Re: [load balancing] LVS

From: Ian Rae <irae [izzat] syntenic.com>
Date: Thu Aug 02 2007 - 16:03:59 EDT

I assume that Kemp is an LVS based appliance where they have worked
through the hard parts of the installation/configuration and kept the
costs low, obviously the downside is that it would be less customizable.
Has anyone tried/tested the Kemp load balancers?

Ian

On Thu, 02 Aug 2007 12:38:01 -0400, Tony Bourke <tony@vegan.net> wrote:

> Using LVS is certainly roll-your-own, which has it's advantages and
> disadvantages. Setting up the redundancy, etc. (and getting it right)
> is a pretty tall order, but if you've got the skill set and you're
> comfortable with the limitations, more power to you.
>
> However, modern PCs are plenty capable of handling modern traffic
> needs. There was a time when ASIC-based hardware load balancers had a
> tremendous edge over PCs in performance, but Moore's law has boosted the
> capacity of PCs so that they can handle hundred of megs per second, even
> gigs (with the right bus). Plus, given most load balancers these days
> do L7/cookie persistence/etc. (LVS does not), that type of traffic has
> to be handled by a general processor anyway (unless someone has
> developed a L7 ASIC, which I don't believe exists, certainly not in the
> last Foundry I worked on). When you get into really crazy amounts of
> traffic, then something other than a PC is needed, but that's an
> entirely different market segment.
>
> While LVS doesn't do cookies, there is an open source project (HAProxy?)
> that works with cookie persistence now.
>
> LVS is more of a value market product anyway, whereas Foundry is a
> Premium market product. Even if the potential LVS user went with a
> commercial product, that company/user isn't likely to spend the cash for
> a Foundry/F5/Citrix/etc.
>
> As far as hard drives go, they're making their way back into network
> devices nowadays. WAN optimization devices all use disks now to cache
> and pre-fetch content, and a whole host of other technologies are making
> hard drives for network devices necessary.
>
> Tony
>
> Oliver Adam wrote:
>> I would be careful with LVS in a productive environment - I like open
>> source projects but L4-7 switching is quite a complex area and you
>> want to have someone supporting you in case of a problem.
>> Professional Application Switches are much easier to configure and
>> they have a bigger feature set - persistency based on cookies is for
>> example something which is quite often necessary but not available in
>> LVS if I am not wrong.
>>
>> LVS is based on a normal PC at the end - I tend to ask: do you really
>> want to load balance PCs with PCs? The LVS box is going to do all on
>> a few processors (amount depends on your hardware) and I have seen
>> problems on nearly every hardware and various OSs already where the
>> CPU was somehow suddenly bloody busy and the device not longer
>> reachable. Hardware AppSwitches (most of them) do not have this
>> problem because they have dedicated mgmt processors and so on. On top
>> of that I hate HDDs in networking components doing important jobs...
>> harddrives tend to have problems after some time.
>>
>> It is your decision and I do not want to stop anybody from doing what
>> he wants. Nevertheless I wanted to mention that - LVS is most
>> probably nice in case you do not need more and in case support is not
>> really a question and it is more the price your are thinking about.
>>
>> Regards,
>>
>> Oliver Adam
>> System Engineer L4/7, Germany
>> Foundry Networks
>>
>> Become a believer: http://www.foundrynet.com/believer/
>> Application Switching: http://www.foundrynet.com/products/app-switch/
>>
>>
>> At 18:12 01.08.2007, you wrote:
>>
>>> >From LVS wiki (http://kb.linuxvirtualserver.org/wiki/FAQ):
>>>
>>> "The ultimate performance of LVS depends on hardware that LVS runs on.
>>> An ordinary box with a single Pentium III processor and 100Mbps NIC
>>> card
>>> running LVS/DR can handle about 10,000 connections per second for web
>>> service. We have heard that a powerful box with good hardware and
>>> kernel
>>> tuning achieved 50,000 connections per second."
>>>
>>> That said, remember that LVS is a hodgepodge of various open source
>>> projects (VAnessa(UltraMonkey, Super Sparrow (GLB)) Linux HA Heartbeat
>>> package, Mon, Piranha, keepalived, net-snmp-lvs-module, IPVS, KTCPVS),
>>> some active and some not so active. So I'd advise you to exercise
>>> prudence if you're considering doing an enterprise implementation of
>>> LVS.
>>>
>>> -Tal
>>>
>>> ---
>>> Tal M. Klein
>>> Technical Marketing & Strategy
>>> NetScaler & WanScaler Team
>>> Application Networking Group
>>> Citrix Systems, Inc.
>>>
>>>
>>> -----Original Message-----
>>> From: lb-l-bounces@vegan.net [mailto:lb-l-bounces@vegan.net] On Behalf
>>> Of Cristian Rojas
>>> Sent: Wednesday, August 01, 2007 2:10 AM
>>> To: lb-l@vegan.net
>>> Subject: [load balancing] LVS
>>>
>>> Hi people, anyone has any experience with LVS and has
>>> any benchmark against the known commercial products?
>>>
>>> Thanks
>>>
>>> Cristian
>>>
>>>
>>>
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>>
>>
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-- 
Ian Rae
Syntenic Inc.
514-944-4008
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Received on Thu Aug 2 16:04:55 2007

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