Its storage efficiency is 25 percent with nested two-way mirroring and around 35-40 percent for nested mirror-accelerated parity. Nesting provides data resilience even when one server is restarting or unavailable. Nested resiliency provides data resiliency between servers with two-way mirroring, then adds resiliency within a server with two-way mirroring or mirror-accelerated parity. Two-way mirroring can safely tolerate one hardware failure at a time (one server or drive). Its storage efficiency is 50 percent to write 1 TB of data, you need at least 2 TB of physical storage capacity in the storage pool. Two-way mirroring keeps two copies of all data, one copy on the drives in each server. With two servers in the cluster, you can use two-way mirroring or you can use nested resiliency. Which resiliency types you can choose is independent of which types of drives you have. If your workload requires a feature that ReFS doesn't support yet, you can use NTFS instead. See the ReFS feature comparison table for details. It supports nearly all key NTFS features, including Data Deduplication in Windows Server version 1709 and later. ReFS is the premier filesystem purpose-built for virtualization and offers many advantages, including dramatic performance accelerations and built-in protection against data corruption. We recommend using the new Resilient File System (ReFS) for Storage Spaces Direct. We recommend limiting the total number of volumes to 64 volumes per cluster. This allows the cluster to distribute volume "ownership" (one server handles metadata orchestration for each volume) evenly among servers. For example, if you have 4 servers, you will experience more consistent performance with 4 total volumes than with 3 or 5. We recommend making the number of volumes a multiple of the number of servers in your cluster. Once created, they show up at C:\ClusterStorage\ on all servers. Understanding these implementation-level distinctions is not necessary to plan and deploy Storage Spaces Direct successfully.Īll volumes are accessible by all servers in the cluster at the same time. All existing RAID groups and storage systems will not be affected.We use term "volume" to refer jointly to the volume and the virtual disk under it, including functionality provided by other built-in Windows features such as Cluster Shared Volumes (CSV) and ReFS. This enhancement will only be applied to new RAID groups. Nevertheless, users can combine multiple RAID groups into a large storage pool that contains more than 16 drives, using RAID 50, RAID 60, or RAID 10 as the RAID configuration. To ensure data security, system stability, and storage performance, the maximum number of drives for a single RAID group is now 16 (applicable to RAID 5, RAID 6, RAID TP, and subgroups of RAID 50 and RAID 60).The values calculated may differ from the actual results. Results from the RAID Calculator should be used as a reference only.Refer to the compatibility list for more information. Some NAS models may not support drives with specific capacities, but they can still be used in other combinations or with expansion devices.Once this limit is exceeded, you may need to create multiple storage spaces or designate a drive as a "hot spare". Different models will limit the capacity of a single storage space.Refer to the QTS Storage & Snapshots Manager for the actual space allocation size. The estimated result may differ from the actual storage space. The QNAP RAID Capacity Calculator estimates the storage utilization of various drive configurations and RAID levels on QNAP NAS.Īctual drive storage space will vary based on the system space capacity and drive manufacturer.Support Milestone Surveillance Platform.NAS Smart Surveillance System Solutions.NDR Solutions against Targeted Ransomware.Software-defined Platform Total Solution.Support Platform9’s Managed OpenStack Solution. ![]() Veeam-Ready and Virtualization Certifications.With Linux and ZFS, QuTS hero supports advanced data reduction technologies for further driving down costs and increasing reliablility of SSD (all-flash) storage. QuTS hero is the operating system for high-end and enterprise QNAP NAS models. WIth Linux and ext4, QTS enables reliable storage for everyone with versatile value-added features and apps, such as snapshots, Plex media servers, and easy access of your personal cloud. QTS is the operating system for entry- and mid-level QNAP NAS.
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