Knowledge base
How to change instance type?
Posted by Piotr Malendo on 25.04.2013 20:03

1. Operation of upscaling

If the following conditions are meet:

  • instance works on Linux,
  • executed change of instance class requires the increase of memory over 3 GB (change between Small and Large class),

then to the full completion of the procedure you must restart the instance. It is possible to reset and change classes at once (press the button: Yes for restart), or to schedule a restart at a more convenient time (press the button: Add to scheduler).

Note. Adding a task for class changing to scheduler will set the procedures by default at 23:55. At any time you can cancel the job or change time via the Scheduler tab in the instance view panel.

Explanation. The described operation is the result of the management of Linux x64-class memory, kernel family of 2.6.x. If the activation took place with less than 3 GB, then kernel does not run the SWIOTLIB module, it forbids to make dynamic address more memory. Forcing the run of SWIOTLIB even by setting the kernel parameter IOMMU = soft, in turn, causes a problem with dynamic memory allocation under 3 GB.

 

2. Operation of downscaling

In case of lower-class initiation due to the lack of implementation: MEMORY / CPU-HOTREMOVE by modern operating systems, the successful completion of the procedure is only possible by restart the instance. It can be done by reset and change classes at once (press the button: Yes for restart), or to schedule a restart at a more convenient time (press the button: Add to scheduler).

Note. Adding a task for class changing to scheduler will set the procedures by default at 23:55. At any time you can cancel the job or change time via the Scheduler tab in the instance view panel.
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