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Sunday, 3 June 2012

Enable/Size/Disable memory compression cache

Memory compression is used to improve VM performance when you have memory overcommitment and is enabled by default.  ESXi will attempt to compress memory pages that can be sized down to 2kb.  By default, ESXi will use 10% of the allocated memory to the VMs on the host for memory caching, but can be changed using the advanced options below.
Must modify host advanced settings – Mem.MemZipEnable = 1 – enable or disable memory caching.
Must modify host Advanced Settings – Mem.MemZipMaxPct = (value specified in percentage between 5 and 100)