raid 0+1 Q..

[SinNisTeR]

if i have a raid 0+1 with 3 hds.. i have the have the hd that will be doing the 1 be the size of the two 0's combined right?

 

[ShadowFox]

you mean raid 5 right?

 

[GoSharks]

dont think you can do that.

you are going to need 4 hard drives for 0+1, becuase (correct me if im wrong, but i dont think so) what you are doing is making 2 raid 0 arrays and then making a raid 1 array out of the two raid 0s.

 

[GoSharks]

<< you mean raid 5 right? >>



raid 5 you only need 3 disks of the same size.

 

[cleverhandle]

Someone around here did recently say that some controllers, at least, are able to run 0+1 when the third (mirror) drive is at least the size of the striped array. Hope it's true - would be pretty funky cool.

 

[Goosemaster]

Usually Raid 0 makes two harddrives into one if I am not mistaken. Basically you will see one HD that "should" the eqivalent of a drive "twice" as fast as the originals. the sarcasm is based on real-world tests that show that you never really get "twice the speed" in day to day operations

Here is an example:

-Raid 0
-2 40GBs

You will end up with 80GBs, but half of the data will go to EACH drive, so in effect each drive processes less, making hte overall experience a LITTLE quicker(unfortunately due to slower access times on IDE HDs, the velocity that should be seen for small file trasfers(OS Stuff) is not there


-RAID 1
-2 40GBs

Again you end up with 40GBs but the data is backed up on the other HD in case of HARDWAREFAILURE. Just because you have a backup does NOT mean system related failure will not matter..both drives are written to simultaneously.


You can join these two, but you might need 4 drives to get perfection. WHy? because both of the raid 0 drives combined will be faster than the single drive for RAid 1. Basically the system would be slowed down waiting to write from the backup drive that the whole RAID 0 idea would be useless.

I have done it through software on one of my WIn2k ADV server machines abnd it works great.


By the way, if anyone sees errors, point them out so i can correct them


by the way, a RAID 0 array can kill cockaraoches.......SMASH 'EM WITH IT!!!😀:disgust:🙁😉😀


EDIT: EDITED FOR IDIODIC COMMENTS UNBECOMING A MAN OF MY HURCULEAN STATURE

 

[GoSharks]

<<
-Raid 0
-2 40GBs

You will end up with 40GBs, but half of the data will go to EACH drive >>



no... you would end up with 80GB

 

[Goosemaster]

<< <<
-Raid 0
-2 40GBs

You will end up with 40GBs, but half of the data will go to EACH drive >>



no... you would end up with 80GB >>



my bad then..for some reason i fogot i forget that......

 

[ChrisIsBored]

<< you are going to need 4 hard drives for 0+1, becuase (correct me if im wrong, but i dont think so) what you are doing is making 2 raid 0 arrays and then making a raid 1 array out of the two raid 0s.
>>