whats going on? RAID setup incorrectly?

490 Views 9 Replies 3 Participants Last post by catalyst, Dec 8, 2009

catalyst

Discussion Starter · Dec 7, 2009

hey guys, quick question......
i was trying to set up a RAID 0 on my 2 500GB F3`s.
RAID 0 should equal <500Gb useable space correct?

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no,

RAID0 is striped data across a set of disks without parity.

What this means is you'll get one logical volume from multiple physical drives. There is no disk space loss.

If you were to run a raid5 array you would get a loss of space for parity

Or a Raid1 array which is a mirror, you'll loose a disk.

Regards

Comps

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catalyst

Discussion Starter · #3 · Dec 7, 2009

ok, so from the screenshoot, hdtune reads 2+0 stripe/ RAID 0 etc....
what does the 2+0 mean?

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compuman145

· #4 · Dec 7, 2009

I would say 2disks in a raid 0 array.

I've not used HD tune.

What is it you're trying to achieve here? Data redundancy? Mirroring of your hard drive? Or performance?

Thanks

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catalyst

Discussion Starter · #5 · Dec 7, 2009

i was looking to set up for performance

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compuman145

· #6 · Dec 7, 2009

In which case you've achieved that, here is a small breakdown of RAID for you

RAID0 - Striped drives with no parity (you loose one disk, you loose the array)
RAID1 - Mirrored drives, normally used for system partitions
RAID5 - Striped drive with parity (you can loose a disk in the array and the remaining 2 can rebuild the failed drive)
RAID 0+1 - Striped data with mirrored drives (you're looking at a minimum of 4 disks, normally 6 you can lose a maximum of 3 drives in a 6 drive array)

Raid0 is what you want for performance, there is no parity so no disk space loss, performance is improved from pulling data from 2 channels/drives, however failure rate of array is increased (roughly increases the failure rate by 9.75%)

Regards,

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catalyst

Discussion Starter · #7 · Dec 7, 2009

ok mate, i understand now. thanks a lot!

rep+

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compuman145

· #8 · Dec 7, 2009

Quote:

Originally Posted by catalyst

ok mate, i understand now. thanks a lot!

rep+

Don't do it for the rep, I do it cause I love it

If ya need a hand with anything else then drop me a PM.

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Shub

· #9 · Dec 7, 2009

Just to add some info, in terms of available disk space depending on the RAID level you use:
RAID 0: you get the total space provided by the two drives, e.g. with two 500 GB drives you would get a ~1 TB volume.
RAID 1: you get the capacity of exactly one drive in your RAID array exactly as if you had only one drive (2x 500 GB drives will give you 500 GB of available space). If you're using drives of different sizes, the size of your volume will be that of the smallest drive in your array.
RAID 5: you get the capacity of your smallest drive times however many drives you have minus one
There are other RAID levels but they are far less common in consumer solutions so I won't get into those

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catalyst

Discussion Starter · #10 · Dec 8, 2009

ok mate, thanks a lot.
are the numbers in getting from hd tune ok? the access time and the data transfer rates seem low......compared to a single F3

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