It's important to note that Windows Server does not require solid-state disk drives for write back cache. When...
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
only traditional magnetic disks are deployed in a virtual disk (no solid-state disks are available), Windows Server can create a small, 32 MB write back cache in memory.
In order to deploy larger write back caches based on larger, solid-state disks, an organization will require Windows Server 2012 R2 and at least SSD. When a new virtual disk volume is created, administrators will have the option to create a 1 GB write-back cache on the SSD.
If cache must be created on high-resiliency servers configured with mirrored drives, additional SSDs may be needed. For example, two-way mirrors using single parity require two SSDs, while three-way mirrors using dual parity will need three SSDs.
Administrators can check the write-back cache status for every virtual disk on the server using the Get-VirtualDisk cmdlet in PowerShell. An example command line might look like this:
PS C:\Server1\Admin> Get-VirtualDisk | Select-Object FriendlyName, Size, WriteCacheSize
This command displays the name of each volume, its volume size and its cache size.
Write caching reduces application latency by making writes to fast memory instead of to a slower disk. It's a well-established technology, but has often been avoided because of the potential for catastrophic data loss. The adoption of SSD devices is quickly bringing write caching to the forefront, allowing inherently nonvolatile SSD space to serve as write cache. Windows Server 2012 R2 includes native support for SSD-based write-back caches, which can be created on demand as new virtual disks are provisioned for the enterprise. This offers administrators a new tool for accelerating busy, write-intensive, mission-critical workloads without the traditional concerns of expensive, battery-backed write caching subsystems.
Why write back cache can create performance boosts
Altering write back cache size
Dig Deeper on Windows File Management
Related Q&A from Stephen J. Bigelow
Photon Controller and vSphere Integrated Containers both manage containers, but in different ways. What's the difference between these utilities, and...continue reading
Photon OS optimizes VMware Photon platform deployment, not only in vSphere but in GCE, EC2 and more. Follow these steps to learn how to run Photon OS...continue reading
Performance problems can be caused by a number of things, including overprovisioning and poor vCPU selection and assignment to VMs. Use these ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.