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Help With Raid 5 creation from existing drives

Gnoel
Gnoel used Ask the Experts™
on
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

Commented:
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
Commented:
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

Commented:
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.

Author

Commented:
Hi

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
Commented:
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.