CPU emulation means full OS stacks on top of another OS. VPS if done like vserver or similar setups means 1 OS stack, and partitions to make the one kernel look like it is all yours.
Benefit to a partitioned approach is one scheduler for all CPU cores and 1 schedule for all disk IO. Even just one kernel cache. If the partitioning uses something similar to vserver hashing, it even means shared exact copies of files. So a physical machine can be more oversold than emulation. Personal experience is that CPU emulation seems to break down on high disk IO before a VPS solution will. I attribute this to multiple IO schedulers not being able to coordinate reads, and the disk head having to thrash as the read requests come from multiple schedules into the host scheduler. Downside to VPS solutions are that it becomes harder to migrate running instances around to newer hardware, or stable hardware. Since only the unique applications to your install are running, and the host OS is not the part getting moved around, you end up tied to the hardware just like the host is. All this is to say that once you install there, you will incur downtime to extract from the hardware and come up elsewhere. At least with emulation, you can have the emulator dump the processor stats and memory, slide it to another machine and restart the instance with so little downtime as to not really notice it. ----- Original Message ----- > Thanks all for some great feedback!!! > > That said, aside from being most likely cheaper, how would you think > VPS virtualization compares to hosted VMware ESX linux guests? Can you > tell a difference, and, if so, where is one likely to see an advantage > of one over the other in practice? I know a little about the core > differences (VMWare true CPU emulation versus VPS' "partitioning" > (right?), but how does that translate to the real world of needing a > "dedicated", hosted linux environment (one versus the other)? > > ----- Original Message ----- > From: "Michael Butler" <[email protected]> > To: [email protected] > Sent: Tuesday, September 20, 2011 11:26:50 PM > Subject: Re: [nlug] Looking for VPS recommendations > > > > I don't have any personal experience with linode but several friends > swear by it. Just my half a cent. > On Sep 20, 2011 8:15 PM, "Michael Chaney" < [email protected] > > wrote: > > > > > > > > I use Iinode.com for 7 or 8 servers at this point and have never had > > trouble. As others have said, their support is responsive and issues > > are quickly resolved. They offer a backup service, but I backup to > > S3 buckets using duplicity. I also monitor with panopta. > > > > Anyway, nice, fast, and easy, and reasonably priced. Highly > > recommended. > > > > -- Michael Darrin Chaney, Sr. > > [email protected] > > http://www.michaelchaney.com/ > > > > -- You received this message because you are subscribed to the > > Google Groups "NLUG" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] For more options, visit this > > group at http://groups.google.com/group/nlug-talk?hl=en > > > -- You received this message because you are subscribed to the Google > Groups "NLUG" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] For more options, visit this > group at http://groups.google.com/group/nlug-talk?hl=en > > -- You received this message because you are subscribed to the Google > Groups "NLUG" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] For more options, visit this > group at http://groups.google.com/group/nlug-talk?hl=en -- Steven Critchfield [email protected] -- You received this message because you are subscribed to the Google Groups "NLUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nlug-talk?hl=en
