Around the Storage Block Blog : SAS

Why isn't all storage in a SAN?

CalvinZ — Mon, 01 Jun 2009 16:09:00 GMT

By Charles Vallhonrat

Despite many years of strong growth in storage migrating to SANs, we still live in a world where a huge amount of storage is still directly attached to servers. Why have we not seen all storage move external for any environment with multiple servers? Surely the SAN offers lower cost, higher data protection, and better utilization.

The fact of the matter is a lot of data remains inside servers or directly attached via a JBOD because that is the best place for it. Maybe there is a specific performance need, or certain local control of data and access that leads to customers keep storage directly attached. Customers are savvy and until the SAN offers a better solution for their specific need, they are keeping certain storage infrastructure close to the server.

Enter shared SAS. It looks and smells like shared storage yet offers the simplicity of Direct Attached Storage (DAS) and has no requirement for a switch or to manage a network in smaller configurations. HP introduced a shared SAS solution - The MSA2000sa - in August 2008 and quickly SAS became 25% of the interconnect mix for MSA. Now with the release of a generation 2 model (or G2) there are a number of improvements that will likely boost usage still further. The G2 products is faster than the previous generation, supports more drives, supports more snapshots, supports more LUNs, supports more servers...and on and on. But, one of the most important new features is support for 2.5" inch (aka Small Form Factor) drives. Yep, the same type of drives used in many ProLiant servers. In fact, with the MSA2000sa G2, the small form factor drives are same drives that are used in our HP ProLiant servers. Talk about keeping the simplicity of DAS...

By the way, once customers get the benefit of shared storage using SAS, the MSA architecture allows them to upgrade controllers to iSCSI or Fibre Channel if they wish. Maybe we have finally found the catalyst to remove storage from servers.

Tweet this!

6Gbps SAS drives

CalvinZ — Wed, 15 Apr 2009 17:52:00 GMT

By Calvin Zito

Sonia Mathur, my colleague on the HP ProLiant team, has a post titled "Are 6Gbps SAS drives right for your environment?". Here's a link to her post: http://www.communities.hp.com/online/blogs/reality-check-server-insights/archive/2009/04/13/are-6gbps-sas-drives-right-for-your-environment.aspx. I think you'll find this very helpful. You can also check out our StorageWorks Product Selector to see which of our StorageWorks disk systems support SAS drives. Go to the product selector (URL: http://h18006.www1.hp.com/storage/productselector/index_disk-cframe.html) and under drive info, select SAS. In future posts, we'll talk about support for 6Gbs SAS drives on our storage systems.

Is the SAN dead?

CalvinZ — Wed, 10 Dec 2008 22:08:00 GMT

By Lee Johns

Is the SAN Dead?

Well what do you know. A well respected analyst has had the courage to write a paper entitled "Do you really need a SAN anymore?". In his paper Andrew Reichman of Forrester postulates that the promise of the SAN has not been realised and that application centric storage based on industry standard platforms and alternate interconnects like iSCSI, SAS and infiniband may offer a better return.

So is the SAN dead. The simple answer is no. Fibre Channel SANs will continue to be the predominant platforms for storage over the next few years. However there is real merit in Andrew Reichman's hypothesis.

I am a Zoologist. Yes I admit it. I have an "ology". I don't apply the knowledge I gained from zoology everyday in my job in the computer industry but occasionally I do and one of the things that zoology taught me is that evolution comes in leaps. When the climate changes dramatically it does not suddenly result in mutations that lead the next generations. Those mutations already exist, and the change in climate just means their adaptions (which may previously have been a weakness) make them more competitive than they were.

We are currently going through one of these "Climate Changes" with the turmoil in the financial markets. IT managers are looking for alternatives and they are out there. The HP Oracle Exadata Database Machine (Leverages infiniband), The HP Extreme Data Storage System (SAS), alternate SAN technologies like LeftHand Networks an HP company (iSCSI) and new SAS connected solutions including HP's direct connect storage for HP BladeSystem.

Anyone want to make a guess as to who is most ready to capitalize on this new shift in storage power? Andrew Reichman makes some suggestions and HP is on his list of the best prepared and most likely to embrace. He does not say it quite like a Zoologist would however. As every zoolologist knows The Dinosaurs never saw that meteorite coming.

