timeouts. Prior to VCS 5.1, it was set to on (1) by default. Based on feedback, we changed the default from on (1) to off (0). However, we could still only turn on/off the behavior. With VCS 6.0, we have added flexibility to set it to a value based on the use case.

0: Do not halt the system.

1: Halt the system if either disk group goes into disabled state or the disk group resource faults due to monitor timeout.

2: Halt the system if disk group goes into disabled state.

3: Halt the system if disk group resource faults due to monitor timeout.

Priya 2 | 02 Nov 2012 | 0 comments

Before installing any Oracle RAC patch or patchset software:

■ Review the latest information on supported Oracle RAC patches and patchsets:

To apply Oracle patches

1 Freeze the service group that contains the Oracle resource and the cssd
       # hagrp -freeze grp_name

2 Install the patches or patchsets required for your Oracle RAC installation.
     See the Oracle documentation that accompanies the patch or patchset.
If the patch is for Oracle database software, after applying the patch, before
starting the database or database instance, relink the SF Oracle RAC libraries
with Oracle libraries.

3 Unfreeze the service group that contains the Oracle resource and the cssd

Pooja Sarda | 02 Nov 2012 | 0 comments

Would you like to simplify management and high availability of LPARs (AIX logical partitions) and application running inside it? Are you moving to the private cloud?

Try our ApplicationHA for LPARs and make your application in the LPAR and the LPAR itself highly available. You can achieve this with Veritas Cluster Server in just one LPAR per physical server and light weight ApplicationHA in rest of the LPARs.

The ApplicationHA LPARs will auto-register, auto-restart and auto-failover! And that‘s not all. We support across platforms - VMWare, Solaris LDOMs and Linux KVM. More information can be found at