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Help With Raid 5 creation from existing drives

Gnoel used Ask the Experts™
need to take 2 single drive  and create a raid5. One  drive is c (bay1) the other is d drive (bay 2)need to put both drives on  a single volume HP ML 350 with e200 raid controller. bay1 is c drive bay 2 is drive need to create 1 volume raid 5 Thanks
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Top Expert 2016

to begin with only 2 drives you have drive 0 and drive 1 (mirror)  RAID 5 requires at minimum 3 drives.
Also you will lose the contents of these drives because it has to initialize the disks
Top Expert 2014
They could keep the contents of one of the drives by deleting one and then adding it as a mirror to the other, however the e200 needs battery backed write cache for RAID level migration to be enabled, even to go from 0 to 1.
David FavorFractional CTO
Distinguished Expert 2018

As David said, with 2x drives you're only RAID option is RAID1.

Expanding what andyalder said, best to always make a backup of all data before integrating drives into any RAID array, as data can sometimes be lost.



Thank you for your response

ok the e200 has 256 meg cache module installed so let me understand i have a raid o (c drive in bay1 I have a raid 0 (d drive in bay 2. in order to create a raid i just cant build a raid  in bay 3 4 5 6 and migrate the data ? sounds like after my driver restoration i have to backup once again create a new raid and image the data back is this correct ?
Top Expert 2014
Assuming your cache battery is not dead you can add one disk and migrate the OS array from RAID 0 to RAID 1 and when that is finished you can add the other three and migrate the other array from RAID 0 to RAID 5 or 10. RAID 6 is not supported. As David says it is sensible to backup first but you should not need to restore, it is very rare for RAID level migration to go wrong.

BTW, I think it is 128MB BBWC.