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Citrix XenServer Enterprise Edition 4.1:Administration












Citrix XenServer Enterprise Edition 4.1:Administration real questions
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In-depth Q&A with Citrix about the latest and future XenClient

Citrix released edition 1.0 of their client hypervisor, referred to as "XenClient," two weeks in the past. I wrote a fairly poor article about it, actually asserting that whereas I adored the idea of XenClient, I did not suppose like the 1.0 unencumber become competent, and therefore it turned into relatively worthless for now.

Then closing week I attended Citrix Synergy Berlin. numerous Citrix personnel got here as much as me to let me recognize they had read my article. Reactions were split, with some agreeing with me by feeling the product may still nevertheless be categorised as a beta, and others in fact pondering i used to be an idiotic blow-tough who hadn't even used the product. (For the checklist i used to be part of the XenClient beta application, and i spent quite a lot of time with it before forming my opinion.)

one of the good things that got here from the article is that two key individuals from Citrix offered to take a seat down with me at Synergy and have a no-holds-barred conversation about XenClient. I fortunately agreed!

I first sat down with Peter Blum, the lead product manager for XenClient. That was adopted the next day with the aid of a conversation with Ian Pratt, co-creator of the Xen hypervisor and co-founder of XenSource. So needless to say, these are the appropriate guys to be talking to!

I requested each of them lots of questions, and that i furiously typed notes as they spoke. state-of-the-art article is fully according to my conversations with them. I organized the content material by field, first addressing the concerns I raised in my Oct 4 article, and then going into the other questions I requested.

Is XenClient 1.0 able to be a real product, or is it nonetheless "beta" best?

modern information is that it be a v1.0 product, so that they're expecting it to be used for pilots and proofs of concept. If somebody came to them and noted, "I need to installation 10k seats," they'd say no. but lots of people are doing it on their personal. And there are precise customers with possibly 100 or 200 endpoints that thoroughly plan on deploying 1.0 to all their clients.

That noted, Citrix expects the next XenClient free up (targeted for the primary half of next 12 months) to be the one that individuals in fact delivery to make use of, after which 2012 might be the volume yr.

This maturity cycle is whatever thing that all products go through... definitely they saw the exact identical issue with XenServer.

What about all the "wide-spread issues?"

well firstly, XenClient is free, and so they wish to be totally open about the issues. lots of these issues do not happen that commonly. in case you look at View four, there are over 80 similar "well-known considerations." They believe XenClient is ready average there. but once more, this XenClient is 1.0, and any product goes to have a long listing of concerns.

They truly brought up that they're in a troublesome place. if they do not divulge the concerns then americans will accuse them of hiding stuff and customers will waste time troubleshooting and calling guide for stuff they already know about. but when they do disclose the concerns then they get bloggers pointing them out to the area. (touche!)

however they consider that this 1.0 unencumber will basically be used through IT professionals, and once again, it be free and lots of the time-honored concerns have workarounds. And in a number of extra releases this won't be a problem.

What concerning the "experimental" features?

There are lots of good strong facets in the product that are not experimental. building a shopper hypervisor is difficult work, and they're very pleased with what's in there and supported.

As for the specifics, the utility sharing is experimental because you can not share apps out of a VM that has the 3D pass through, so for that to be a full-on function then it needs to be solid and the UI has to make experience.

As for 3D aid, in reality they now feel that that is now full production satisfactory, however they weren't in a position to internally sign-off on that until too late, so the documentation and the product officially say that 3D is experimental.

Why is vPro required?

XenClient 1.0 doesn't require vPro--it's simply "particularly informed." truly it comes right down to the chipset. truly what they want is VTX and VTD, and any system with vPro instantly has these. however definitely there may be lots of hardware available devoid of vPro that does have VTX and VTD, and assuming those systems have Intel images & BIOS (as opposed to EFI), then XenClient should work exceptional.

And to be clear, Ian without delay observed, "nobody's paid us now not to make use of vPro." (closing month I implied that XenClient requiring vPro turned into because of Intel paying Citrix, in place of any technical purpose. Ian made it very clear that this become no longer the case.) in the future, there might be non-vPro contraptions on the HCL.

