The hardware-based RAID controller architecture is more expensive than software-based RAID, but it can improve system performance without boot errors. Now, let’s see the advantages of the RAID controller card. The storage controller provides the active disk to the system, while the RAID controller acts as a RAM cache and provides RAID functions. The RAID controller is not a storage controller. To request a new product feature or to provide feedback on a StarWind product, please send an email to put “Product Feature Request” in the subject line.RAID controllers are classified by the multiple characteristics include drive types(such as SATA or SAS), specific RAID levels, and the number of ports and supported drives. SSD, NVMe disks can be used in parity arrays (RAID5, RAID6). 3,5,9…) and for RAID6 – power of 2 + 2 disks (e.g. The number of disks in the RAID10 array should be equal to a power of 2 (e.g. RAID Level Chunk size for HDD Arrays Chunk size for SSD ArraysĠ Disk quantity * 4Kb Disk quantity * 8Kbĥ (Disk quantity – 1) * 4Kb (Disk quantity – 1) * 8KbĦ (Disk quantity – 2) * 4Kb (Disk quantity – 2) * 8Kbġ0 (Disk quantity * 4Kb)/2 (Disk quantity * 8Kb)/2
The chunk size of the array should be calculated using the following formulas: For SSD drives chunk size must be equal to 8KiB (which equals the size of the SSD drive page cache).
NOTE: It is recommended to assign more vCPUs to StarWind VM which has Linux Software RAID configured.įor 4k native HDD drives, chunk size must be equal to 4KiB per one drive. Linux Software RAID (MDADM, MDRAID) can be used as an underlying storage device for StarWind Virtual SAN devices. Recommended settings for Linux Software RAID with StarWind VSAN for vSphere. NOTE: For configurations where StarWind VSAN service is running inside a virtual machine, it is recommended to passthrough RAID or HBA controller to the virtual machine. RAID 5, 50, 6 and 60 can be used for VTL devices. NOTE: It is not recommended to use RAID 0 for 2-nodes StarWind highly-available devices due to the risk of data loss. – For virtual disks having SAS disks underneath, this policy is DISABLED by default. – For virtual disks having SATA disks underneath, this policy is ENABLED by default Write policy: Write Through or Write Back, depends on the configurationĭisk Cache Policy: when enabled, allows writing to the cache of the disk prior to the medium RAID type: RAID 1 for 2x SSDs RAID 5 for 3x and more SSDs, or RAID 10 for 4x and more pair SSDĭisk cache policy: Default (enabled by default) Recommended settings for hardware RAID arrays based on SSD: Recommended settings for hardware RAID arrays based on HDD:ĭisk cache policy: Default (disabled by default) Even SSD disks in a RAID array can demonstrate results similar to the HDD arrays in case of using wrong RAID controller settings. The RAID controller settings are very important and with different settings used the results may vary greatly.
One of the ways to speed up the storage for read/write operations and get better reliability is using RAID arrays. StarWind Virtual Tape Library (VTL) OEMĬhoosing and preparing the type of underlying storage is one of the most important steps in production environment virtualization.StarWind Virtual Tape Library Appliance (VTLA).StarWind HyperConverged Appliance (HCA).StarWind RDMA Performance Benchmark (rPerf).
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