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09-07-2013, 12:29 PM #1Web Hosting Master
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whats is the Guaranteed RAM & Burst RAM?
whats is the Guaranteed RAM & Burst RAM?
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09-07-2013, 12:33 PM #2Web Hosting Evangelist
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Guaranteed ram is the ‘amount’ of ram that is always available to you. The BURST ram refers to the ram you can use when other users on the node are not consuming much ram which means you are able to go beyond your guaranteed ram.
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09-07-2013, 01:01 PM #3Web Host Reviewer
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No, that's wrong.
The whole "burst" thing is a creation of the now-outdated OpenVZ UBC method. (Note that OpenVZ now uses vswap.)
Originally Posted by kpmedia (some post I wrote in the past)
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09-07-2013, 07:43 PM #4Web Hosting Master
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It's irrelevant with 2.6.32 kernel. If someone is still advertising burst don't use them or ask them to move you to a server with the .32 kernel.
Having said that, the only number that ever mattered with the .18 kernel was burst. It doesn't matter what the guaranteed ram setting was. It could be 1MB (if that's even possible). As long as burst was set to 1GB then that is how much memory you have.
The one and only exception is if the physical server completely runs out of RAM + SWAP. Then the kernel will start shutting down processes in the burst memory space first. That situation should never ever happen and would be a problem even if your VPS ran completely in guaranteed memory.
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09-08-2013, 06:39 AM #5Web Host Reviewer
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It mattered, as it was the kill limit for processes.
The one and only exception is if the physical server completely runs out of RAM + SWAP. Then the kernel will start shutting down processes in the burst memory space first. That situation should never ever happen and would be a problem even if your VPS ran completely in guaranteed memory.
There's still too many hosts and "hosts" out there using UBC. It sucks.|| Need a good host?
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09-08-2013, 12:26 PM #6Web Hosting Master
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This one got me confused too, the first time
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09-08-2013, 12:48 PM #7Web Hosting Master
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09-08-2013, 04:41 PM #8Web Host Reviewer
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09-08-2013, 04:49 PM #9Web Hosting Master
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Well I suppose that UBC might be better for low-end box VPS hosts, users can't do nearly as much with x amount of RAM. You can cram a lot more 256mb UBC vps servers on a machine in comparison to vswap.
Can't think of a single instance where it would be good for the end-user.WHMEasyBackup.com - Take Control Of Your Backups!
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09-08-2013, 09:30 PM #10Retired Moderator
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UBC uniquely gave unscrupulous providers the opportunity to deceive their users into thinking that:
- they were getting something extra
- their server needed / used more memory than it actually did
The second must have been particularly useful for customer retention - after all who would believe after seeing say 500MB of memory usage in "free -m", that they could switch to a 256MB VPS from another provider and not run out of memory...
When it comes time to upgrade, those providers using "honest" UBC setups (eg. 256MB VPS with 512MB burst) would have no problem switching to an equivalent vswap system (256MB VPS plus vswap). But providers who offered "no burst" plans (ie. burst limit = guaranteed limit = nominal VPS memory) would have a more difficult time. Take a "512MB" VPS with 512MB burst - that's roughly equivalent to a 256MB VPS on vswap (or any other system). But if you have users on such a plan, can you afford to give them a free upgrade to a 512MB vswap system, or must you explain why a 256MB is just as good? And how would you explain that without also admitting that you originally sold them a "512MB" VPS with only 256MB of usable memory? Tricky.Chris
"Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them." - Laurence J. Peter
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09-08-2013, 09:51 PM #11Web Hosting Master
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09-10-2013, 06:19 AM #12Newbie
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Our hosts, eUKhost, still advertise a burstable ram allowance, which we make use of.
I dont know the ins and the outs, but from our point of view it appears to give a cost effective way of increasing our RAM allowance from 2gb to 4gb and in doing so appearing to resolve our memory shortage issues.
Although I have no idea what is happening behind the scenes the marketing lead me to the impression given by in neq3sam the first response.
Daniel
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09-10-2013, 06:38 AM #13Web Host Reviewer
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09-10-2013, 06:40 AM #14Retired Moderator
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"appears to" is exactly right. The UBC system is overestimating your memory usage, perhaps by a factor of about 2. But in compensation your provider gives you a "burst" limit of double your plan memory. So overall you get approximately what you paid for, which is all you can reasonably expect.
Edit: damn, beaten by kp again!Chris
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09-10-2013, 06:52 AM #15Web Host Reviewer
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09-10-2013, 06:56 AM #16Web Hosting Master
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Guaranteed memory is the amount of memory allocated to your VPS which you can use up to at any time. Burst allows your VPS to use more than your guaranteed memory as long as the memory is available to use up to the burst limit.
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09-10-2013, 07:03 AM #17Web Hosting Master
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09-10-2013, 07:16 AM #18Retired Moderator
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09-10-2013, 07:23 AM #19Web Host Reviewer
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09-10-2013, 11:13 AM #20Newbie
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09-10-2013, 10:15 PM #21Web Hosting Master
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Once again because some commenters here still have it wrong. The ONLY setting that matters is burst. Just pretend guaranteed does not exist because it does not matter. If it did you have much bigger problems because the node has run out of RAM+SWAP which will make all VPS's basically unusable anyways.
http://lowendbox.com/blog/why-i-dont...stable-memory/
http://hostingfu.com/article/guaranteed-memory-openvz
Completely irrelevant anyways unless the node is still running the old .18 kernel.
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09-10-2013, 10:53 PM #22Web Hosting Master
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You shouldnt care about Guaranteed RAM & Burst RAM, get a VPS provider with 2.6.32 kernel nodes and enjoy life
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09-10-2013, 10:59 PM #23Retired Moderator
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Agreed, but that's only half the picture. The other vital point is that memory usage isn't accounted properly. Your usage will be overestimated so you need the burst limit to be higher than the nominal VPS memory.
Thanks for illustrating the point. The figures shown to you in WHM (both available and used) or in top, or in free (or anything derived from /proc/meminfo) are fabricated, and on UBC systems the method used to calculate those numbers is badly flawed. So if you think you're using 2GB, the chances are your real usage is around 800MB - 1GB (having usage overestimated by a factor of about 2 to 2.5 is typical for linux servers). Happily, your provider is an honest one who's sold you this as a "2GB" VPS, and indeed you'd probably get up close to 2GB of real usage (4GB reported) before running into problems, but don't think for a moment that you actually have (or need) 4GB.
The only real information on your memory usage can be found in /proc/user_beancounters, which unfortunately takes some experience to interpret (post it here if you'd like it interpreted).Chris
"Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them." - Laurence J. Peter
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09-10-2013, 11:48 PM #24Newbie
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09-11-2013, 01:07 AM #25Web Hosting Master
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Once again because for some reason people STILL don't get it. The ONLY only only setting that matters is burst. As a rule burst is ALWAYS always always set to equal or greater then guaranteed and since guaranteed does not matter the burst setting is AGAIN....ALWAYS always always the only setting that matters. That's just how it works. So I don't know what you are trying to say or if you even understand what you are trying to say.
If you want to say there is a time when burst vs guaranteed matters you are talking about a situation which basically makes the node unusable so it NEVER never never matters.
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