System Header Files for Storage Drivers. Restrictions on Pageable Code in Storage Drivers. Querying for the Write Cache Property. Subsequent sections contain guidelines for designing the following kinds of Windows kernel-mode storage drivers:.
A class driver for a new type of peripheral device see Storage Class Drivers. Want to evaluate Storage Spaces Direct but don't have hardware?
The fully configured cluster servers, networking, and storage must pass all cluster validation tests per the wizard in Failover Cluster Manager or with the Test-Cluster cmdlet in PowerShell.
For more help choosing drives, see the Choosing drives topic. Drives can be internal to the server, or in an external enclosure that is connected to just one server. Each external enclosure must present a unique identifier Unique ID. This table provides the minimum for hardware deployments. If you're deploying with virtual machines and virtualized storage, such as in Microsoft Azure, see Using Storage Spaces Direct in guest virtual machine clusters.
Simple spaces are designed for increased performance, but don't protect your files from drive failure. They're best for temporary data such as video rendering files , image editor scratch files, and intermediary compiler object files.
Simple spaces require at least two drives to be useful. Mirror spaces are designed for increased performance and protect your files from drive failure by keeping multiple copies. Two-way mirror spaces make two copies of your files and can tolerate one drive failure, while three-way mirror spaces can tolerate two drive failures.
Mirror spaces are good for storing a broad range of data, from a general-purpose file share to a VHD library. When a mirror space is formatted with the Resilient File System ReFS , Windows will automatically maintain your data integrity, which makes your files even more resilient to drive failure. Two-way mirror spaces require at least two drives, and three-way mirror spaces require at least five.
Parity spaces are designed for storage efficiency and protect your files from drive failure by keeping multiple copies. Parity spaces are best for archival data and streaming media, like music and videos. This storage layout requires at least three drives to protect you from a single drive failure and at least seven drives to protect you from two drive failures.
After you upgrade to Windows, we recommend that you upgrade your existing pools. With an upgraded pool, you can optimize drive usage and remove drives from pools without affecting the pool's protection from drive failure. Note: Upgraded pools aren't compatible with previous versions of Windows.
When you add new drives to an existing pool, it's a good idea to optimize drive usage. This will move some of your data to the newly added drive to make the best use of the pool's capacity. With these solutions, your enterprise can:. And, with the Nutanix software running on each appliance, HDDs and SSDs can be aggregated across all nodes, with thin provisioning, compression, and deduplication to increase effective storage capacity.
This modular and balanced architecture enables non-disruptive increases in performance and capacity, allowing environments to adapt quickly and easily to dynamic, ever-changing demands.
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