Linked by Nik Tripp on Mon 2nd Mar 2009 21:40 UTC
SuSE, openSUSE IT solutions companies have been generating lots of buzz regarding thin clients basically since the early 1990s, but have yet to really penetrate into many suitable environments. These relatively cheap computer appliances carry broad promises like energy efficiency, space efficiency, and centralized maintenance and data storage. These claims could sound like the computer industry equivalent of snake oil. Kiwi-LTSP, a combination of KIWI imaging technology and Linux Terminal Server Project, is one open source solution for thin client servers.
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Kebabbert
Member since:
2007-07-27

Ok, we are missunderstanding each other. That is why I suspected you didnt know anything about thin clients.





What I call Ultra-Thin-Client, you call a Dumb-Terminal. Lets call them UTC for short. As far as I know, there is no vendor offering UTCs, other than SUN with SunRay. All vendor's thin clients are essentially a diskless weak PC with 1GHz CPU and 256MB RAM. Making them unusable for heavy work. SunRay is unique in that is a true UTC. It is a graphical variant of the dumb text terminals. But you can run Windows/Linux/Solaris with VMware and RDP on SunRay.





When I talk about one quad core driving 40 clients, I mean one quad core driving 40 UTCs. One user normally requires 1-2GB RAM and 1-2 GHz of CPU. It should be near impossible for one dual core and 4 GB RAM server to drive 30-40 UTCs. Therefore I doubted your claims (misunderstanding).

Of course a dual core and 4GB RAM server would suffice for 30 diskless PCs. That is no doubt, the server would almost act as a file server. Any OS would suffice for that task, even Windows. But I am talking about dumb terminals. There is no way a dual core and 4GB RAM server can drive 40 dumb terminals.

So I point out that a quad core can drive roughly 40 SunRays (i.e. dumb terminals). Of course you need lots of RAM for driving 40 SunRays. Each SunRay user needs 256-512 MB RAM on the server which is really good, considering how much memory the user would require if he used a dedicated PC instead.





Regarding thin client vs diskless PC. I consider them more or less, the same thing. Same, same but different. Both use a rather weak CPU and has little RAM. The diskless PC has slightly better stats, but the thin client has an OS to patch and maintain.As I mentioned, a HP thin client booted in 7 minutes, someone told me yesterday.

After a few years you have to upgrade the thin clients/diskless PCs, because they can not handle the new OS and new software versions. Worst case, you have to upgrade them all (very expensive), or worse, ditch all diskless PCs and buy new ones. With SunRay, you instead upgrade the server and at once all the SunRays have been upgraded. You can always use your SunRays, they never need to upgrade. Use them for 22 years, if you wish. They always handles the latest OS and newest software excellent. It is much cheaper to upgrade one server, than upgrade all diskless PCs. It is much cheaper to administer one quad core server, than to administer 40 diskless PCs. In the future, the servers will be dual octo core and have 128GB RAM, then the SunRays will be extremely fast. SunRay are future proof. Diskless PCs are not.

Diskless PCs also suck as much energy as a normal PC. Compare that to 4Watt SunRay. Say you have 1000 diskless PC each using 100 watt. That is 100,000Watt. With SunRay, that is 4000Watt.

You have no serious performance with diskless PC if you need to do say, a heavy compilation. With SunRay, you have as much power as the server has. A server will always be much much more powerful than a diskless PC or thin client. If you are alone on the server, then all it's powers is yours.

The only thing you can not do with SunRay, is high bandwidth graphics. You can watch movies at 500x500 windows without lagg. But that is graphic intense, compared to ordinary office usage and software development. For all other uses than watching movies, SunRay does it excellent. Many SunRay servers dont have any graphic card. The server generates bitmaps in RAM and sends to each SunRay. Each SunRay requires ~30KByte/sec for normal office usage.





They never break, average life expectancy is 22 years. SunRay is a small plastic box, very similar to a VHS cassette. It is just another keyboard or mouse, an input device. Can not be hacked. You can have dozens of them in a drawer. Should you need another work station, just insert SunRay into the router/hub and you are done. Anyone could do that.

Hot desking is also supported. Insert your security card and you have logged in. Then withdraw the card and insert it into another SunRay and you are back immediately where you left.

You can use SunRay over internet. One at work and one at home. You will login into your work environment.

If we speak about low end gear (as you do about diskless PC), you can find refurbished SunRay at 40 USD on Ebay. That is cheaper than a low end diskless PC. Never need upgrading too. A new one cost 200 USD. But they never break. Use them forever.

Here is an article about U.S Army switching to SunRay for their class rooms and saving lots of work and energy and money.
http://www.sun.com/customers/software/usaic.xml

There are Linux only solutions with SunRay. You dont have to use VMware and Windows XP. You can run everything as normal Linux users, creating normal Linux accounts, etc.

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