If you liked this article you might also like the read the following (these are all links):-

And for those of you who don't believe I'm a zoologist:-

http://h30431.www3.hp.com/?fr_story=48087e34d302151d43a00ab35c025f555c2d375c&rf=bm

New small form factor drives coming soon to HP server and storage systems

CalvinZ — Fri, 05 Dec 2008 23:37:00 GMT

By Calvin Zito

Earlier this week, HP announced new 2.5" small form factor (SFF) 300GB SAS drives. You can read a bit about them in a blog written by my colleague Sonia Mathur on the ProLiant server team. Here's the link to her post: http://www.communities.hp.com/online/blogs/reality-check-server-insights/archive/2008/12/02/small-form-factor-drive-storage-doubles.aspx. We'll leverage the SFF drives in several of our StorageWorks products like the MSA, storage blades, and the All-in-One Storage blade.

You might also be interested in an article written on SearchStorage.com about the drives: http://searchstorage.techtarget.com/news/article/0,289142,sid5_gci1341037,00.html

Have a good weekend!

HP BladeSystem and StorageWorks Synergy

CalvinZ — Mon, 17 Nov 2008 18:26:00 GMT

By Lee Johns

I often get asked why HP BladeSystem and StorageWorks are such a compelling combination. There are multiple reasons and it starts with the cost of connecting to existing fibre channel storage which can be reduced by up to 50% with the reductions in cables, single failure points and administration when you use a technology like HP Virtual Connect. You of course also benefit from the infrastructure savings you get from implementing blade servers in terms of time, energy, change and cost.

Today there is a new reason. Direct connect storage! Think the simplicity of DAS with the resource sharing of a SAN. With HP BladeSystem you can now implement up to 192TB of shared storage across 16 blade servers using a simple, but high-performance 3Gb SAS interconnect. What's more the Storage offers all the management features and capabilities of the HP MSA 2000 but without the requirement to manage a fabric (Fibre Channel or iSCSI).

Now don't get me wrong. Fibre Channel and iSCSI storage are every bit as important as they were yesterday with BladeSystem. In fact HP also announced a technology called Virtual Connect Flex-10 for BladeSystems today that will offer great benefits for future iSCSI storage solutions for our EVA and MSA as well as future products from our acquisition of LeftHand Networks. The difference today is that if implementing Fibre Channel or iSCSI was not the right choice for me as a customer, I now have an alternative that offers breakthrough simplicity. Direct connect storage is perfect for Server Administrators who want to implement a simple shared storage environment for boot infrastructure or other server administrator controlled data. It is ideal for small and medium businesses or remote sites who are looking to implement there first SAN but want a simpler solution. It is great for VMware infrastructure and supports VMotion. It is great second tier storage for Enterprises.

Customer excitement in HP early previews has been very strong. In fact it has so much utility for new implementations or existing SAN environments it make me wonder why the traditional storage only vendors are not offering it. After all it simply offers customers more choice.

Lee Johns, Director of Marketing for Entry Storage

NPI Day

CalvinZ — Mon, 17 Nov 2008 16:32:00 GMT

No, it's not the Norwegian Polar Institute Day or No Pun Intended Day - it's our new product introduction day. NPI at StorageWorks is an internal process to have our products available for customers and channel. We focus on areas like services, internal configuration tools and systems, supply chain readiness, pricing, and marketing (e.g. hp.com page, brochures, photography, and other marketing content). Our NPI's generally have somewhere between 20 to 30 products. Each NPI is generally a mix of updates to an existing products and brand new products. Here are a few highlights of today's new product introduction:

Overview page of today's NPI: http://h18006.www1.hp.com/storage/highlights/11172008.html. Here you'll see links to all of the products, solutions, and services that are either new or updated today.
One of the significant parts of today's NPI is the new 3Gb SAS switch. This was included in a BladeSystem press release today. Here's a link to the press release: HP Launches Breakthrough Virtualization Technologies That Cut Networking Costs by 55 Percent. There's a good blog post on ZDNet by James Staten from Forrester Research talking about the Flex-10 Virtual Connect module coming from our BladeSystem team. Don't expect to see innovation like this from storage-only vendors like EMC. Here's a link to the SAS switch product page: HP StorageWorks 3Gb SAS BL Switch.
My list is getting long so I'll highlight one more: the HP StorageWorks 9100 Extreme Data Storage System that we've discussed many times here. I'm really excited about leveraging a 3-dimensional interactive demo (that we have used at trade shows) on hp.com. This is pretty cool stuff that allows you to "play" with the ExDS9100. If you don't look at anything else, you have to check this out: ExDS9100 3-d interactive tour. You can check out other ExDS9100 info at www.hp.com/go/ExtremeStorage.

