What is recommended size of System drive to keep operating system files , paging files and Memory Dump of hyper-v host.

Hi ,
I want to setup hyper-v host with 128 GB RAM  , Windows 2012 R2
What is recommended size of System drive  to keep operating system files  , paging files  and Memory Dump?
I tested to using 150 GB  , but when the server is crashed, there is no free space to keep memory dump file.
Ramy

Hi Ramy,
For Server 2012R2 the absolute minimum system drive is 32Gb but this assume you have limited RAM or have your Page file located on another drive. It used to be best practice to setup a small page file but MS PFE now suggest leaving windows to manage
the page file size.
Obviously this is not always possible depending on the amount of RAM in the system, but base the system drive around this or offload the Page file to perhaps another drive. On top of this you also need space for the memory dump to be written, potentially
again up to the size of the RAM. Assuming you fire the machine back up after a crash, you need space for the OS, the Page File plus space for the associated dump file.
There is a nice little article here that maybe of assistance:  http://social.technet.microsoft.com/wiki/contents/articles/13383.best-practices-for-page-file-and-minimum-drive-size-for-os-partition-on-windows-servers.aspx
Kind Regards
Michael Coutanche
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