#ADD MORE DISK SPACE TO HYPER V WINDOWS#

This cache helps smooth out write operations (thereby improving write performance) by taking 1 GB of space away from your fast tier.

#ADD MORE DISK SPACE TO HYPER V WINDOWS#

The reason for this is that if sufficient space is available, then Windows will use 1 GB of the fast tier as a write-back cache.

It is a good idea to estimate how much space you will need and then add at least 1 GB to that estimate. When you create a virtual hard disk that uses storage tiers, you are able to specify the amount of SSD space you wish to allocate to the fast tier. For example, if you are creating a three-way mirror then you will need three SSDs.

If you are planning to use tiered storage with a mirrored volume, then Windows requires the number of SSDs in the storage pool to match the number of mirrored disks. Storage tiers cannot be used with parity disks, even though this was allowed in the preview release. The most pressing one is that storage tiers can only be used with mirrored virtual hard disks or simple virtual disks. The tiered storage feature greatly improves VM performance, but there are some limitations. You can implement the tiered storage feature on a per-virtual-hard-disk basis and allow 'hot blocks' to be dynamically moved to a solid-state drive (SSD)-based storage tier so they can be read with the best possible efficiency. Microsoft expanded the Windows Storage Spaces feature in Windows Server 2012 R2 by introducing new features such as three-way mirroring and storage tiering. You can create virtual disks on top of a storage pool without having to worry about physical storage allocations. Microsoft introduced Windows Storage Spaces in Windows Server 2012 as a way of abstracting physical storage into a pool of storage resources. Considerations for Windows Storage Spaces This allows you to granularly apply Quality of Service Management policies in a way that gets the best possible performance from your available IOPS. The Quality of Service Management feature is set on a per-virtual-hard-disk basis rather than a per-VM basis. Similarly, you can cap a virtual hard disk's I/O operations by specifying a maximum number of allowed IOPS. This feature allows you to reserve storage IOPS for a virtual hard disk by specifying a minimum number of IOPS. Managing QoS for effective storage I/OДЄnother tool for reducing the problem of storage I/O contention is a new Windows Server 2012 R2 feature called Quality of Service Management (formerly known as Storage QoS). But there is one major caveat: This type of deduplication is only supported for virtual desktops, not virtual servers.Дeduplication can reduce IOPS and improve performance for Hyper-V virtual servers, but the only way to realize these benefits in a supported manner is to make use of hardware-level deduplication that is completely transparent to the Hyper-V host and any guest operating systems. Microsoft did some more work on the deduplication feature in Windows Server 2012 R2 and now you can deduplicate a volume containing virtual hard disks that are being actively used. Although this feature at first seemed promising, it had two major limitations: Native deduplication was not compatible with the new ReFS file system and native deduplication was not supported for volumes containing virtual hard disks attached to a running virtual machine. Microsoft introduced native file system deduplication in Windows Server 2012. However, there are some important limitations that must be considered. One of the best tools for reducing storage IOPS is file system deduplication. Virtual hard disks often reside on a common volume or on a common storage pool, which means the virtual hard disks must compete for IOPS.ДЄlthough there isn't a universally applicable, cheap and easy solution to the problem of storage resource contention, there are a number of different mechanisms Hyper-V administrators can use to get a handle on the problem. More often however, resource contention is the bigger problem. However, it is also important to consider the impact VM sprawl can have on your storage infrastructure.ДЄs more and more VMs are created, storage consumption can become an issue. The problem of VM sprawl is most often dealt with by placing limits on VM creation or setting policies to automatically expire aging virtual machines. Microsoft's licensing policy for Windows Server 2012 Datacenter Edition, and tools such as System Center Virtual Machine Manager, have made it too easy to create VMs if left unchecked, VMs can proliferate at a staggering rate. One issue that virtualization administrators must routinely deal with is virtual machine (VM) sprawl.

Add more disk space to hyper v