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What is raid, What does it do ? do i need it ?

post #1 of 13
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I may be a bit stupid with this question but even never used it so need to know,
What is raid and What does it do ?
do i need it ?
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Primo Power
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post #2 of 13
RAID is a way of combining hard drives. The most common type of RAID is RAID 0 and RAID 1. RAID 0 is combining two hard drives so they appear as one, and causing files to be written closer to the outside of the disk thus having faster read/write times. RAID 1 is for backup, splitting files so parts of them are on both hard drives to have some sort of backup if one of them fails. And then there are a bunch of other RAID's like RAID 1+0, RAID 3, RAID 5.

If you need lots of space and speed do RAID. If not get a SSD, install windows and maybe a few games on it, and the rest on a tradition hdd.
    
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post #3 of 13
Quote:
Originally Posted by Speedma11229 View Post
RAID is a way of combining hard drives. The most common type of RAID is RAID 0 and RAID 1. RAID 0 is combining two hard drives so they appear as one, and causing files to be written closer to the outside of the disk thus having faster read/write times. RAID 1 is for backup, splitting files so parts of them are on both hard drives to have some sort of backup if one of them fails. And then there are a bunch of other RAID's like RAID 1+0, RAID 3, RAID 5.
RAID0 is not "causing files to be written closer to the outside of the disk thus having faster read/write times." RAID0 distributes files to sectors on alternating disks to improve performance at the risk of data loss if any drive fails.

RAID1 is not "splitting files so parts of them are on both hard drives to have some sort of backup if one of them fails." RAID1 mirrors files so all disks contain the same data in a case one fails.


RAID are different techniques of utilizing multiple storage drives to improve performance and/or redundancy.

Read here: http://www.acnc.com/raid.html
Edited by DuckieHo - 1/8/11 at 10:35am
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post #4 of 13
Quote:
Originally Posted by DuckieHo View Post
RAID0 is not "causing files to be written closer to the outside of the disk thus having faster read/write times." RAID0 distributes files to sectors on alternating disks to improve performance at the risk of data loss if any drive fails.

RAID1 is not "splitting files so parts of them are on both hard drives to have some sort of backup if one of them fails." RAID1 mirrors files so all disks contain the same data in a case one fails.


RAID are different techniques of utilizing multiple storage drives to improve performance and/or redundancy.

Read here: http://www.acnc.com/raid.html
I stand corrected, but speed and backup are the reasons people do RAID.
    
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post #5 of 13
Quote:
Originally Posted by Speedma11229 View Post
I stand corrected, but speed and backup are the reasons people do RAID.
Absolutely, for speed it's RAID0. For backup protection, it's RAID1.
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post #6 of 13
Quote:
Originally Posted by Speedma11229 View Post
I stand corrected, but speed and backup are the reasons people do RAID.

RAID is for redundancy, not backup.

Redundancy allows you to continue working in case of a failure.
Back up allows you to retrieve data in case the working copy is lost or inaccessible.
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post #7 of 13
Quote:
Originally Posted by DuckieHo View Post
RAID is for redundancy, not backup.

Redundancy allows you to continue working in case of a failure.
Back up allows you to retrieve data in case the working copy is lost or inaccessible.
Oh Duckie, you're so proper.
post #8 of 13
Quote:
Originally Posted by EfemaN View Post
Oh Duckie, you're so proper.
A lot of people make the mistake of thinking RAID is a form of backup. Then they cry when a virus or power failure takes out all their data.
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post #9 of 13
DUckie is 100% correct

Backup's are different to reduandancy. Also what you have missed out on is RAID5 which is a striped array with parity. It's like RAID0 but there is parity across the array which means you can have a failed drive and not loose any data. This is the most cost effective solution since you get the most storage space for your drives.

Comps
post #10 of 13
This is very interesting stuff to learn here. So here's a dumb question about Raid 0. If you can get faster performance with two drives, why not four drives to alternate the data?
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