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  #1  
Old 10-14-2010, 06:36 PM
tumble tumble is offline
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Provider with best Read/Write setup


At this point in time I run and operate 3 servers. Two servers for customers and one server for support/billing and backups.
What’s important to me is read/write operations. I have some very busy forums that I host and I cannot degrade the performance for this customers. However from my looking around it does seem a few providers have a strong believe that a well created cloud will have no issues with read/write.

I am just looking into consolidating all my servers into some sort of cloud computing. I believe sometime in the future I would like to start to offer VPS as a service also.

My current specs viewed as single operating system.
16 cores
24Gig Ram
Raid10 8 sas drives usable storage 500G
Sata 1 drive usable storage 500G
2T bandwidth (tier 1 only)
Cost per month=532 USD

Looking thru providers.
I have talked with:
Storm on demand -> Bare Metal Servers? (not even sure why I was directed towards that app)
Rackspace -> Cloud->Vmare (just finished talking with them via phone)
CloudWeb ->Cloud-> OnAPP (waitng for call back)
Softlayer -> Cloud or Bare Metal
According to softlyer chat agent
Both public and private use a backend SAN solution for storage. This is what gives it the built in reduandcy and automated failover. Because of this read and write speeds are not as fast because the storage is not local.

So really is Cloud any good for Read/Write operations. And If so what is the best Provider for read/write type applications?

Thanks for for your thoughts and input.

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  #2  
Old 10-14-2010, 07:45 PM
Winky Winky is offline
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The fastest read/writes can be achieved using a Fibre Channel SAN with SSD drives in a RAID10 configuration. I know a provider that can deliver this for you. Would you mind if I PM'd you the name of the provider?

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  #3  
Old 10-14-2010, 07:55 PM
CloudWeb CloudWeb is offline
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Hello,

To put it simply, Cloud is a software implementation of existing technologies. The reason I say that is to show you that Cloud would not be at fault for poor IO in a given application, but simply a providers choice at their own implementation and offering of their Cloud services.

A Cloud can be built using any type or grade of hardware, which will have a varying degree of IO. So, if any system (Cloud or not) is using remote SANs you're going to have latency as well as other potential limitations or issues. Some SANs will do just fine, but it's always important to note how that particular provider is built.

In your case, you have stated that IO is a primary concern for your needs. Cost is also going to come into play as when a provider is using SANs (and they will need to be redundant, high available SANs) it's more than likely going to become more costly to provide you with more data than a Cloud infrastructure that is built on local storage. Not always though, just usually.

So ask your potential providers about their data infrastructure. If they're using SANs, it's also important to know how many servers/clients access it. It could be ultra fast one day, and then they continue to degrade in performance as they start with just two servers being connected and after a few months there's 20 using the same set of SANs, or other high IO customers.

From what I've seen in both neutral reviews from outside sources and my own research a Cloud built using local storage (local in the sense of drives on each server in the Cloud, not using external SANs but instead creating an IP SAN) has given the best results. But again, this also depends on the hardware used. You can build that out of ATA, SATA, SAS, SSD, etc just as a SAN. So local isn't always better than a SAN either. It's all about the details.

PS. We don't use OnApp, but do use AppLogic as one of our primary software platforms.

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  #4  
Old 10-14-2010, 09:36 PM
tumble tumble is offline
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I stand corrected CloudWeb does use AppLogic. And really it makes sense about the cloud being built woth local storage vs outside storage. As is stated by softlayer they directed me away form cloud to dedicated server.

Rackspace felt that there set up of external SAN's would have no issues whatsover with read/writes.

Storm in demand directed me to bare bone servers. And really I do not have the faintest idea how those corerespond to a cloud.


@winky sure shoot me a link
@Cloud Web (who uses AppLogic LOL) you are pretty high on my list.

Frank

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  #5  
Old 10-14-2010, 09:51 PM
brentpresley brentpresley is offline
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Applogic is one of the oldest and most robust of all cloud infrastructure companies. Other companies, not to step on any toes, are still playing catch-up to what they have already implemented.

I agree w/ CloudWeb 100% that your disk I/O is only limited by your SAN implementation, not by the cloud software itself.

