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Adding a drive to an array

How much does the disk storage space increase when adding an 18g drive to an array of three 18g drives?
How much disk storage do I have now with three 18g drives?
I use SCO Unix 5.0.6 with Raid 5
Is it better to add the drive as a spare if I can just get by with what I have now?

I only have 4 bays.


Thanks,
Mike
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MikeSievers
Asked:
MikeSievers
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1 Solution
 
Pete LongTechnical ConsultantCommented:
Hi MikeSievers,
adding 18Gb to an existing RAID5 array will give you 18Gb - if you can extend the array - you will only ever loose one disk to the RAID array at Level5

PeteL
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Yan_westCommented:
It will add 18g to you array. Most Raid solution provider do not recommand doing this.. They give you the mean to do it, but say they are not responsible about the result. I would put this drive as a live spare, unless you REALLY need that space.
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MikeSieversAuthor Commented:
Hmmm.  So how many drives at minimum are needed to make an array?
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Yan_westCommented:
A mirror = 2 Drive (raid 1)
A raid 5 array = 3 Drives.
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MikeSieversAuthor Commented:
Thanks.  Why don't they recommend adding a drive (not as a spare) to the array?
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Yan_westCommented:
Because it takes a 3 drive array and rebuild it as a 4 drive array. If something goes wrong, you will loose everything.
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