Tag Archive: Memory overcommitment

Jun 06 2011

Using SSD technology to support memory overcommitment in vSphere

With applications becoming increasingly memory-hungry, memory always seems to be the resource in the shortest supply on a host. In a virtualized server environment, the lack of sufficient physical memory can have a real impact on project ROI, since it will limit the density that you could otherwise achieve.

That’s because, while CPU sockets can support an ever-increasing number of cores, for maximum efficiency, a host has to have a balance of resources available to virtual machines (VMs). If a resource shortage occurs in any one area on a host — such as RAM — the number of VMs that the host can run will be restricted despite plentiful resources in other areas.

The technique of memory overcommitment in a virtualized environment can help mitigate the problem, and using SSD to handle memory overcommitment can produce better results at a lower cost than memory overcommitment on mechanical disk.

Let’s examine the memory limitations of server hardware, how memory overcommitment works, and how solid-state drive (SSD) technology can address the problem.

Read the full article at searchvirtualstorage.com…

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Jun 06 2011

Hyper-V dynamic memory allocation vs. VMware memory overcommit

Hyper-V Dynamic Memory is Microsoft’s answer to VMware memory overcommit.

Dynamic memory allocation and memory overcommit both aim to improve memory management in virtual server infrastructures, and they even use common technologies. But they take different approaches and offer very different user experiences.

These differences — plus the fact that Hyper-V lacked dynamic memory allocation until this year — have spurred much debate among VMware and Microsoft users about the merits of each feature. In this face-off, two virtualization experts debate the pros and cons of Hyper-V Dynamic Memory and VMware memory overcommit.

Hyper-V dynamic memory allocation: A superior approach
VMware memory overcommit: Do it right to begin with

Read the full article at searchservervirtualization.com…

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