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Thread: What Ails My VPS?
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03-17-2012, 12:32 AM #1WHT Addict
- Join Date
- Jan 2012
- Posts
- 169
What Ails My VPS?
I have a VPS with 1.13 Ghz CPU & 768 MB RAM. The database is optimized and there are no PHP errors. I have quick-cache enabled.
It is my experience that whenever I post something and there is a surge of traffic (300-500 concurrent visitors), my VPS becomes non-responsive.
Yesterday, I posted something important which drew 5500 clicks (bitly) in the space of about an hour.
Almost immediately after sending out the email about the post, my site became non-responsive.
However, my CPU & RAM usage parameters (in Plesk) looked normal. Also, I rebooted the VPS twice but the situation did not change till late in the evening.
I can understand a surge of 5500 simultaneous clicks taking down a site but my average hit count is way below this (300-500) and still the site becomes unresponsive.
My questions:
(i)Is it a normal symptom of heavy traffic that a site becomes non-responsive?
(ii)Should not the CPU & RAM parameters in Plesk flash a warning signal?
(iii)Should not rebooting the VPS solve the problem (unless the visitors kept refreshing the page)?
(iv)My VPS provider has installed a "system snapshot" to help trouble-shoot the problem. How does one read this and take precautionary steps to mitigate the problem?
(v) Are there any other diagnostic tools available to trouble-shoot the problem?
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03-17-2012, 02:08 AM #2WHT Addict
- Join Date
- May 2001
- Posts
- 129
May be you need to check Apache usage?
Next time when you post some thing, try to open a console and run top command so that you can know where the load is happening.
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03-17-2012, 02:33 AM #3(formerly WhichGunDotCom)
- Join Date
- Jun 2011
- Location
- Woodbridge, NJ
- Posts
- 840
Sounds like your VPS is I/O-bound, which is very common.
An in-memory cache such as memcached could be the ticket.
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03-17-2012, 11:22 AM #4Web Host Reviewer
- Join Date
- Feb 2006
- Location
- Kepler 62f
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- 16,703
Plesk isn't very lean on Linux (unlike Windows), and 768MB is a minimum just to get the server to run well on modest traffic. You'd really want to look at putting at least 1GB on there -- possibly 2GB given the traffic spike.
Also consider putting nginx in front of Apache, which can be done on Plesk via SSH. There's a guide for it online.
A memcache would help, too. However, you'll definitely want to up your RAM before adding it. As mentioned, 768MB is really a minimum for running Plesk well (and all of its services), and memcache stores even more data in RAM. You'll smack the ceiling easily.
I've been a Plesk user for quite a few years now.|| Need a good host?
|| See my Suggested Hosts List || Editorial: EIG/Site5/Arvixe/Hostgator Alternatives
||
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03-17-2012, 11:34 AM #5Web Hosting Master
- Join Date
- Jul 2010
- Posts
- 819
Take a look at tutorial vii on this site:
http://vps2.me/
Sorry, couldn't resist..
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