Yellow Bricks

by Duncan Epping

pernixdata

Startup News Flash part 1

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I am on PTO this week so have tried to avoid spending time behind my mac/iPhone/iPad, well tried I guess… It is difficult as most of you probably know and have realized. While on vacation a couple of interesting things happened, hence this Startup New Flash blog post. The primary focus of this article is Startup news / Flash-related news. Preferably in the storage/flash space. This can be flash caching, flash arrays, hybrid arrays, flash drives… you name it! I guess “new technologies from old companies” would even fit. Will try to make this a regular thing… Or at least use the same title when there is something flashy announced or worth calling out.

For those who have been living under a rock the last week, besides introducing a brand new logo, PernixData announced general availability of FVP 1.0. On Monday my RSS reader was filled with Pernix related articles, and I was almost at the point of muting “Pernix” on twitter. So why the excitement, what did they announce? Hopefully, most of you have read my article on Pernix, or have been following Frank’s series of articles. I guess everyone is aware that Pernix offers a hypervisor-based flash virtualization platform. Meaning that their solution is installed as a “vib” within ESXi, indeed not an appliance-based approach. But others are doing this as well, so what is so unique about it? Write-back caching… Clustered write-back caching that is, so guaranteeing consistency of your IO. In other words, when within FVP you enable “write-back” caching, you can select how many relicas of the IO you want. (Currently, it ranges from 0 to 2.) Pricing for the enterprise solution was also announced, $ 7500,- per host. The announcement mentions there will be a different SKU for SMB, so looking forward to hear the details on that. One thing which I didn’t know is that Pernix also has optimization for View environments, it contains a form of “dedupe” for the base images… Frank revealed this on the APAC podcast (episode 77) he was on, hosted by Mike Laverick. (Recommend listening to it.) All in all an exciting and unique 1.0 release… I guess you might wonder where I think they should focus on, for me that would be NFS support and potentially support for other hypervisors, but if I recall correctly Satyam or Frank mentioned that those are being worked on.

Diablo announced Memory Channel Storage (MCS). The next logical step if you ask me when it comes to reducing latency and increasing bandwidth. MCS basically brings flash closer to your CPU by leveraging the memory bus instead of PCIe/SAS/SATA. Interesting concept, something worth exploring. Especially considering you can present it as either normal memory (how about TBs of memory for a fraction of the price?) or as a block device. This means that you could potentially use Diablo as a target for a flash caching solution. One of the benefits many people listed is that this solution would be very useful in blade environments or hyperconverged due to the fact that it eliminates the need for a PCIe slot or a disk slot… I guess that is somewhat true, in many of those cases the number of memory slots will also be limited so it doesn’t really solve those types of constraints immediately. Nevertheless, an interesting solution which is worth exploring and definitely offers new opportunities.

Another interesting announcement came from a startup called Crossbar. Crossbar came out of stealthmode this week, and is working on RRAM. With 20x faster write performance at 20x lower power consumption and much higher capacity density compared to best-of-breed flash solutions you can understand why people are excited about Crossbar. The market opportunity is huge here, and various companies have been working on it… So far not many have been able to execute on it at scale, so congrats to Crossbar, and definitely a company and a solution to keep your eye on. I know I will, I have already added them to my twitter startup watch list.

Hybrid, flash, converged storage, what’s next? Hybrid storage stack!?

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I saw a tweet pass by from PernixData and although I already knew the world of datacenter/storage design was changing it just really sank in. Over the last 5 years we have seen the world of storage change significantly. We have seen new types of storage being introduced like all-flash-based storage, hybrid storage (mix of SSD and SATA) and hyper-converged solutions. Examples of these would be Violin Memory (all-flash), Tintri (hybrid) and Nutanix (converged). More recently object-based storage solutions are trending, as Stephen Foskett states in his article on scaling storage it is nothing new but it seems to be more relevant in this new day and age.

I would expect Frank Denneman to dive in to the whole architecture aspect as part of his “Basic elements of a flash virtualization platform” series, so I am not going in to a huge amount of depth, but I did wanted to coin this term / strategy / direction. Host based flash caching solutions like VMware vFlash (when released), PernixData, FlashSoft and others will allow you to decouple performance from capacity. It truly should be treated as a new tier of storage, an extension of your storage system! This is something which will take time to realize… as it is natural to see host based flash caching solution as an extension of your hypervisor. I have been struggling with this myself for a while to be honest. When you realize that host based flash caching is a new storage tier you will also wonder what would sit behind that new storage tier? In an existing environment it is clear what the next tier is, but in a green field deployment which components should be part of a hybrid storage stack?

Just to clarify, “hybrid” in “hybrid storage stack” refers to the usage of flash for performance requirements and spindles for capacity whereas “stack” refers to the fact that this solution is not contained with in a single box as opposed to a hybrid storage device. So the first component obviously would be host based flash caching, this would enable you to meet your performance requirements. Now, I will aim to keep things simple but there are various host based data services like replication which could be included if needed. From a capacity perspective a storage system would be needed, something that can easily scale out and is easy to manage. Object-based storage solutions are trending for a reason, and I think they could be a good fit. No need for me to explain why, when Stephen has already done that in his excellent article, lets just quote the relevant portion:

This is exactly the architecture that the latest storage arrays are adopting: Object storage inside, with loosely-coupled nodes offering truly dynamic scaling. Although many allow native API access, most of these products also include an integrated object-to-file gateway, with VMware-friendly NFS or Windows-oriented SMB as the front-end protocol. These aren’t the ideal protocols for scaly-storage access, but at least they’re compatible with existing applications.

