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Old 11-03-2007, 03:05 AM   #1
Tahir Saleh
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RAID like implementation on a single disk


is there anyway(point in general) to implement RAID on a single disk by making partitions. what iam trying to do is tat iam implementing RAID for testing purposes meanwhile and afterwaeds ill go on purchasing a new disks to implement RAID6. so is there a way....plz respond.
 
Old 11-03-2007, 03:31 AM   #2
Disillusionist
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Generally I would say that you cannot create a RAID set with only one hard disk.

Having said that I reconsidered.

If you have virtualisation software (example VMWare Server) you can create multiple virtual disk files on the host machines single disk and can try to create a RAID on a guest operating system.

This would only be worth doing as a training exercise (if then)

Additionally (apart from not protecting against a single drive failure) you will suffer performance issues as the "RAID set" is using the same physical disk and therefore your disk head is going to be very busy.


I have not tried this myself and do not guarantee success.

Last edited by Disillusionist; 11-03-2007 at 03:32 AM.
 
Old 11-03-2007, 04:07 AM   #3
Tahir Saleh
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thanks for the respond Disillusionist.
i will reconsider wat i was going to do.
 
Old 11-03-2007, 08:03 AM   #4
brianmcgee
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Actually you will configure Raid on single disks in most Linux class rooms for test purposes.

You will not get a productive functionality but you could train the usage of the raid toolset.
 
Old 11-03-2007, 08:26 AM   #5
Disillusionist
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Wouldn't that classify as a training exercise?
 
Old 11-03-2007, 10:15 AM   #6
complich8
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mdadm will let you create arbitrary raid types out of arbitrary member partitions.

It's not entirely uncommon to have several disks (say, 4 drives) that have a couple partitions each, with each partition participating in some different sort of raid (eg: raid-1 across 4 disks for the really really important stuff, raid5 for the fairly important stuff, raid0 for the performance-sensitive but otherwise unimportant stuff ...).

Similarly, it's not at all uncommon to do exactly what you're doing, and mdadm supports just that precisely for that purpose.
 
Old 11-05-2007, 06:28 AM   #7
Tahir Saleh
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thanks for the tips all.guess i will have to wait for the new disks to be bought till i implement raid6 meanwhile i maybe test raid by tat virtualisation software.

Last edited by Tahir Saleh; 11-05-2007 at 06:31 AM.
 
Old 11-06-2007, 06:44 AM   #8
Tahir Saleh
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ok now i have one new drive, can raid be implemented on linux installation disk and a separate new disk?
 
  


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