News about web hosting companyThe new IIS Manager UI extensions are launched as a public beta to get feedback from customers. To facilitate feedback submission, an IIS Manager Feedback module was introduced, where customers can send feedback and suggestions directly to DiscountASP.NET from within IIS Manager.
Google Adwords Guide II - Why Use Negative Keywords
Thu, 05 Jan 2006 00:00:00 EST
When you are running a Google AdWords campaign, it is important to include negative keywords. You should consider the use of negative keywords if some of the keywords or keyword phrases in your campaign are broad and generic.
Share Your Success StoriesTue, 06 May 2008 05:51:22 +0000
Every business has a story to tell.
Our story begins with you and how you have been successful.
Every day we see new customers join our family and community here at BlueFur.com. We would like to hear your story of how you have been successful online and how we have helped you achieve that. I am sure that when ...]
The following is our email exchange - that was very upsetting for us.
Register Your Domain Name RightMon, 05 Mar 2007 17:43:11 +0000
So you’ve got your web site together, you know what your business plan is, and now you’re ready to register your domain name. It’ll be easy, right? Just contact the right site, pay them $35 or so, and you’re done.
Wrong. You can register your domain name this way, but there are better ways to go ...]
That means that you are environmentally friendly and you fall under what is a scam in my opinion with the whole carbon offset project. Bob writes in with this related question…
Moved from Web24 to LinodeFri, 02 May 2008 16:28:28 +1000
(Note: This is a review of VPS hosting services provided by Web24 and Linode, and a migration of one of my sites from one to the other at the end of March 2008.)
Web24 — Virtuozzo VPS in Australia
Back in early this year I talked about writing a review on Web24.com.au, which I used to replace a VPS I got from GPLHost, which I terminated last December as I was using too much bandwidth (and was too cheap to pay :) The VPS I got from Web24 was their Silver package, a Virtuzzo Linux VPS running Ubuntu Linux, with 384MB guaranteed memory, over 6+GB of privvmpages (burstable memory), 50GB/month data transfer, and was located in Fujitsu data centre in Melbourne (see their profile on VPSAU). All these for under AUD$50/month — very affordable for my little sites.
Great Network, Great Uptime, Great Customer Service
Other than the Web24-wide connectivity issue back in February, their network has been rock solid. I am getting around 35ms from my home ADSL2+ to my VPS, and have used 30-40GB a month without issue.
My VPS there also had great uptime. It was up for the entire period — almost 120 days without rebooting. It has certainly demonstrated the stability of Virtuozzo. Hardware wise Web24 was using a 2.4Ghz Xeon with 4x physical core and 8GB of physical memory. However, cpulimit of my VPS has been set to 160% so I can only use around 960Mhz of each CPU core (and 4 cores at the same time), which is not bad at all. Web applications are rarely constrained by CPU power anyway.
Customer service wise — top notch, all the way from pre-sale to support. I have sent in a few support tickets and all of them have been answered in timely manner. GPLHost still has a better service though in my opinion because they are not only solving your problems, reporting back their progress, but also following up after the issues have been resolved.
Then There was Performance Issue
The main reason I am moving away from Web24 is performance, or lack of it. As I have said previously that the server CPUs have more than enough power, but my website over there has suffered much degraded performance throughout February and March, due to large amount of I/O wait.
First of all, what am I hosting there? A small-medium sized Drupal-based community site with around 5,000-7,000 visits per day, 800+k page views and 7.5 million hits per month. Lots of customisation and optimisation, and lots of fragment caching. Lighty on the front-end with 5x PHP+xcache/FastCGI processes (which is more than enough). MySQL 5 with a fat key buffer and query_cache_size to optimise on read requests. I am also trying to stay way below the memory limitation just to be on the safe side. In fact I usually use no more than 200MB under privvmpages. And I thought I was safe.
Not really.
Unfortunately I am not able to reproduce all the communications between Web24 support and myself (as I have a bad habit of deleting old emails), but most support issues I raised were performance related.
Swapping Swapping and Constantly Swapping
20 December 2007 evening, my VPS suddenly stopped responding. Yes it still responded to ICMP pings. Yes you can still connect to port 80, but PHP/FastCGI backend won’t load. SSH in took forever, and once I was in I checked the loadavg it went skyrocket. Type in free -m and I was shocked to discover that all the swap space has been exhausted. free, buffers and cached are all on single digit. Note that on Virtuozzo 3 UBC this is from meminfo of the host server, and has nothing to do with my own VPS. The host server was breathlessly swapping to cope with memory shortage. I cannot remember how long it lasted but it did resolve itself at the end, probably with OOM and some process slaughtering. It wasn’t pretty.
So in the middle of my panicking, I fired a support request. It was escalated and a few hours later someone responded saying it was a CPU issue rather than memory issue, and was caused by someone else’s VPS getting compromised. The swap space on the host server then got increased from 2GB to 12GB. I was trying to argue that it WAS a memory/swapping issue, and my processes cannot get enough CPU time because everyone was busy paging in and out! Nope. Web24 denied about it. The problem was with the CPU they said, which was definitely not what vmstat told me.