By finally divorcing data storage from legacy RAID, these systems offer compelling advantages. Many include integrated tiering, with big, slow disks and flash storage acting in concert.

Now here comes the problem I see… These object storage solutions today are not designed to work in-conjunction with host local flash caching solutions. Not that I would expect it to cause issues from a technical perspective, but fit might cause issues from a total cost of ownership perspective. What I am saying is that many of these systems are already “optimized” for both performance and capacity. So what would be next? Smart object based storage solution that integrates with host local flash caching solutions and can easily scale out for a fair price? I haven’t seen too many (which doesn’t mean there aren’t any), it seems there is an opportunity here.

Maybe a call-to-action for all those vendors working on host based flash caching solutions… It would be nice to see reference architectures for existing environments with legacy storage, but also for green-field deployments. What if I have a brand new datacenter, where does your platform fit? How do I control cost by decoupling performance and capacity? What are good options for capacity? How well do these solutions interact / integrate? I know, a lot of questions and not a lot of answers for now… hopefully that will change.

Introducing startup PernixData – Out of stealth!

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There are many startups out there that do something with storage these days. To be honest, many of them do the same thing and at times I wonder why on earth everyone focuses on the same segment and tries to attack it with the same product / feature set. One of the golden rules for any startup should be that you have a unique solution that will sell itself. Yes I realize that it is difficult, but if you want to succeed you will need to stand out.

About a year ago Satyam Vaghani (former VMware principal engineer who was responsible for VMFS, VAAI, VVOLs etc.) and Poojan Kumar (former VMware Data products lead and ex-Oracle Exadata founder) decided to start a company – PernixData. PernixData was conceptualized based on their experiences working on the intersection of virtualization, flash based storage and data. Today PernixData is revealed to the world. For those who don’t know, Pernix means “agile”. But what is PernixData about?

How many of you haven’t experienced storage performance problems? It probably is, in fact, the number one bottleneck in most virtualized environments. Convincing your manager (director / VP) that you need a new ultra-fast (and expensive) storage device is not easy; far from it. On top of that, data will always hit the network first before being acknowledged and every read will go over your storage network. How cool would it be if there was a seamless software solution that solves all your storage performance problems without you requiring to rip and replace your existing storage assets?

Server-side flash overcomes problems associated with network based storage and server-side caching solutions provide some respite. Yet, server-side caching solutions usually neither satisfy enterprise class requirements for availability nor transparently support clustered hypervisor features such as VMware vMotion. In addition, while they accelerate reads they fail to do much for writes. Customers are then stuck between either overhauling their entire storage infrastructure or going with caching solutions that work for limited use cases. PernixData is about to release a cool new product – a flash virtualization platform – that bridges this gap. By picking up where hypervisors left off, PernixData is planning to become the VMware of server flash and is aiming to do to server flash what VMware did to CPU and memory. So, what is this flash virtualization platform and why would you need it?

PernixData’s flash virtualization platform virtualizes all flash resources across all server nodes in a vCenter Server cluster into a single high-performance, enterprise class data tier. The great thing is that this happens in a transparent way. PernixData sits completely within the hypervisor and in the data-path of your virtual machine. Note that there are no requirements to install anything in the guest (virtual machine). PernixData is not a virtual appliance because virtual appliances introduce performance overhead and would need to be managed with all costs and complexity associated.

PernixData is also flash technology agnostic. It can leverage SSD or PCIe flash (or both) within the platform. The nice thing is that PernixData uses a scale-out architecture. As you add hosts with flash they can be dynamically added to the platform. On top of that, PernixData does both read and write acceleration while providing full data protection and is fully compatible with VM mobility solutions like vMotion, Storage vMotion, HA, DRS and Storage DRS.

Even more exciting PernixData will support both Write-through and Write-back modes. The cool part is that PernixData also ensures IO is replicated for high availability purposes. You don’t want to run your VM in Write-back mode when you cannot guaranteed data is highly available right?! I guess that is one of the unique selling points of the solution. A distributed, scale out, flash virtualization platform which is not only flash agnostic but also non-disruptive for your virtual workloads.

I would imagine this is many times cheaper than buying a new storage array. Even without knowing what the cost of PernixData will be, or which flash device (PCIe or SSD) you would decide to use… I bet when it comes to overall costs of the solution (product + implementation costs) it will be many many times cheaper.

As I started off with, the golden rule for any startup should be that they have a unique solution that sells itself. I am confident that PernixData FVP has just that by being a disruptive technology that solves a big problem in virtualized environments  in a scale-out and transparent manner while leveraging your existing storage investments.

If you want to be kept up to date, make sure to follow Satyam, Poojan , Charlie and PernixData on twitter. If you are interested in joining the PernixData FVP Beta, make sure to sign up!

Make sure to also read Frank’s article on PernixData.

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I recommend watching the Storage Field Day videos for more details from Satyam Vaghani himself, note the playlist this is 4 videos!

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