Killing the Business Desktop PC Softly
by Johan De Gelas on July 19, 2007 3:00 AM EST- Posted in
- IT Computing
Consolidated Client Infrastructure (CCI)
The blade chassis in which these blade PCs find a home is pretty simple. It consists of two redundant power supplies, a few redundant fans, and a BladeSystem switch.
Inside the PC blade chassis
The HP BladeSystem PC blade switch - which is the thin "drawer" beneath the fan module - is a Layer 2 switch that links up the 20 blade PCs (100 Mbit) to 4 Gbit Ethernet uplink ports. The goal is to have 2 ports of 1 Gbit/s uplink and a full failover to the other ports. You can also use the 4 fiber-optic Ethernet SFP slots if you buy the optional HP SX SFP Transceivers. Unfortunately using fiber optic networking also means that the copper Ethernet ports are disabled.
The blade switch is quite a capable switch supporting up to 256 virtual LANs, Spanning Tree Protocols, link aggregation, QoS, and trunking.
So now that we know what components are used, how does this all work? You could simply assign one thin PC to one blade PC, the static CCI model. But since moving over to CCI is all about lowering TCO, there is a better way to do it. A user logs into any thin client. The thin client connects and authenticates to an Active Directory server which works together with the Session Allocation Manager (SAM). SAM determines based on its database whether the user has a desktop session running or not. If so, SAM reconnects the user to the same session. If not, SAM establishes a session and connects the thin client to the appropriate blade PC and tells the blade PC where it can find the user documents, which are stored on the central storage server (NAS or SAN).
HP calls this the dynamic model of CCI. To make this work you need the following:
The blade chassis in which these blade PCs find a home is pretty simple. It consists of two redundant power supplies, a few redundant fans, and a BladeSystem switch.
Inside the PC blade chassis
The HP BladeSystem PC blade switch - which is the thin "drawer" beneath the fan module - is a Layer 2 switch that links up the 20 blade PCs (100 Mbit) to 4 Gbit Ethernet uplink ports. The goal is to have 2 ports of 1 Gbit/s uplink and a full failover to the other ports. You can also use the 4 fiber-optic Ethernet SFP slots if you buy the optional HP SX SFP Transceivers. Unfortunately using fiber optic networking also means that the copper Ethernet ports are disabled.
The blade switch is quite a capable switch supporting up to 256 virtual LANs, Spanning Tree Protocols, link aggregation, QoS, and trunking.
So now that we know what components are used, how does this all work? You could simply assign one thin PC to one blade PC, the static CCI model. But since moving over to CCI is all about lowering TCO, there is a better way to do it. A user logs into any thin client. The thin client connects and authenticates to an Active Directory server which works together with the Session Allocation Manager (SAM). SAM determines based on its database whether the user has a desktop session running or not. If so, SAM reconnects the user to the same session. If not, SAM establishes a session and connects the thin client to the appropriate blade PC and tells the blade PC where it can find the user documents, which are stored on the central storage server (NAS or SAN).
HP calls this the dynamic model of CCI. To make this work you need the following:
- As many thin PCs as users connected to an Ethernet LAN
- As many blade PCs as the maximum amount of concurrent users plus (at least) one (for fail over purposes) connected via the PC blade switch on the same Ethernet LAN
- One SAM and Active Directory server connected to the same LAN
- A Central storage server connected via FC, iSCSI (SAN) or LAN (NAS) to the SAM server
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Pale Rider - Thursday, July 19, 2007 - link
I work for a fortune 500 company as a sys admin. We have 10,000 nodes (PCs and servers).Half of those are desktop business PCs and we use PCs on purpose - they fullfill the business need the best.
The facst are, most applictions do not run correctly in a terminal server or think client enviroment. Until the software developers change this and the cost of this clients come down consideranly we have no plans to move to think clients - this is true for the majority of IT departments as well.
rowcroft - Thursday, July 19, 2007 - link
It's been out there for years, but I have deployed Sun's SunRay systems and they worked great. Granted, the environment had limited Windows requirements (ran Mozilla for web and e-mail, used custom apps for business use) but those were satisfied with a Citrix deployment.If you're looking for a stable, cost effective environment (both from a productivity and hard cost savings PoV) then you should consider something like that as well.
yacoub - Thursday, July 19, 2007 - link
I'd feel horrible for anyone working in that type of locked-down environment... no freedom, no ability to use software beyond what is installed by the default image (obviously I'm talking about winamp, AIM, and other useful items, not trojans or malware), all of your programs and processing power are at the mercy of whoever dictates how much your share of the server's horsepower you're allowed to consume and what software you have access to. Ugh. What a death sentence of a work environment.And for the IT department, what a dream come true! ;)
rowcroft - Thursday, July 19, 2007 - link
Problem is, who gets to determine what's OK and what isn't? Try managing that in an enterprise environment. This isn't meant for a shop with 200 computers and one admin.yacoub - Thursday, July 19, 2007 - link
Why the preview lure text for articles that is posted on the homepage below the article title always cuts off and yet the exact sentence never seems to be found in the actual article:nobody less than who? Please finish the sentence of the preview text on the homepage, instead of burying parts of it amongst several sentences later in the article.
strikeback03 - Thursday, July 19, 2007 - link
If you go to the "IT Computing" tab at the top of the page (or whatever section the article is in) you get the whole intro blurb. they just display a portion on the homepage.punko - Thursday, July 19, 2007 - link
As a heavy guy, I resent the term "fat client".The biggest improvement in cost of ownership lately has been the change to LCD monitors. The effect is real in power savings.
The biggest headache is the licensing model change by Microsoft, AutoDesk and Adobe. This may lead to a massive shift in software to open source alternatives.
In our firm, most have PC's with a large number of laptops. Thin clients can't replace laptops, and most of us with PC's tend to push them hard, so there isn't any advantage over PC's.
Chunga29 - Thursday, July 19, 2007 - link
Give me a break - take the PC (political correctness) somewhere else, please! If you're so offended, get off your duff and get some exercise, drop the fast food, don't drink sodas or juice or alcohol, and you'll be amazed at what that can do for your obesity.And yes, you probably are clinically obese, as are 65% (and rising) Americans. I was one of them until a year ago, when I kicked my ass into shape doing the above. Dropped from 240 pounds and 31% body fat down to 190 pounds and 16% body fat, where I have been happily resting for the past six months.
Or, you can be like so many others and blame the problem on genetics, your job, etc. because weight issues certainly can't be caused by personal behavior!
NT78stonewobble - Saturday, September 15, 2007 - link
I read it as a joke.Still I WOULD blame my doctor on gaining around 30 % body weight in one year when I was twelve by giving me hormones.
Hormones that in the end wouldn't have had any effect on me. Hormones would help eg. 60 % of cases and in the rest surgery was necessary. However the initial exam of everyone with this particular problem was cut due to costs and thus everyone was given one or even two halfyear treatsments of hormones instead.
So unless you really know the guy dont ditch him.
P.S. Yes I've lost the weight since then. I am however still suffering from depressions going on the 10 th year and have an allmost anorectic relationship to food.
JohanAnandtech - Thursday, July 19, 2007 - link
Thin portables do exist, and could be a reality once Wimax and/or 3G are ubiquitous.But I do agree that the licensing models of the bige Software guys add a lot to TCO. Is it just me or is IDC always trying minimize those by grossly overestimating administration costs? :-)