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Can we add two 300 GB Disks to existing RAID 1+0 ?

What is the best procedure to add two 300GB disks to existing RAID 1+0 on HP Proliant 320S with Smart Array P400 controller?

Do we need to reboot the server or can be configured while server running?
By adding two 300GB HD, I assume we will only get 300GB of extra space right?
 
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epichero22
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Do you know what the model number of the hard drives are?  You can look them up on this spec sheet and it will tell you if it's a hot-plug or not:

http://h18004.www1.hp.com/products/quickspecs/12400_div/12400_div.pdf

If it's not hot-plug compatible, then you will have to turn the server off, insert the hard drives, turn the server on again and possibly configure them.

If you install two more drives, then this RAID calculator says that you'll have 1.2 terabytes of drive space total.

And here's the support page for your product, in case you need it:
http://h20565.www2.hp.com/portal/site/hpsc/public/psi/home/?sp4ts.oid=3232017
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its not listed in there but we have replaced them in past as hot swappable in case anyone of them have died. The real question is we have 3 kind of arrays (2 of them as mirror and 1 as described above as Raid 1+0). As we add 2 x extra HD will we get option of reconfigure/add to existing raid?
Yes, RAID types do not have a limit on how many drives they can accommodate.  The amount of redundancy / disk space / performance will increase but you may be better off just going with a single RAID 10 across the board.
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