Microsoft Windows New File Systems ReFS for Windows Server 8
ReFS, short for Resilient File System, will initially debut with Windows 8 Server, but is expected to make its way through to Windows 8 client system to support the full feature set of Storage Spaces, which will allow users to create storage pools from multiple physical and virtual storage devices.In Windows 8 there is no way to convert data in place. Data can be copied. This was an intentional design decision given the size of data sets that we see today and how impractical it would be to do this conversion in place, in addition to the likely change in architected approach before and after conversion.Although it is designed to be better in many dimensions, resiliency stands out as one of its most prominent features.
According to Microsoft, ReFS will be an always-online file system "for the next decade or more" that is architected for "extreme scale" with large volume, file and directory sizes, as well as data verification and auto-correction via checksums while maintaining compatibility with a "wide subset of widely adopted" NTFS features.In Windows 8 there is no way to convert data in place. Data can be copied. This was an intentional design decision given the size of data sets that we see today and how impractical it would be to do this conversion in place, in addition to the likely change in architected approach before and after conversion.
Along with Storage Spaces coming in Windows 8, ReFS forms the foundation of storage on Windows for the next decade or more. Key features of the two when used together include: metadata integrity with checksums; integrity streams providing optional user data integrity; allocate on write transactional model for robust disk updates; large volume, file and directory sizes; storage pooling and virtualization making file system creation and management easy; data striping for performance and redundancy for fault tolerance; disk scrubbing for protection against latent disk errors; resiliency to corruptions with "salvage" for maximum volume availability in all cases; and shared storage pools across machines for additional failure tolerance and load balancing.
ReFS does not itself offer deduplication. One side effect of its familiar, pluggable, file system architecture is that other deduplication products will be able to plug into ReFS the same way they do with NTFS.
ReFS does not explicitly implement a second-level cache, but customers can use third-party solutions for this.ReFS and VSS work together to provide snapshots in a manner consistent with NTFS in Windows environments. For now, they don’t support writable snapshots or snapshots larger than 64TB.
The table below shows the capacity limits of the on-disk format. Other concerns may determine some practical limits, such as the system configuration (for example, the amount of memory), limits set by various system components, as well as time taken to populate data sets, backup times, etc.Microsoft recently announced that they will be introducing a new file system, ReFS, with Windows 8, retaining some elements of NTFS file system while providing new features to improve performance, scalability, and resiliency.
Melio from Sanbolic provides high performance, availability, scalability, and resiliency for Windows deployments, and is available today!Melio file system is designed for large virtual and cloud environments. It is running in production in hundreds of enterprise customers, and It will support Win 8, while protecting your investment in Windows 2008 R2, Windows 2008, and even Windows 2003 SP1. Melio allows you to extend the storage stack capability of Windows application servers as well and Microsoft Hyper-V. It uses 64 bit architecture for tremendous scalability, and distributed on-line file system integrity checks as well as integrated snapshots and synchronous and asynchronous mirroring for data protection and availability. It aggregates storage across heterogeneous storage hardware (including internal server storage) provides centralized management , reduces management cost and dramatically improves storage utilization while integrating with native Windows technology .
Distributed lock manager to provide active-active access for any Windows workload, while using a fully symmetrical architecture for availability.
- Any Windows server workload on physical or virtual resources can utilize active-active data access to scale out applications and to provide new options for availability.
- Dynamically provisions volumes, data protection levels, and QoS to ensure consistent application performance and align with user-defined policies in physical and virtual environments
- Single management framework to reduce storage related costs and complexity
- Multi-hypervisor and Multi-Site support
Melio was initially designed for large telecom network operations center environments using distributed computing architectures and requiring 99.999% uptime. Melio integrates advanced storage components, including a clustered file system and volume manager, rapid resource provisioning, and quality of service (QoS), into a workload, hypervisor and hardware agnostic offering. It has proven itself across a range of large and small enterprises and government deployments worldwide. And it is simple and intuitive to use—integrating easily into Windows server deployments. Melio provides the performance, scalability, and features needed in large virtual and cloud deployments.
Limit based on the on-disk format
Maximum size of a single file
2^64-1 bytes
Maximum size of a single volume
Format supports 2^78 bytes with 16KB cluster size (2^64 * 16 * 2^10). Windows stack addressing allows 2^64 bytes
Maximum number of files in a directory
2^64
Maximum number of directories in a volume
2^64
Maximum file name length
32K unicode characters
Maximum path length
32K
Maximum size of any storage pool
4 PB
Maximum number of storage pools in a system
No limit
Maximum number of spaces in a storage pool
No limit
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