What Is Raid
- Thread starter geowal19
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you use multiple hard drives and each raid does something different
raid 0 - if u use 2 x 320gb drives you will have 320gb usable space. raid 0 increases the read/write times
raid 1 - i believe this is where 1 drive mirrors the other?
raid 0 - if u use 2 x 320gb drives you will have 320gb usable space. raid 0 increases the read/write times
raid 1 - i believe this is where 1 drive mirrors the other?
Associate
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Raid 1 would mean you'd have 320GB space if you were using 2 x 320GB drives.
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So why would you want a hard-drive that does no storage?
If it increases speed, can't you just get a 20gb disk instead of a 320gb to save money but have the same speed effect?
If it increases speed, can't you just get a 20gb disk instead of a 320gb to save money but have the same speed effect?
Perfect, instantanious backup. Mirroring.
no becuase bigger drives have a bigger platter so more data can be accessed faster.
You mean a more condensed platter, so seek times are lower.
/Strokes 6-disk RAID-5 array.
, ive got a spare pare of ear defenders if you need them 
Soldato
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RAID = redundant array of inexpensive disks
0 = where data is striped across more than one disk. no protection against failure. if you lose one disk you lose all the data on all the disks.
1 = data is mirrored onto an identical disk. data can be read from either one which improves read times but as data has to be written twice, data writes can be degraded. full protection against drive failure.
2,3,4 rarely used. ignore.
5 = data is striped across multiple (minimum of 3) drives with part of each drive used to store parity data enabling the array to continue to work in the event of a drive failing. The amount of data space available is the combined storage of the identical drives minus the space of one of them. the most effective in terms of data space but requires dedicated xor chips to handle the parity data and striping. many motherboards which offer RAID 5 do it in software which puts a considerable strain on the cpu.
0 = where data is striped across more than one disk. no protection against failure. if you lose one disk you lose all the data on all the disks.
1 = data is mirrored onto an identical disk. data can be read from either one which improves read times but as data has to be written twice, data writes can be degraded. full protection against drive failure.
2,3,4 rarely used. ignore.
5 = data is striped across multiple (minimum of 3) drives with part of each drive used to store parity data enabling the array to continue to work in the event of a drive failing. The amount of data space available is the combined storage of the identical drives minus the space of one of them. the most effective in terms of data space but requires dedicated xor chips to handle the parity data and striping. many motherboards which offer RAID 5 do it in software which puts a considerable strain on the cpu.
Technically, both are now considered correct.
Yeah, my Q6600 really does hate the 3% max load that disk access gives me. Such a strain.
Yeah, my Q6600 really does hate the 3% max load that disk access gives me. Such a strain.
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Soldato
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RAID absolutely stands for inexpensive. If you care to read the original paper RAID is a response to the existing technology which was known as a SLED = Single Large Expensive Disk. If you do not believe me, go read the original paper.
A Case for Redundant Arrays of Inexpensive Disks by David Patterson, Garth Gibson and Randy Katz.
- http://pcguide.com./ref/hdd/perf/raid/index.htm
- http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks#cite_note-0
A Case for Redundant Arrays of Inexpensive Disks by David Patterson, Garth Gibson and Randy Katz.
Soldato
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Try software RAID-5 on a fileserver with hundreds of users.
Buy two HDDs, connect them to an interface that supports RAID, then configure them as such with the in-built RAID software.
Oh, and aren't we forgetting JBOD?
("Just a Bunch Of Disks" - I love humourous geeky acronyms
)
Oh, and aren't we forgetting JBOD?
("Just a Bunch Of Disks" - I love humourous geeky acronyms
)
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