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Old 12-30-2005, 02:12 AM   #1
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Default raid strip

wat is it? like i kno wat RAID is, but wat are strips.
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Old 12-30-2005, 02:37 AM   #2
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Default Re: raid strip

You mean data stripping? Ok....

RAID (Redundant Array of Independent Disks) A disk subsystem that is used to increase performance or provide fault tolerance or both. RAID uses two or more ordinary hard disks and a RAID disk controller. In the past, RAID has also been implemented via software only.

In the late 1980s, the term stood for "redundant array of inexpensive disks," being compared to large, expensive disks at the time. As hard disks became cheaper, the RAID Advisory Board changed "inexpensive" to "independent."

Small and Large

RAID subsystems come in all sizes from desktop units to floor-standing models. Stand-alone units may include large amounts of cache as well as redundant power supplies. Initially used with servers, desktop PCs are increasingly being retrofitted by adding a RAID controller and extra IDE or SCSI disks. Newer motherboards often have RAID controllers.

Disk Striping

RAID improves performance by disk striping, which interleaves bytes or groups of bytes across multiple drives, so more than one disk is reading and writing simultaneously.

Mirroring and Parity

Fault tolerance is achieved by mirroring or parity. Mirroring is 100% duplication of the data on two drives (RAID 1). Parity is used to calculate the data in two drives and store the results on a third (RAID 3 or 5). After a failed drive is replaced, the RAID controller automatically rebuilds the lost data from the other two. RAID systems may have a spare drive (hot spare) ready and waiting to be the replacement for a drive that fails.

The parity calculation is performed in the following manner: a bit from drive 1 is XOR'd with a bit from drive 2, and the result bit is stored on drive 3.

RAID Levels



RAID 0 - Speed

Level 0 is disk striping only, which interleaves data across multiple disks for better performance. It does not provide safeguards against failure. RAID 0 is widely used in gaming machines for higher speed.

RAID 1 - Fault Tolerance

Uses disk mirroring, which provides 100% duplication of data. Offers highest reliability, but doubles storage cost. RAID 1 is widely used in business applications.

I hope this helps.
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Old 12-30-2005, 03:41 AM   #3
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Default Re: raid strip

so the size of the strip is... what? i think i get it but can someone tell me.? please and thank you.
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Old 12-30-2005, 03:44 AM   #4
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Default Re: raid strip

The size of the strip? What? I'm a little confused... the size of the strip if whatever the size of the data is... to my understanding that is... somebody correct me if I'm wrong...
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Old 12-30-2005, 03:49 AM   #5
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Default Re: raid strip

oh, um, i think i heard something wrong before then. my bad. thanks for the help tho.
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Old 12-30-2005, 03:50 AM   #6
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Default Re: raid strip

oh another question... wat is sataII(2)? is that the one thats 3.0Gb/s and wat is sata150? is that 1.5Gb/s?
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Old 12-30-2005, 03:52 AM   #7
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Default Re: raid strip

ok, heres where i got confused...

http://www.newegg.com/Product/Produc...82E16822145082

its in the first comment. he talked about stripes



oh and if a mobo supports sata2, does it support sata1?
-and wat are those types?
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Old 12-30-2005, 03:53 AM   #8
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Default Re: raid strip

Quote:
Originally Posted by badninja3
oh another question... wat is sataII(2)? is that the one thats 3.0Gb/s and wat is sata150? is that 1.5Gb/s?
A serial version of the ATA (IDE) interface, which has been parallel since its inception in 1986. Ratified by ANSI in 2002 as the next-generation ATA technology, Serial ATA (SATA) provides a point-to-point channel between motherboard and drive rather than the Parallel ATA (PATA) master-slave architecture that supports two drives on the same cable.

Serial ATA (SATA) transfers data in a half-duplex channel at 1.5 Gbps (150 MBps) in one direction. With SATA II, introduced in 2003, speed was increased to 3 Gbps (300 MBps).

Smaller Cables and Connectors

SATA uses a four-wire cable up to one meter in length compared to the 18" wide, flat cable used with PATA drives. The cables and connectors are considerably smaller than their PATA counterpart and take up a lot less space in the case.

Hope this helps...
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Old 12-30-2005, 03:56 AM   #9
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Default Re: raid strip

alright, cool thanks. so like if a mobo supports sataII, then can it support sataI?
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Old 12-30-2005, 04:01 AM   #10
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Default Re: raid strip

try these articles...
http://anandtech.com/storage/showdoc.aspx?i=2450
http://anandtech.com/storage/showdoc.aspx?i=2454
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