Why the "small" hardware compatibility record (HCL) ?

The HCL now has 23 programs, which is double the measurement from the beta testing. however extra importantly, those 23 different fashions characterize 15 million gadgets in the world. They went to the OEMs and asked, "What are your highest volume programs?" there is a massive bell curve for the numbers and fashions of laptops that these carriers sell. They took the two optimum ones from each and every supplier, plus the little executive laptops. And the chances are pretty good that clients will have one among them.

And again, here is only a delivery. inside a yr or year-and-a-half, this issue will kind of repair itself.

The best enviornment on the HCL the place they've basically taken some flack is on the GPU. (XenClient 1.0 is barely supported on programs with Intel GPUs.) They didn't take into account that the early adopters are IT pro folks who need XenClient for themselves and definitely have greater powerful GPUs. Of course Citrix demoed XenClient.subsequent on the leading stage at Synergy in Berlin working on an Nvidia GPU gadget, so this is coming as soon as possible.

however all this conversation is simply round what's formally supported. XenClient works fine on reasonably somewhat greater stuff, it be simply that Citrix failed to have the bandwidth to really go throughout the entire certification technique. however there's a lot of stuff accessible this is now not on the HCL that works high-quality.

Citrix is additionally working with the OEMs to get all of the "little" aspects working, like the special hardware buttons. To get help for stuff like that, they deserve to work with the providers. (in the event you're questioning, occasionally it be in fact handy to get the buttons to work--they are just a daily keyscan code. other instances particular button presses make WMI calls to the BIOS, and Citrix has to leverage a prevalent mechanism for remoting returned within the BIOS.

On lack of TxT & TPM support

despite the fact that all this expertise (like TxT) has been in Intel consumers for awhile, there is nonetheless no colossal use of TxT today. Intel continually makes bound the hardware works, but from the BIOS enablement factor of view, if there's no actual application to check, then the OEMs often ship laptops and pcs with broken BIOS that can't competently interface with TxT. Citrix saw this and realized it's going to be tough to make TxT work at this aspect, (and really they discovered a number of activities the place the BIOS tables on methods with vPro have been just plain wrong)!

So the shortcoming of assist of TxT on some dealer platforms, and the interplay between TxT and TPM are not neatly demonstrated becasue there's nothing to examine towards--actually some older BIOS revisions would even brick the machines when TxT become enabled.

Then there are additionally some logistical concerns to kind out. TxT combined with sleep mode of a computing device is in fact complicated. What occurs during this case is that TxT will assess the equipment for those who sleep, after which once again when wake up to ensure that every little thing is as you left, and then use the TPM to seal it. but all the way through the boot-up method, the BIOS runs earlier than the hypervisor and the VM, so when the BIOS changes things, TxT resets and your state is long gone. So XenClient doesn't even get an opportunity to work with TxT.

The good information moving forward is now that Citrix has a far better relationship with the OEMs, they can tackle this. however's crucial to understand that they are on the bleeding edge of TxT and TPM and VT-D and that these concerns will get solved fairly straight away.

Relationship with OEMs

one of the crucial problems Citrix had with the early XenClient checking out and hardware certification was that they were kind of on their own when it got here to hardware for testing. firstly Citrix had to go out and actually purchase a bunch of Dell and HP techniques for development, trying out, and QA.

but their OEM relationships are evolving. Now they are since instead of them going out to the OEMs, the OEMs are truly sending them new techniques for checking out. basically some of the stuff Citrix is getting are dev types of techniques which are many months out--they are literally a bunch of circuit boards in a styrofoam box. This potential that as a substitute of Citrix chasing the OEMs after the truth, they're definitely a part of the design technique.

one of the crucial bulletins from Synergy remaining week turned into that a number of Lenovo contraptions were now supported for XenClient 1.0. if so Lenovo truly came to them looking to get their stuff licensed, so Citrix is already seeing the fruit of a few of their momentum right here.

in the end Citrix wants to work with as many OEMs as possible to construct and deploy customer hypervisors. Any know-how they boost will be shared freely by means of open supply (other than just a few portraits components they should offer protection to) with different OEMs, and eventually these OEMs may create new products that even compete towards Citrix's offerings, which is okay.

