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Answered 2011-05-30 00:47:47

RAID 5 setups allow for getting the most storage out of an array of disks without loosing parity, or redundancy. For example.

Raid 5 array with four disks will have the capacity of three of those disks using the forth's pool of storage (over all the disks) as a parity bit so if one of the disks were to fail you would simply swap out the defective disk and the array will rebuild itself in an ideal world.

Because of this write speeds on RAID 5 arrays tend to be a bit slower then other arrays because it's spreading out it's data on however many disks you have any it's writing parity bits at the same time. Read speeds tend to be quick on RAID 5 making it ideal for archival use or data that must be read a lot but not edited much or changed. Think of a server dishing up programs to users or storing their finished work files.

Hope that helps!

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My understanding of RAID 5 is that you must have a minimum of 3, but the maximum is only limited by your RAID controller.

A minimum of 3 disk drives for Raid-5 volume

Essentially that just means understanding what raid one and raid 5 are. Raid one stores the data on 2 hard disks, raid 5 stores the data on 3 to 5 disks. In either of these circumstances all the hard disks must be completely identical right down to brand cache, size etc.

For Raid 5 all the hard drives have to be of the same speed.

Every RAID level stripes data across multiple drives, which improves performance compared to using a single disk. RAID 0, RAID 1, RAID 1+0, RAID 5, RAID 6, etc. all have better performance than a single disk. Other than RAID 0, all other RAID levels provide fault tolerance. RAID 1, RAID 1+0, RAID 5, RAID 6, etc. all have fault tolerance.

RAID controllers have a wide variety of benefits which apply to the cloud computing community. RAID essentially improves performance for programmers that need to compute various codes.

Every RAID level stripes data across multiple drives, which improves performance compared to using a single disk -- RAID 0, RAID 1, RAID 1+0, RAID 5, RAID 6, etc.

RAID 1 = Disk Mirroring. Two redundant disks with identical information acting as one disk. RAID 5 = Disk striping with parity. Data is spread across 3 or more disks with parity information for error correction and recovery.

Vikings - 2013 Raid 1-5 is rated/received certificates of: Netherlands:16 USA:TV-14

The minimum number of harddrives for a fully functional raid 5 system is 4 hard drives.

RAID 1 OR RAID 5 provide added performance as well as fault tolerance --- GAURAV TOMAR

A RAID 5 uses block -level striping with parity data distributed across all member disks. RAID 5 has achieved popularity due to its low cost of redundancy. This can be seen by comparing the number of drives needed to achieve a given capacity. RAID 1 or RAID 0+1, which yield redundancy, give only s / 2 storage capacity, where s is the sum of the capacities of n drives used. In RAID 5, the yield is . As an example, four 1TB drives can be made into a 2 TB redundant array under RAID 1 or RAID 1+0, but the same four drives can be used to build a 3 TB array under RAID 5. Although RAID 5 is commonly implemented in a disk controller, some with hardware support for parity calculations (hardware RAID cards) and some using the main system processor (motherboard based RAID controllers), it can also be done at the operating system level, e.g., using Windows Dynamic Disks or with mdam in Linux. A minimum of three disks is required for a complete RAID 5 configuration. In some implementations a degraded RAID 5 disk set can be made (three disk set of which only two are online), while mdadm supports a fully-functional (non-degraded) RAID 5 setup with two disks - which function as a slow RAID-1, but can be expanded with further volumes. In the example on the right, a read request for block A1 would be serviced by disk 0. A simultaneous read request for block B1 would have to wait, but a read request for B2 could be serviced concurrently by disk 1.

Raid level 5 supports reading and writing, but writing performance is slower than raid levels 0 and 1.Raid level 5 requires a minimum of 3 drives.

The Rat Patrol - 1966 The Chain of Death Raid 1-5 was released on: USA: 10 October 1966

Dark Age - 2013 The Raid Part 2 1-5 was released on: USA: 30 March 2013

RAID 0 is the best for speed because it uses "data stripping". That means if one drive fails, all you have left on the other one is useless bits and pieces of your files. That means one drive failing will corrupt ALL your data. If you choose RAID 0, you MUST back up your data at the very least every day. Preferably every hour. Automatic back ups is a good idea anyway. RAID 1 uses "mirroring". When you save a file, it gets saved to BOTH drives. Putting drives in RAID 1 does not make the system faster. That means if one drive fails, the other one will still contain all your data. The problem with RAID 1 is that you only get HALF of the space you bought. For example, if you put 2 drives with a 3TB capacity in RAID 0, you would have 6TB. 2 drives with 3TB each in RAID 1 would mean instead of 6TB, you would only have 3TB. The reason for that is because both drives contain the EXACT same data. RAID 5 is pretty good for speed and if 1 drive fails, you can just replace it and rebuild the RAID 5 array without losing any data. RAID 5: RAID 1: RAID 0: I would create a RAID 0 array to store your files and if you care about any of the files you would store on your computer, a RAID 1 or RAID 5 array (I would recommend RAID 5) to back up your data to. I hope this helps.

"The most common software implementation of RAID is the built-in RAID software that comes with Windows 2000, 2003, and 2008 Server." ~Mike Myers CompTIA A+ Guide to Managing and Troubleshooting PC's Third Edition~

The Rat Patrol - 1966 The Chain of Death Raid 1-5 is rated/received certificates of: Canada:PG (video rating)

There are three types of RAID RAID 0 (Stripping without parity) The records are distributed among all the available HDDs. The number of the HDDs may vary from one system to the other RAID 1 (Mirroring) This uses double number of HDDs. One stores the records while an equal number of HDDs forms the backup. RAID 5 (Stripping with parity) This type of raid distributes the records in n-1 disks while maintaining 1 disk as the parity disk. assuming 4 HDDs are required RAID 0 uses all the four RAID 1 uses double RAID 5 uses 4 + 1

The Rat Patrol - 1966 The Love Thine Enemy Raid 2-5 is rated/received certificates of: Canada:PG (video rating)

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