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RAID question

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by jlbpotter Nov 18, 2002 last reply Nov 18, 2002

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How much of your HDDs does RAID 5 usually use. I have RAID 5 configured on (3) 36 GB Ultra SCSI HDDs. That equals about 108 GB. In disk management I see about 68 GB. Is this normal. I am running windows 2000 server. Thanks

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by thechas Nov 18, 2002

For RAID 5, that looks to be correct.

Basically, you loose 1 drives capacity in each RAID 5 array.
So, if you added a 4th drive, your capacity would increase to 108GB.

The extra capacity is used for the parity bits.

Here is a link with more detail.

http://www.pcguide.com/ref/hdd/perf/raid/levels/multLevel05-c.html

Chas

by jlbpotter Nov 18, 2002

Thanks for the link.

by jlbpotter Nov 18, 2002

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