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Storage & Clustering Community Blog
Showing posts tagged with Dynamic Multi-Pathing and Dynamic Multi-Pathing for VMware
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TonyGriffiths | 01 Feb 2013 | 0 comments

Veritas Storage Foundation and High Availability Solutions (SFHA) 6.0.3 is now available

For AIX , Solaris, Red Hat Enterprise Linux, SUSE Linux and HP-UX

SORT links are below:

Use SORT notifications to receive updates on new patches and documentation.






Release type

Patch name

Release date


Veritas Storage Foundation HA 6.0.1

Maintenance Release



c3lsius | 04 Jan 2013 | 0 comments

It has been a busy end of 2012 indeed. Last November and December, a few of my colleagues and I represented the Storage and Availability Management team at the back-to-back NetApp Insight conferences in Las Vegas, Dublin and Macau. At this technically-oriented conference,we promoted our latest product partnership with NetApp, specifically for:

(1) Dynamic Multi-Pathing for VMware (vDMP)- provides performance, availability and visibility for block-attached storage for VMware ESX.

(2) Symantec Data Insight- helps customers improve data governance through data owner identification and visibility into data usage and access permissions.

Through conversations with NetApp's partners and product management employees from around the world, it is evident that there is a big opportunity for vDMP and Data Insight integrated with NetApp storage systems.

Besides from discussions about recent product launches at NetApp and key partnerships formed, some keynote...

Hari Krishna Vemuri | 28 Nov 2012 | 0 comments

When using the VxDMP vSphere UI plugin, the vSphere administrator can quickly figure out the purpose of various VxDMP parameters, what the values represent, and how various operations can be performed using the online context sensitive documentation that is available along with the vCenter UI plugin.

The administrator can click the Help icon (?) on any of the VxDMP vSphere UI views and the information pertaining to the view is automatically presented in a popup window for quick reference.

The documentation is organized in form of chapters similar to the administration guide that comes with the product to help in quick reference. It  also allows keyword and index based searches.

I would like to hear back about your thoughts and experiences with using context sensitive documentation and would...

Hari Krishna Vemuri | 28 Nov 2012 | 0 comments

The standard administration of a VMware vSphere environment is typically performed using the vSphere client UI, but some of the advanced functionality and automation can only be done using custom scripts that use the remote command line interfaces.

The VxDMP command-line packages can be obtained from the installation media or downloaded from VxDMP UI as shown below

VxDMP for VMware follows this philosophy and provides the familiar and widely-used cross-platform administration command line interfaces for the VMware ESX environment as well. The VxDMP commands can be executed from any Linux or Windows host that has the VxDMP command line administration package installed on it.

The command line interface has also been enhanced for VMware environments to allow execution of a command...

Hari Krishna Vemuri | 28 Nov 2012 | 0 comments

With the sizes of data centers ever increasing, it has become a challenge to monitor the settings on the large number of servers in the environment and make them consistent so that compliance needs are met. Also, when new servers are provisioned in the environment, it’s a challenge to tune them according to the constraints of the operating environment.

VxDMP helps to reduce this burden on the vSphere infrastructure administrator by providing a bird’s eye view of the data center compliance under “Solutions and Applications” category under the ‘Home’ view of the vSphere UI client showing

  • Percentage and number of ESX hosts licensed with VxDMP,
  • Percentage and number of ESX hosts using VxDMP without a license
  • Percentage and number of ESX hosts which have not deployed VxDMP.


Hari Krishna Vemuri | 28 Nov 2012 | 0 comments

In large data centers, whenever the storage administrator requires to perform maintenance operations on a SAN infrastructure component, it’s difficult to identify all the entities in the data center are currently using it. Typically, the storage administrator needs to run various set of inquiries and provide list of transport identifiers (WWN mappings, iSCSI target IDs) that would be affected by the maintenance operation to the vSphere administrator who then, in turn, needs to search through the environment to identify the set of affected ESX hosts and the running virtual machines. This process is time consuming, tiring and error prone.  Additionally due to the dynamic nature of VMware, the configuration information can change very quickly; the location of a virtual machine may be different than it was mere minutes ago.

VxDMP helps ease this painful process by providing visibility into the vSphere entities that are currently using a given...

Hari Krishna Vemuri | 28 Nov 2012 | 0 comments

In storage infrastructures, the I/O bottlenecks and resultant loss in performance are typically seen at the interconnection points where multiple sources of I/O traffic meet, such as HBAs on the host, the storage array controller, storage array ports etc. In VMware vSphere environments, the solution that is currently available for such I/O bottleneck problems is to move the data to another storage array. However this data movement is time consuming and cannot be used for frequent changes in I/O traffic landscape.

Since VxDMP can establish the relationship between the LUNs and the transport (HBA to storage array port) links being used for the I/O traffic (across multiple hosts), it provides visibility to the vSphere administrator regarding usage of a particular shared storage component (HBA, Storage array controller, storage array port, etc). Therefore VxDMP enables the virtual infrastructure administrator to make sure all...

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 interface.


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 multiple proactive error...