Demon Internet now offer SDSL with 1-1 contention, and 2 megabit upload and download.
Is it recommendable to use SDSL to host a major website from home, as long as the peaks in traffic are known to be less than 2 megabit.
I am thinking the advantages over colocation are:-
1) You can host your machines at home without any rack space to worry about
2) No worries about travelling to the data center in an emergency
3) No bullying over excess bandwidth possible. You have your 2 megabit, which if it cant handle it, your web users suffer, but you would not get a massive bandwidth over-quota charge at the end of the month. As long as you can keep bandwidth below the capacity peak, it would seem okay !? I appreciate that data centers are burstable to 10 megabit or even 100 megabit.
I see the following downsides but are there any others:-
(a) No UPS incase of power supply failures
(b) No backup lines - if the line goes, it goes, until it is back up again. It is analogous to a cheap leased line in effect.
(c) Bandwidth not burstable - but if your peak traffic is below the 2 megabit limit, this may not be an issue
Since Demon don't appear to list prices, I'm going to hazard that they are around £350+/month for this service. Which even at a relatively expensive colo provider you're going to get a couple of U + 2Mbit/s + APC Ports + Possibly KVMoIP as well. Then as you say, you have to factor in generally unreliable domestic electricity supplies (With no SLA as such), no backup lines - SDSL like any system provided over a normal phone line, isn't all that reliable, plus you've got to rely on many more layers of equipment than you would with a normal colo, or even a leased line (You've got RADIUS servers for a start).
I would think that if your site is small enough traffic wise to handle a max of 2mbit you should be fine you can easily UPS your own box from small brownouts, although most major outages usually rare dependant where you live, I dont think my power has gone out in years for mroe then 30sec.
Originally posted by wotanworks I think you'll notice considerable latency VS a T1 or being in a colo facility.
I think its safe to say that if you plan on using this for anything reasonable, you'll want colo...
Latency of a SDSL line is usually on par with T1 and not really that big a deal, in the 2-5ms range. I would suggest checking if g.shdsl is available over sdsl. Not only is the speed/distance better, the error correction on the shdsl standard is much better.
SDSL generally uses non-SLA copper such as LDDS or alarm/dry copper lines. Its generally a very afforadble option to T1 circuits. However the trade off is MTTR (Mean Time To Repair).
I generally recommend against SDSL unless the client has a specific reason not to Co-Locate (ie large data vault at office or specific reason)
We have had clients doing both and everyone has been happy with the choices they made. The key is to know the tradeoffs and how they will affect your particular company.
The thing which is currently very scarey for me, is that my colocation bandwidth graph has shot up by *3 which means that I will be over bandwidth this month by over 200 gig. This would mean on standard rates, paying about 400 pounds extra.
I have installed the well known MRTG and put the IP Address of the firewall using these instructions which relate to Windows servers:-
to the IP address of the firewall (instead of the 192.168.0.1 in their example). I did the other stuff- intalling perl, setting up a process for it, and it has been monitoring since Saturday night now, producing graphs as well within the IIS directory as a generated webpage.
My monitored bandwidth since Saturday night is what I thought my bandwidth peaks were - peaking at around 1.2 megabit a day. To clarify: Currently *their* graph is now peaking at 3 megabit a day, and the lowest point is 1 megabit. My own graph is just peaking at 1.2 megabits a day.
My questions (before resorting to the SDSL plunge which is a one year contract, but payable month to month), relate to general bandwidth bullying by a major UK ISP.
Do they have a legal right to ignore if they chose, my own bandwidth measurement around our firewall using MRTG ?
Is their a Bandwidth accounting Ombudsman in the UK to independently fight on the behalf of a small company against the giant providers in the UK, if they do seem to have very controversial bandwidth graphs?
Would they legally be able to push through a bandwidth fine, irrespective of their own graph now being 3* the amount of bandwidth it was from a few days ago, and my own MRTG evidence?
Originally posted by kevinbl Latency of a SDSL line is usually on par with T1 and not really that big a deal, in the 2-5ms range. I would suggest checking if g.shdsl is available over sdsl. Not only is the speed/distance better, the error correction on the shdsl standard is much better.
I usually see 10-20ms for SDSL, so I'm guessing your area has better DSL than my area of california does.
Thankfully my colocation provider did take notice of the MRTG graphs, and they corrected my bandwidth graph now, and will not be charging me excess bandwidth due to their temporarily incorrect graph. My confidence in them has been restored!
Back to the SDSL - Here is a recent quote I was Emailed by Demon Internet in the UK: (This was as of May 6th 2005)
Further to our conversation earlier today, please find enclosed as promised the Demon Premier Broadband sDSL product information and quotation.
SDSL from Demon allows you to connect to the internet over a standard BT analogue line.
Unlike ADSL, SDSL is symmetrical, meaning that you can enjoy the same upstream bandwidth as downstream, so you can send information and receive it at the same speeds.
The Demon Premier Broadband portfolio can supply your business with a variety of SDSL offerings, ranging from our popular 1 Megabit service (contended at 5:1) up to our 2 Megabit UNCONTENDED service (bandwidth dedicated to your business and it's business critical applications).
If your organisation needs to send data at the same rate as you receive it, SDSL from Demon will definitely satisfy that requirement.
You can choose from the peace of mind of a totally managed service, whereby Demon will provide, configure, install and support your sDSL router or alternatively, if you have in house IT knowledge, we can provide a pre-configured router that is sent to you prior to your service activation date.
If you opt for the managed option, SDSL from Demon comes with an SLA and access to full utilisation statistics accessed via the THUS extranet site.
There are a couple of things that do concern me as well as those mentioned in the above posts - but it may be covered by the "Latency" issue raised.
With a colocation - your servers are usually at a strategic Point of Presence - e.g. the Docklands or Park Royal. With an SDSL set up - would the overhead of getting your data to the POP in the first place be reflected in slower webpages?! Does anyone have a major website hosted with SDSL, and is it reasonable quick for serving webpages globally?!
Also, the limit of 2 Megabit - is this ever likely to be raised?! If you start approaching this limit, then your website(s) would start slowing down.