Linux finally has an impressive cloud-like OS in Ubuntu Web. Best Raspberry Pi accessories and alternatives for Comment and share: RAID 50 offers a balance of performance, storage capacity, and data integrity. Show Comments. Hide Comments. My Profile Log out. Join Discussion. Take two or more disks and connect them like they are a single large disk.
If any of the disks fail, you loose everything on all the disks. Take two disks and that are being written to with the same information at the same time… like a mirror image, so if one fails, you loose nothing. If you swap out the failed disk for a new disk, the RAID controller will calculate all of the missing data and write it to the new disk. For any organization, whether it be small business or a data center, lost data means lost business.
There are two common practices for protecting that data: backups protecting your data against total system failure, viruses, corruption, etc.
Both are necessary to ensure your data is secure. This white paper discusses the various types of RAID configurations available, their uses, and how they should be implemented into data servers. All organizations and users should always have a solid backup strategy in place. The RAID controller handles the combining of drives into these different configurations to maximize performance, capacity, redundancy safety and cost to suit the user needs.
RAID can be hardware-based or software-based. The controller handles all RAID functions in its own hardware processor and memory.
The server CPU is not loaded with storage workload so it can concentrate on handling the software requirements of the server operating system and applications. In hardware RAID, a RAID controller has a processor, memory and multiple drive connectors that allow drives to be attached either directly to the controller, or placed in hot-swap backplanes. In both cases, the RAID system combines the individual drives into one logical disk.
The OS treats the drive like any other drive in the computer — it does not know the difference between a single drive connected to a motherboard or a RAID array being presented by the RAID controller. Given its performance benefits and flexibility, hardware RAID is better suited for the typical modern server system.
Storage manufacturers offer many models of drives. There is a big difference: a consumer drive is not designed for the demands of being connected into a group of drives and is not suitable for RAID.
To the RAID controller they are all drives, but it is important to take note of the performance characteristics of the RAID controller to ensure it is capable of fully accommodating the performance capabilities of the SSD. Compared to HDD-only RAID arrays, hybrid arrays accelerate IOPs and reduce latency, allowing any server system to host more users and perform more transactions per second on each server, which reduces the number of servers required to support any given workload.
A simple glance at Hybrid RAID functionality does not readily show its common use cases, which include creating simple mirrors in workstations through to high-performance read-intensive applications in the small to medium business arena.
Hybrid RAID is also used extensively in the data center to provide greater capacity in storage servers while providing fast boot for those servers. Any server or high-end workstation, and any computer system where constant uptime is required, is a suitable candidate for RAID. At some point in the life of a server, at least one drive will fail.
With a RAID controller in the system, a failed drive can simply be replaced and the RAID controller will automatically rebuild the missing data from the rest of the drives onto the newlyinserted drive. This means that your system can survive a drive failure without the complex and long-winded task of restoring data from backups. There is no one-size-fits all approach to RAID because focus on one factor typically comes at the expense of another. Other RAID levels focus on performance but not on redundancy.
A large, fast, highly redundant array will be expensive. With that in mind, here is a look at the different RAID levels and how they may meet your requirements. This configuration offers low cost and maximum performance, but no data protection — a single drive failure results in total data loss. As such, RAID 0 is not recommended. Generally speaking, RAID 0 is not recommended. RAID 1 maintains duplicate sets of all data on two separate drives while showing just one set of data as a logical disk Figure 3.
RAID 1 is about protection, not performance or capacity. While this may give sufficient capacity for many small business servers, performance will still be limited by the fact that it only has two spindles operating within the array. Therefore it is recommended to move to RAID arrays that utilize more spinning media when such capacities are required.
Data written in a stripe on one drive is mirrored to a stripe on the next drive in the array. For scenarios with four or more drives, RAID 10 is recommended. In the event of a single drive failure, the system reads the parity data from the working drives to rebuild the data blocks that were lost.
RAID 5 read performance is comparable to that of RAID 0, but there is a penalty for writes since the system must write both the data block and the parity data before the operation is complete. The RAID parity requires one drive capacity per RAID set, so usable capacity will always be one drive less than the total number of drives in the configuration. Usage: Often used in fileservers, general storage servers, backup servers, streaming data, and other environments that call for good performance but best value for the money.
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