Disk photograph portability

modern-day XenClient disk photographs are one hundred% hardware unbiased. in the future or not it's truly handiest the GPU driver that would should be selected to a definite actual GPU. Citrix envisions that they'd simply overbuild the drivers within the VM. truly the main challenges are booting and networking--as long as you can do these, then every thing else is easy. And booting and networking on consumers is relatively effortless. (No SAN drivers, SCSI, RAID controllers, and so forth.) The true key is only to steer clear of a Blue reveal for "boot equipment no longer discovered," however again it is no longer a problem for laptops.

I requested if Citrix would create distinct VHDs that were layered dynamically to separate out the hardware-specific components from the OS. They have been very clear of their reply to this: no. "If they have now performed that, we've failed," Ian stated.

Xen's Paravirtualization architecture abstracts the mannequin for the contraptions. Citrix's plan is to come up with abstract models for distinctive GPUs. So these days they could do this with Intel, so a single set of paravirtualization GPU drivers could work for a variety of Intel GPUs, but they can not use that to make an Intel GPU appear to be an ATI or Nvidia GPU. however because these GPUs don't seem to be boot gadgets, which you can at all times fall returned to a standard portraits driver.

And with the fashion to put more and more on the CPU, Citrix's job in fact receives less demanding as time goes on. developing anything like XenClient would were an awful lot harder a couple of years in the past due to the fact that contemporary hardware is tons more homogenous.

Of course you nonetheless want native drivers for USB devices that are linked to the host and shared by means of USB flow-via.

Why is the XenClient "dynamic photograph mode" performance distinct than Citrix Provisioning Server?

XenClient's dynamic picture mode is similar in some easy methods to Provisioning Server (PVS), and in reality there are lots of crossover technologies. but there are additionally some key modifications.

The leading factor is that PVS requires a LAN connection to the boot quantity which is on a NAS. In XenClient, the boot extent is native.

I requested whether or not they'd ever guide PVS. Citrix stated that PVS works excellent with XenClient these days as long as it meets the PVS necessities (particularly a persistent LAN connection), but that after it comes to offline disks, more often than not like XenClient and XenDesktop / PVS will collectively evolve in order that the same disk photograph may also be used for each.

Citrix is additionally considering about the a considerable number of "layering" technologies required to lay down a completely personalized user ambiance on correct of a shared grasp graphic (regardless of even if that is handled with the aid of PVS or XenClient dynamic photographs). whether it really is some form of app virtualization, consumer Profile supervisor, or some thing they haven't viewed yet, the concept is equivalent.

Why should still americans use XenClient 1.0?

There are a couple of factors to make use of the 1.0 edition of XenClient. First is the whole enterprise & personal VMs on the same device. Citrix is definitely seeing this with cellular users where businesses are looking to get far from giving their clients native admin rights. XenClient lets them lock down their business pcs while nonetheless giving users the flexibleness to do whatever thing they desire with their very own photos.

security is an additional big play, not only for the disk encryption, faraway kill tablet, and low assault surface of a kind 1 hypervisor, but also in executive situations the place a single users wants assorted desktops that every connect to networks at diverse security classification ranges.

A closing purpose americans are the use of XenClient--and this came as a surprise to Citrix--is for an "improve" of VMware computer or virtual container. here's particularly for the early adopter IT pros, however the feeling is a kind 1 hypervisor operating natively on a device can supply a much better experience than VMs operating in windows.

Why is XenClient a sort 1 hypervisor? Will Citrix create a sort 2?

Citrix considered building a kind 2 version of Xen at one element, but ultimately they decided the market simply wasn't there. For XenClient, category 1 simply "feels" more suitable, for lag, performance, and many others.