I/O Wait Issue Got Worse
Performance irregularity continued, and got worse around February and March. During peak hours (which for my site is 9am-11pm AEST), the 15-minute load average might go up to 4-5 for a period of 5-10 minutes every now and then, and my site would completely stall. 15-minute load average doesn’t drop back down below 0.5 during peak hours, and simple commands line ls feels sluggish — a sure sign of I/O wait issue. Swap usage on the host server has been ranging from 4GB-6GB (out of 12GB total swap space), and sometimes some of my key processes got swapped out even though I am only using half the guaranteed memory.
So I posted this question at WebHostingTalk (without mentioning who the provider was), and asked for opinions.
The question I would like to ask is — is it possible to pin-point why the VPS is slow? My apps are obviously not CPU bounded, and as iostat is not really working in Virtuozzo I cannot tell whether it is IO-bounded inside my VPS either. Is it possible to find out whether it is due to excessive paging on the physical server, so I can go to my provider and say, “hey you are overselling and you should not pack that many VE into a physical server”.
And the responses I’ve got:
… when a VPS node is using ANY swap at all that’s your first warning sign that the server is being pushed to its extremes.
— seankoons at Zone.net
My take: It’s vastly oversold…
— TheWiseOne at TekTonic
If 5GB of SWAP is being used, I’d say they are overselling…
— devonblzx at Reseller3k
Well. I guess I got te message. Despite claims that “We do not overcommit on our VPS infrastructure”, looks like Web24 has just jammed too many people onto that host node. Or maybe my hypothesis with UBC-based VPS hosting is true — by providing 6+GB of burstable memory, you are basically inviting everyone to use as much as they want, and OOM won’t kick in until swap space has been exhausted — which would be probably too late. In that case they might not be overselling if they calculated with the amount of guaranteed memory, but poor UBC settings can still make you look bad. Not that I am going to be hosted with another UBC-based VPS provider anyway.
Moved to Linode
As traffic to my website has also been slowly growing, I was facing two choices — move up to the next plan, or move elsewhere (again). With the performance issues at Web24, I do not think moving up to the 512MB guaranteed plan will do any wonder. AUD$50/month is all I am willing to pay anyway, which means I won’t be able to find any virtual servers in Australia that will fit in my budget. With over 85% of traffic coming from Down Under, it makes sense to also host my site in Australia. But when budget becomes a constraint — well I guess I can live with a bit of latency.
As I still kept a Xen VPS at Linode after my review in January (yes, I actually became a customer), it is at Fremont CA which is “close enough” to Australia for me, I decided to make a migration from Web24 to Linode at the end of March.
So one evening I changed the DNS TTL to 15 minutes, put up a maintenance notice on my website, copy all the files across (which was less than 200MB), set everything up at Linode, make sure everything works, and update the DNS records to let them propagate. The next morning — traffic as usual, and everything “just works”. You do feel the lag typing inside a SSH session, but you cannot actually tell much difference with page serving. I guess the poor performance at Web24 sort of cancels out the benefit of low latency.
My community site has now been running for a month now at Linode and the performance has been great. In April it has been 8,000+ visitors/day and used around 62GB of data. Linode Platform Manager shows 4% of average CPU utilisation last month, and my Linode 360 uses little swap and always has 200+MB of (free + buffers + cached). 15 minute loadavg rarely goes above 0.1… 200GB/month of data transfer means it will probably last me a while.
Verdict
A few concluding points:
Don’t always believe what the support says. Gather your own evidence. Even a vmstat dump can point out roughly where the bottleneck is.
Xen >> Virtuozzo. Yes I know Matt is advertising here, but personally I still much prefer Xen than Virtuozzo. At least you get a virtualised block device where iostat can tell you how much I/O you are doing.
-
When you have high load on a Virtuozzo/OpenVZ VPS, adding more memory have no value by itself (despite many have suggested this at WHT). If you are CPU-bound (not likely) — check whether there’s a cpulimit on your VPS and ask your provider to remove it. If you are IO-bound (very likely), then you can go and get more memory PLUS implement aggressive caching throughout the stack so hopefully there is less load on the database, if you are the trouble maker.
If you are not the one causing the problem, or maybe optimisation is not your cup of tea, then prepare to jump ship.
Oversold VPS exists.
Site Updates and NewsTue, 31 Oct 2006 18:43:27 +0000
I’ve updated the site today, fixing a few small things. Mainly the reason was due to a huge amount of comment spam that we’ve been receiving. Check this out:
Total Unapproved Comments: 1,177
That’s a lot of comment spam! I was getting really sick of all the junk links and stuff I had to sort through ...]
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Businesses have several motivations for building business websites. For some, the Internet is their only customer base, for others they want to promote professional services and add to an existing clientele. There may be different needs and motivations but there are some common characteristics for successful business websites that all businesses ought to take note of.
