Category Archives: Storage array - Page 2

How to create a snapview snapshot on an existing LUN

I apologize in advance for this (6 years or so too late) post, since it’s for creating a snapview snapshot on a LUN on a VNX. It’s simply meant as a reminder for the command line syntax:

Examples for creating snapview snapshots (it only defines it, no COFW is happening at this point):
naviseccli -h snapview -createsnapshot 17 -snapshotname VMFS-001-SNAP
naviseccli -h snapview -createsnapshot 18 -snapshotname VMFS-003-SNAP
naviseccli -h snapview -createsnapshot 27 -snapshotname VMFS-002-SNAP
naviseccli -h snapview -createsnapshot 5 -snapshotname VMFS-004-SNAP

To start an actual point in time session (and the start of COFWs):
naviseccli -h [ip address] snapview -startsession [session name] -snapshotname VMFS-001-SNAP

To stop a session:
cnaviseccli -h [ip address] snapview -stopsession [session name]

To activate a snapview session (make the data visible):
naviseccli -h [ip address] snapview -activatesnapshot [session name] -snapshotname VMFS-001-SNAP

To deactivate a snapview session (stop presenting the data to the hosts):
naviseccli -h [ip address] snapview -deactivatesnapshot [session name] -snapshotname VMFS-001-SNAP

Dell EMC World 2016 Austin, TX, USA

Dell EMC World 2016

You’ve all heard the news last week (at least, I think you did): On September 7 the huge merger between Dell and EMC took place, making the Dell Technologies transaction the biggest technology company integration in history! So the digital transformation is really here, and Dell Technologies / Dell EMC is leading the way. From October 18 to 20, Dell EMC will host business and IT leaders from around the world for the biggest enterprise technology event of the year, Dell EMC World 2016 in Austin, Texas. And I received an invite to join the EMC Elect and Dell Rock Stars to report on the news that Michael Dell and others will bring us. Many thanks go to Mark Browne, who made sure EMC Elect people were invited to be present at this event. We’ll be in super secret influencer meetings, sneak peek preview breakfasts and we’ll be sitting in a reserved seat section to watch Michael Dell perform on stage! Yeah, I’m pretty excited! After being invited to the VNX2 launch in Milan in 2013, I’m once again present at a major event as part of the EMC Elect.

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Useful EMC VMAX CLI commands


Over the years I collected a number of useful CLI commands to control the DMX / VMAX machines I worked with. Even though nowadays Unisphere for VMAX is a useful tool, nothing really beats the command line!
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How to list Host LUN ids in VMAX Masking Views


Creating tdevs and masking them to hosts (storage groups in a masking view) is relatively easy in the Unisphere for VMAX interface, but what if you add a few tdevs of exactly the same size and you want to make sure that the VMware administrator uses the right LUN for each VMFS he’s going to create? One way to make sure he knows which LUN corresponds with what tdev is the Host LUN id. To list the host LUN ids

symaccess -sid 1234 show view mv_some-maskingview-name

or (a bit more verbose)

symaccess -sid 1234 list view -name mv_some-maskingview-name -detail

The second command shows each initiator group nested within other initiator groups as well.

Both generate a table with the following headers:

Sym                                                            Host
Dev     Dir:Port    Physical    Device    Name    Lun    Attr    Cap(MB)

The column under “Host Lun” shows the Host LUN ids.

Free EMC trial software / virtual appliances

virtual machine

A quick heads-up this time about building your own lab environment

Sometimes you just want to run a VNX, Avamar, PowerPath, Data Domain or Isilon as a virtual machine to see how things work, or to write work instructions. And EMC offers a lot of these virtual appliances for free!

Take a look at these: