Re: Raid Controllers
From: Nathan McNulty (nospam_at_msn.com)
Date: 09/07/04
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Date: Tue, 07 Sep 2004 10:36:54 -0700
Thanks for catching my mistake. Typing off the top of my head again.
Random should have been Redundant.
---- Nathan McNulty BAR wrote: > Short for Redundant Array of Independent (or Inexpensive) Disks, a category > of disk drives that employ two or more drives in combination for fault > tolerance and performance. RAID disk drives are used frequently on servers > but aren't generally necessary for personal computers. > > There are number of different RAID levels: > > Level 0 -- Striped Disk Array without Fault Tolerance: Provides data > striping (spreading out blocks of each file across multiple disk drives) but > no redundancy. This improves performance without fault tolerance such that if > one drive fails then all data in the array is lost. > Level 1 -- Mirroring and Duplexing: Provides disk mirroring. Level 1 > provides twice the read transaction rate of single disks and the same write > transaction rate as single disks. > Level 2 -- Error-Correcting Coding: Not a typical implementation and rarely > used, Level 2 stripes data at the bit level rather than the block level. > Level 3 -- Bit-Interleaved Parity: Provides byte-level striping with a > dedicated parity disk. Level 3, which cannot service simultaneous multiple > requests, also is rarely used. > Level 4 -- Dedicated Parity Drive: A commonly used implementation of RAID, > Level 4 provides block-level striping (like Level 0) with a parity disk. If a > data disk fails, the parity data is used to create a replacement disk. A > disadvantage to Level 4 is that the parity disk can create write bottlenecks. > Level 5 -- Block Interleaved Distributed Parity: Provides data striping at > the byte level and also stripe error correction information. This results in > excellent performance and good fault tolerance. Level 5 is one of the most > popular implementations of RAID. > Level 6 -- Independent Data Disks with Double Parity: Provides block-level > striping with parity data distributed across all disks. > Level 0+1 – A Mirror of Stripes: Not one of the original RAID levels, two > RAID 0 stripes are created, and a RAID 1 mirror is created over them. Used > for both replicating and sharing data among disks. > Level 10 – A Stripe of Mirrors: Not one of the original RAID levels, > multiple RAID 1 mirrors are created, and a RAID 0 stripe is created over > these. > Level 7: A trademark of Storage Computer Corporation that adds caching to > Levels 3 or 4. > RAID S: EMC Corporation's proprietary striped pairty RAID system used in its > Symmetrix storage systems. > > "Nathan McNulty" wrote: > > >>If you have to ask, you shouldn't be using it. >> >>RAID is a Random Array of Independent Disks. >> >>Here is a good source of info about it: >>http://www.acnc.com/raid.html >> >>This requires more than one hard drive and you should only setup your >>computer with RAID if you understand what it is, how to set it up, and >>why you need it. >> >>---- >>Nathan McNulty >> >> >>jah711 wrote: >> >>>What exactly is the RAID Controller and what is the >>>purpose of Raid? >>>Also where is a good place to get the drivers? >>>My specs: >>>Asrock P4 2.0ghz model P4VT8 >>>512Ram >>>Win XP Pro >>>e-Geforce FX 5200 nvidia 128MB Video card >>>Thanks. >>>. >>> >>> >>
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