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02-09-2014, 02:52 PM
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An excellent article from the EuroVPS blog.

Quote:
Ask the Tough Questions. It’s your Data!

Posted by Vasili on Wed, September 04, 2013 at 12:40

Many vendors during these times are providing ‘cloud systems’ with PC based SANs. Although these are sometimes great solutions, they should be kept in small business environments, as 99.9% of these systems are not fully (A/B) fault tolerant and cannot withstand a complete service processor outage. Do you maintain a realtime ‘copy’ of live data on a secondary SAN? (99.9% of providers will not pass this question.)
  • Can your SAN survive a complete storage processor / controller failure?
  • Can your SAN survive a complete disk shelf failure?
  • Can your SAN survive a complete power failure?
  • Can your SAN survive a complete HBA failure? (Many software SANs now, use PCI-e HBA’s - these fail)
  • Do you use 7.2K disks in your SAN?
  • Do you use SSD’s in your SAN? What type of SSD? (Any MLC SSD is dangerous i.e. data loss, when used in a nonstop storage platform)
  • How does your SAN’s backend connect to the hypervisors? (Anything other than Infiniband, 10Gigabit Ethernet, or Fibre Channel is unacceptable in the year 2013 - and this includes trunked Gigabit Ethernet)
When considering a cloud provider, we may suggest that you ask them the tough questions - these are the ones that will inevitably decide whether during some ‘act of God’, you lose your data forever - or not. A proper SAN configuration will always be 100.00% available, but it will cost significantly more than a “Basic” SAN. It’s very simple to see this in action, simply notice the “recommended hardware configurations” published by some cloud orchestration products these days, and subsequently used by ‘Cloud Hosting’ providers. The purpose of the below questions, is to determine whether or not your potential cloud hosting providers, really has what it takes to guarantee your data’s integrity now and into the future. They should be able to provide you with a clear topology of how your server’s disks will be during normal operation, failover action, and where the backups will be.

At EuroVPS, your cloud server will be based on EMC’s legendary Fibre Channel SAN technologies. We currently own and operate several, very large EMC FC SANs within our organization, and each and every one of these SAN’s is fully fault tolerant. This means that each SAN has two “sides”, we call them the A and B side. Each side can operate fully independently of the other, even if power drops completely, if one side is completely failed, if cabling is faulted, if anything happens to either side, the opposite side will continue to operate without any interruption. LUN’s can move from one service processor to another without any interruption in service, and considering that each of our hypervisors has dual redundant paths to the SANs - this is clearly a far superior solution than most competitor’s “SAN in a box” offering.

Further complementing our reliable storage offering, is the fact that as of Q3 2013, all Virtual Machine data (ALL) is replicated in real time to a dedicated SAN, which is tasked with only one job - maintain 2nd copies of all virtual machine data in realtime, with zero delay. This means quite simply, that your Virtual Machine, while it’s running and you’re serving websites - at that time unknown to you and totally invisibly, it’s disk is being replicated with EMC’s “MirrorView” to a completely different Storage System (SAN) - one way, 24/7/365. The benefits of such a SAN mirroring solution are obvious. EuroVPS provides this SAN mirroring to you, free of charge.

EuroVPS’s core values have always ensured that customer data integrity is our top priority.
https://www.eurovps.com/blog/post/as...-its-your-data

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Someday, 12:01 PM
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03-23-2016, 10:08 AM
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Few more:
1. Do they provide Horizontal scaling. (If someone wants to upgrade their plan).
2. What cache technologies they provide ?
3. For CMS's, what special optimizations they provide.

And the list goes on
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03-27-2016, 02:03 AM
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kpmedia kpmedia is offline
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Had you not been a completely useless asshole spammer waste-of-humanity...

... then I'd have said to ask them for current 2016 details, seeing as how this was a 2014 post.

But, for the record:
1. They do have upgrade paths.
2. Different plans have different kinds of caching, as any good host should.
3. It's generally your job to optimize a CMS, not the host. They do have special WordPress hosting, however.

The list doesn't go on.

Anybody wanting to post new question should do so, not bump something from years past.

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