Nutanix Node Running Low On Storage

I manage a few Nutanix clusters and they are all flash, because of this the normal tiering of data does not apply. In a hybrid mode, which has both spinning and solid state drives, the SSD will be used for read and write cache. Only moving “cold” data down to the slower spinning drives as needed.   The other day one of the nodes local drives were running out of free space.  It made me wonder what happens if they do fill up?

With Nutanix it tries keeps everything local to the node.  This provides low latency reads since there is no network for data to cross, but the writes still have to go across the network.  The reason for this is that you want at least two copies of data.  One local and one remote.  So when writes happen, it writes synchronously to the local and a remote node.  Writes are written across all nodes in the cluster, and in the event of a lost node it can use all nodes to rebuild that data.

When the drives do fill up nothing really happens.  Everything keeps working and their is no down time.  The local drives become read only.  Writes will then be written to at least two different nodes ensuring data redundancy.

To check the current utilization of your drives it is under Hardware > Table > Disk

Capture

So it is best practice to try to “right size” your workloads.  Try to  make sure that the VM’s will have their storage needs met by the local drives.  HCI is a great technology it just has a few different caveats to consider when designing for your workloads.

If you want a deeper dive about it check out Josh Odgers post about it.

Delegate For Storage Field Day 13

SFD-Logo-150x150

I am very excited to say that I have been chosen as a delegate for Storage Field Day 13 in Denver, Colorado June 14-16. Storage Field Day is just one of the many events of the Tech Field Day program. Tech Field Day brings in various vendors and leaders in tech to present on various topics. The delegates then can interact and ask all kinds of questions. I have been following the Tech Field Day program for a few years now. Ever since my good friend Michael Wood introduced it to me.

I first became interested in becoming a delegate after my friend Thom Greene was invited to join Tech Field Day.  Up to this point I had never met anyone who had been a part of it.  After talked to him it seemed like something I really would like to be a part of.  I know it is going to be an amazing  and humbling experience.  I am going to be with some of the smartest people in the industry.  Just take a look at the event page, and look at everyone that is going to be there.
As of now there is six presenters:

I already know a little about all of these companies, but I am eager to learn more. I am looking forward to the deep dives and white board sessions detailing all of the technology that they offer.

I will be following twitter so if you have anything you want me to find out, tweet at me @brandongraves08 I will try to ask as many questions as I can.  You can also follow #SFD13 to ask questions and keep up with event.

Blog at WordPress.com.

Up ↑