Use of SSDs in a cache pool extends this benefit even further. Given the desire for fast-as-you responsiveness in application and machine performance, using the cache pool for virtual machine/application storage is a no-brainer. Virtual machines and applications can have their data reside on the cache pool permanently for overall improved performance, while keeping mass-storage content on the array still accessible to those virtual instances using VirtFS (for KVM Virtual Machines) and Docker (for Containers).
#Unraid change disk number Pc
VM performance benefits on an SSD are comparable to what a user would experience with them on a desktop PC vs. SSDs are most ideal for supporting virtual machines. When used for storing large quantities of smaller files (e.g., metadata), SSDs can provide a faster response time for these files to the application compared to spinning hard disks and They are also smaller, so you can fit more of them into a smaller space for highly compact, crazy fast storage. They do not require time to spin up or consume a lot of power to operate (they are fast and efficient) UnRAID now has native support for TRIM, which can substantially reduce the number of write operations when used as a cache device. You can simply change the device when convenient.Īdd more devices of different sizes to your pool as you need to and grow on-demand. No need to drop everything to deal with a system outage. If a cache pool device fails, the system will continue to operate as normal. With a cache pool, however, all write operations are replicated across two separate disks to ensure that the loss of any one drive in the pool does not result in data loss. With a single cache device, theres a possibility that you can lose your data if the device fails before the data gets moved to the array. The unRAID cache pool is created through a unique twist on traditional RAID 1. The grouping of multiple devices in a cache is referred to as building a cache pool. However, you can configure a cache with multiple devices both to increase your cache capacity as well as to add protection for that data. With a single cache device, data captured there is at risk, as a parity device doesn't protect it. Once the data has been successfully copied, the space on the cache drive is once again freed up to front-end other write operations to cache-enabled user shares.
Subsequently an unRAID process called the mover copies the data from the cache to the array at time and frequency of your choosing. Because this device is not a part of the array, the write speed is unimpeded by parity calculations. When data is written to a user share that has been configured to use the cache device, all of that data is initially written directly to the dedicated cache device.
Generally speaking, by using a cache alongside an array of 3 or more devices, you can achieve up to 3x write performance. The cache drive feature of unRAID provides faster data capture. Since hard drives store data as zeroes and ones, when a drive fails the parity compares the binary data on all the surviving drives and can deduce the missing data to rebuild. While it seems mind boggling that one drive can possibly back up other drives that have way more storage capacity than the parity, it is able to reconstruct the missing data from a failed drive using binary logic called XOR (eXclusive-OR). A parity device provides a way for you to reconstruct data from a failed disk onto a new one. The primary concept behind an unRAID array is its ability to manage an aggregate of disk devices (JBOD) that is protected by a dedicated parity device. UnRAIDs storage capabilities are broken down into three components: the array, the cache, and the user share file system. In addition, by eliminating the use of traditional RAID-based technologies, we can scale on-demand by adding more disks and without needing to rebalance data. The benefit is unRAIDs ability to boot on nearly any x86 64-bit capable system and manage an array of disks that vary in size, speed, brand, and protocol. Where many competitors have focused on creating an appliance offering, unRAID has taken a hardware-agnostic approach to network-attached storage. Lime Tech unRAID Server OS 6.6.4 | Languages: English | File Size: 260.18 MB
0 kommentar(er)
