Comments on: Impact of memory reservation

By: Memory states » Yellow Bricks

Memory states » Yellow Bricks — Tue, 17 Aug 2010 15:20:57 +0000

[...] explained in Frank’s excellent article on memory reservations, ESX/ESXi uses memory states to determine what type of memory reclamation technique to use. [...]

By: Virtual machine memory overhead | frankdenneman.nl

Virtual machine memory overhead | frankdenneman.nl — Mon, 31 May 2010 15:49:28 +0000

[...] to performance degradation. The VMkernel treats virtual machine overhead reservation the same as VM-level memory reservation and it will not reclaim this memory once it [...]

By: Jason

Jason — Fri, 21 May 2010 22:58:06 +0000

Frank,

Great post. Question though, when you mention changing the default logging levels for vCenter are you suggesting that these be a permanent change or just for when you are doing special/needed logging?

Thanks in advance,

-Jason

By: Resource pools memory reservations |

Resource pools memory reservations | — Tue, 18 May 2010 19:42:50 +0000

[...] publishing the article “impact of memory reservations” I received a lot of questions about setting memory reservation at resource pool level. It [...]

By: VMware vSphere Fast Track Day#4 – Lessons Learned « DeinosCloud

VMware vSphere Fast Track Day#4 – Lessons Learned « DeinosCloud — Thu, 01 Apr 2010 23:05:23 +0000

[...] use reservation, on the opposite the use of limits should be done carefully. Read Frank Denneman’s great article about shares, limit and [...]

By: Impact of memory reservation « Frank Denneman

Impact of memory reservation « Frank Denneman — Tue, 09 Mar 2010 08:53:58 +0000

[...] Leave a comment Go to comments This blog is no longer active. The new home of this article is: http://frankdenneman.nl/2009/12/impact-of-memory-reservation/ Sorry for the inconvenience Possibly related posts: (automatically generated)Love Your Balloon [...]

By: Bob Neland

Bob Neland — Tue, 02 Mar 2010 23:32:05 +0000

I have 1 ESX3.5 host that itself uses much more swap in the Service Console than the other two in the cluster – Not specifically related to this thread I believe, but is there a good reference as to how the service console allocates or uses it’s own dedicated swap partition, in relation to the number/size/configuration of the configured VM’s that run on that host???

thanks,

Bob

By: Impact of host local VM swap on HA and DRS |

Impact of host local VM swap on HA and DRS | — Mon, 15 Feb 2010 10:40:45 +0000

[...] Reservations will guarantee that this specific amount of virtual machine memory is (always) backed by ESX machine memory. Swap space must be reserved on the ESX host for the virtual machine memory that is not guaranteed to be backed by ESX machine memory. For more information on memory management of the ESX host, please my article on the impact of memory reservation. [...]

By: Frank Denneman

Frank Denneman — Mon, 11 Jan 2010 21:54:59 +0000

I advice my customers to monitor the active memory usage and set the reservation accordingly. Remember set the reservation to the minimum level which guarantee you a well enough performance “baseline”.

By: BC

BC — Fri, 08 Jan 2010 21:37:43 +0000

Nice read….

I was told at one of my VMware classes to set all my VM’s memory reservations to 128mb (Eventhough I think I read if set to zero min is 256mb) if I wasn’t using resource pools. Eventhough the .vswp’s are using alot of extra space on my LUNS since most of my VM’s are allocated 2 to 3 gigs of RAM everything seems to work great. What do you usually set?