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  #6  
Old 10-15-2010, 12:00 AM
SolarVPS SolarVPS is offline
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tumble,
You received bad information about a SAN being slower than local storage. A properly built SAN is going to blow local storage away in terms of disk I/O. In addition, it's not just how the SAN is built but how the entire network infrastructure was designed.

Some questions you should ask are:

1. Do you use multipathing on your front-end hypervisors?
2. Do you use SSD caching on your SAN? If so, do you have both READ and WRITE SSD caching?
3. Do you use SAS or SATA drives in your SAN?
4. How fast is your network bandwidth pipe between your hypervisors and your SAN?

Of course there are a lot more questions that you can and should ask, however, these are a few that all lend to how fast the disk I/O will be in your Virtual Machine. Their answers should be: 1) Yes 2) Yes and Yes 3) SAS and 4) at least 4 Gigs.

Good luck!

-Ross

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  #7  
Old 10-15-2010, 02:22 AM
nix101 nix101 is offline
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I would completely agree with SolarVPS,

Especially SSD caching will surely improve your SAN performance. SSD caching will also lower your overall SAN cost.

  #8  
Old 10-15-2010, 07:08 AM
ewitte ewitte is offline
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Interesting need to look into caching with SSD. I've been trying to do the whole array and it has been getting crazy expensive. Although not as much or even 1/10th as the out of the box solutions!

Its going to be hard for budget solutions because its either exteremely costly or takes an extreme amount of technical knowledge. I have been in the business for 15 years and am the Senior network engineer for on of Houston's top consulting firms and it is still a lot of work for me to figure out.

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  #9  
Old 10-15-2010, 07:57 AM
nix101 nix101 is offline
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http://www.adaptec.com/en-US/product...e-Performance/

This should give you an idea about SSD cache. Even with SATA hdds you can get great performance.

  #10  
Old 10-15-2010, 09:17 AM
ewitte ewitte is offline
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Do you think 20 500GB constellation drives in RAID10 and this setup with 4 32GB SLC drives would give good performance for up to 100 users?

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  #11  
Old 10-15-2010, 09:24 AM
cristibighea cristibighea is offline
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Quote:
Originally Posted by ewitte View Post
Do you think 20 500GB constellation drives in RAID10 and this setup with 4 32GB SLC drives would give good performance for up to 100 users?
I really doubt he needs that much space, and unless he's actually using a good chunk of the space provided by those 20 drives, he won't be seeing any performance benefit.

Perhaps some optimization on the software side of things might do wonders.

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  #12  
Old 10-15-2010, 09:58 AM
KansasHosting KansasHosting is offline
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I am giving infiniband/zfs a try for san, I was planning it out and found a guy doing almost the exact same with great success - zfsbuild.com

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  #13  
Old 10-15-2010, 10:01 AM
FHDave FHDave is offline
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Quote:
Originally Posted by Winky View Post
The fastest read/writes can be achieved using a Fibre Channel SAN with SSD drives in a RAID10 configuration. I know a provider that can deliver this for you. Would you mind if I PM'd you the name of the provider?
Why would Fibre Channel give any advantage of copper iSCSI? There is know 10 Gbps copper iSCSI per port, whereas Fibre Channel is only limited to 4 Gbps. Not to mention, Fibre Channel is much harder and more expensive to implement. It seems like technology for the past.

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  #14  
Old 10-15-2010, 10:36 AM
KansasHosting KansasHosting is offline
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Quote:
Originally Posted by FHDave View Post
Why would Fibre Channel give any advantage of copper iSCSI? There is know 10 Gbps copper iSCSI per port, whereas Fibre Channel is only limited to 4 Gbps. Not to mention, Fibre Channel is much harder and more expensive to implement. It seems like technology for the past.
Latency, Protocol Overhead

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  #15  
Old 10-15-2010, 10:51 AM
ewitte ewitte is offline
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I was looking at infiniband but I see something interesting from LSI. The SAS6160 SAS storage switch.

"24Gb/s SAS connections, aggregate bandwidth of 384Gb/s"

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