Citrix's answer to type 2 is XenApp streamed apps plus XenVault. it's their pitch for BYOC & contractors today.

class 1 is essential because the IT department controls it. In a type 2 environment, the base layer will also be very own, which potential clients may delete it, installation malware, spyware, and so on. no longer so with a kind 1 hypervisor it is managed through IT.

How neatly does the Synchronizer work?

The Synchronizer is a server-aspect element it's accountable for deploying and backing up XenClient disk photographs. (And really or not it's the Synchronizer that have to be licensed if it's used to manage more than ten gadgets. XenClient itself is free.)

today the Synchronizer backs up techniques by using asking the customer hypervisor to take a standard VHD image on a schedule. The photo file begins out empty but then grows with the adjustments that are made. this is the file it's periodically backed up, so in case you should restore your photo you could locate the fashioned master plus the chain of delta backups.

nowadays the Synchronizer backs up every little thing. Citrix is engaged on technology they are calling "VHD Compact" which punches out web page data and deleted information to keep the backup snapshots as small as feasible, however that functionality wants more trying out so it hasn't been became on for XenClient 1.0.

despite the fact that 1.0 backs up everything, it does nevertheless compress the snapshots before they're ship across the community.

What about Neocleus?

Intel purchased customer hypervisor maker Neocleus remaining month. What does this mean for Citrix and XenClient?

Neocleus turned into going out of company, and what Intel bought became a bunch of gadget utility guys in Israel who truly know their stuff. These sorts of guys are challenging to return by, and if Citrix had a bunch in Israel then they'd have picked them up. however universal this deal has not affected Citrix's relationship with Intel.

What about digital computer?

or not it's been almost two years because Citrix invested in digital desktop, another startup within the customer hypervisor area. Citrix's top of the line intention (and explanation for investing in virtual computer) is to develop the market. the rest that gets extra Xen out there is good for Citrix.

in the case of digital computer, they're going after a unique use case by way of focusing on SMBs and existing hardware instruments. in spite of the fact that they share the identical core (Xen), virtual computer has executed a lot of respectable work and they're pleased with what they've completed.

Citrix has the luxury of looking ahead and working with the core hardware facets which are developing in new platforms like Sandy Bridge and Huron River whereas startups like virtual computing device are focusing on the existing installation base since they must promote items today. however this means that both are complementary. Citrix will do neatly within the enterprise area while others will do well in the verticals.

in the long run companies like virtual laptop may additionally even adopt the XenClient platform however with their own administration stack.

What edition of the Xen hypervisor is in XenClient?

XenClient 1.0 is in response to the equal hypervisor because the "Cowley" version of XenServer could be released as Citrix XenServer 5.6 feature Park 1. The handiest difference is in the configuration (for issues like energy administration) that may be different on the customer versus the server. XenClient also makes use of distinctive Xen security modules.

one of the most things it's enjoyable about the customer stuff. is that XenServer has 50k+ consumers, so rolling out the rest new requires a crazy volume of testing. but on the client, they can be way more aggressive, which is why we're seeing one of the vital security modules enabled first within the customer hypervisor so one can they finally make their approach into XenServer.

What about AMD?

All of Citrix's XenClient messaging is focused round Intel as a result of they're the dominent commercial enterprise desktop platform. right now AMD appears to be a little extra client-focused. as an example,  there isn't a IO MMU (which is like Intel's VTD) in AMD's client platform.

but from a technical standpoint there is nothing basically stopping XenClient 1.0 from operating on an AMD gadget. XenServer has supported AMD for years.

What in regards to the Mac?

First, there's no technical motive Citrix cannot make XenClient run on a Mac and enable the Mac OS X to be run in a guest VM. (although the Mac has EFI as an alternative of BIOS, the Xen hypervisor can address that and actually the open source version of Xen has assist for EFI.)

The greater situation is that Citrix wouldn't offer XenClient on the Mac with out Apple's full support, even with what the Mac OS X EULA says. The good information is that Citrix now has a relationship with Apple in keeping with the Receiver for iOS, so should still the Mac platform ever become a priority for them, as a minimum they have got somebody in Cupertino they could call.


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