I was involved in an interesting case recently. It was interesting because the customer was running an 8 node cluster, 4 disk groups per host and 5 x ~900GB hard disks per disk group which should have provided somewhere in the region of 150TB of storage capacity (with a little overhead for metadata). But after some maintenance tasks, the customer was seeing only 100TB approximately on the VSAN datastore.
This was a little strange since the VSAN status in the vSphere web client was showing all 160 disks claimed by VSAN, yet the capacity of the VSAN datastore did not reflect this. So what could cause this behaviour?
Pretty soon I’ll be heading out on the road to talk at various VMUGs about our first 6 months with VSAN, VMware’s Virtual SAN product. Regular readers will need no introduction to VSAN, and as was mentioned at VMworld this year, we’re gearing up for our next major release. With that in mind, I thought it might be useful to go back over the last 6 months, with a look at some successes, some design decisions you might have to make, what are the available troubleshooting tools, some common gotchas (all those things that will help you have a successful Proof of Concept – POC – with VSAN) and then a quick view at some futures.
Whilst at VMworld 2014, I had the opportunity to catch up with the Nexenta team who have been working on a very interesting project with VMware’s Virtual SAN (VSAN). The Nexenta Connect for VSAN product, running on top of VSAN, is designed to provide file services, which allows VSAN to not only store your virtual machines, but also to provide SMB and NFS shares for those virtual machines. I caught up with Michael Letschin and Gijsbert Janssen van Doorn of the Nexenta team to learn more and get a tech preview of the product.
There was a very interesting discussion on our internal forums here at VMware over the past week. One of our guys had built out a VSAN cluster, and everything looked good. However on attempting to deploy a virtual machine on the VSAN datastore, he kept hitting an error which reported that it “cannot complete file creation operation”. As I said, everything looked healthy. The cluster formed correctly, there were no network partitions and the network status was normal. So what could be the problem?
Maxta are another storage vendor that I managed to get talking to at this years’ VMworld conference in San Francisco. Although they were present at last year’s VMworld, they only announced themselves in earnest last November (11/12/13) with the release of the Maxta Storage Platform (MxSP). I spent some time with Kiran Sreenivasamurthy, Director of PM & PMM at Maxta, and he was very open in sharing details on the Maxta product.
If you read the blurb on Maxta on the VMworld sponsor/exhibitor list, it states that they eliminate the need for storage arrays, provide enterprise class data services and has full virtualization integration from UI to data management.
So on the face of it, Maxta is another converged solution, similar in many respects to VMware’s own Virtual SAN, Nutanix, Simplivity, etc. So what makes Maxta so different? Kiran shared his views with me here.
I have been doing a bunch of stuff around disaster recovery (DR) recently, and my storage of choice at both the production site and the recovery site has been VSAN, VMware Virtual SAN. I have already done a number of tests already with products like vCenter Server, vCenter Operations Manager and NSX, our network virtualization product. Next up was VCO, our vCenter Orchestrator product. I set up vSphere Replication for my vCO servers (I deployed them in a HA configuration) and their associated SQL DB VM on Friday, but when I got in Monday morning, I could not log onto my vCenter. The problem was that my vCenter was running on VSAN (a bit of a chicken and egg type situation), so how do I troubleshoot this situation without my vCenter. And what was the actual problem? Was it a VSAN issue? This is what had to be done to resolve it.
Yesterday was my first day at VMworld 2014. As usual with this event, there are simply so many interesting announcements that it is hard to keep track. However, for me, there were a few things which stood out in the storage space worth calling out. These are specifically VMware focused products and features. I know that many of our partners have also made announcements in the storage space, but for today I concentrated solely on VMware. There are the two that really caught my attention.