There are some other enhancements in today's NPI that I'll point to in part 2 later today.

Top Ten Reasons Why DAS Will Grow!

jasontreu — Tue, 26 Aug 2008 18:17:00 GMT

By Lee Johns

For a number of years now the relentless growth of SANs has overshadowed the Direct Attached Storage market (DAS). Indeed market studies have shown that while still a large market, DAS is shrinking. However, recent advances in SAS drives and SAS connectivity, along with market shifts are pointing to a resurgence of DAS.

I thought I might put forward 10 reasons why over the next 18 months DAS will grow! SO HERE WE GO (drum roll)...

1) SAS connectivity offers much more functionality that older SCSI cable connections. Indeed major systems manufacturers, like HP, have introduced SAS connected arrays that can provided a shared storage environment for multiple servers just like a SAN. For smaller environments this offers SAN functionality without the headache of managing a network.

2) Server Blades are the hotest growth area of the server market. By consolidating servers in a single enclosure, SAS based arrays will in the near future be able to share storage across more servers without using a network with traditional server architectures.

3) Server Virtualization is the hotest SW growth story in the market. Using products like VMware forces customers to have to consider how to implement shared storage, and for many using fibre channel storage is too expensive. SAS connectivity offers a lower cost alternative and is easier to manage, especially for server administrators. SAS products like the HP MSA 2000sa are VMware certified.

4) Although SAN's have consolidated a huge amount of data there still exists an extraordinary amount of drives in servers today that have not been consolidated for a variety of reasons. SAS offers a lower cost consolidation play for the drives that have not today been moved to SANs.

5) Ongoing management costs are one of the major issues faced by IT organizations today. If you don't already have a Fibre Channel SAN and just require shared storage for a few simple applications why look at managing a new fabric and hiring expensive SAN administrators?

6) Applications like Microsoft Exchange are moving more and more storage services inside the application. They are even recomending DAS for performance.

7) Web 2.0 companies are having to think differently about storage implementations b/c of new scale out applications. They can not afford traditional SAN's and the promise of architecting Storage based on DAS is compelling.

8) Server purchasers can not buy SANs without engaging Storage teams. They can buy shared SAS storage though and get the same effect.

9) Choice is always important as a consumer. Products like the HP MSA 2000 offers the choice of Fibre Channel, iSCSI or SAS interconnect, while providing the same basic functionality and management interface. This means you can buy into SAS connected storage with a simple migration path to a future SAN based on iSCSI or Fibre, if you need the future scalability.

10) AND FINALLY......... COST, COST, COST. It is an easy way for SMB's to implement shared storage and have you seen the economy lately?!?

What do you think?

Storage Just got SASsy! VMware set free of the SAN.

jasontreu — Tue, 22 Jul 2008 02:24:00 GMT

By Lee Johns, director of marketing, StorageWorks Entry Storage and Storage Blades, HP

Serial Attached SCSI (SAS). Does not sound very exciting really does it? Many of you will know SAS as a class of disk drives found in servers and arrays but how many have ever though of using SAS as an interconnect for storage instead of Fibre Channel or iSCSI? Probably not many and with good reason. SAS is a point to point protocal that can not compete today with the sophistication of network storage toploogies like Fibre Channel and iSCSI for Enterprise Arrays.

But what if you just want to deliver a simple solution for shared boot, or a VMware infrastructure that enables Vmotion without a SAN, or you have an application that performs best with a direct attached storage architecture but you want better storage utilization. Now the cost and complexity of a SAN seems somewhat redundant. Why is there no way to provide the performance you need with the consolidation and utilization of a SAN without the overhead of an expensive fibre channel network infrastructure or leaving things as they are with existing direct attached storage (DAS)?

There is an answer. It is using SAS as a shared storage interconnect and with it you can build much simpler shared storage environments that can be managed by a server administrator. This saves you time, money and enables you to build the best architecture for any application. It is not a replacement for the traditional SAN but it is an enhancement to DAS that places the data and control where it should be and does not force fit a SAN as the answer to all storage problems.

Shared SAS solutions are available today and I encourage you to think where they could help you improve your Direct Attached Storage architectures and augment the SAN. SAS began as an internal server interconnect so maybe it is no surprise that dedicated storage vendors like EMC and NetApp are ignoring SAS as an interconnect. They feel it is threatening to them and that is exactly why you should be taking a serious look!