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I have a HP Proliant DL380 G5 with two HDDs in RAID 0 (Stripe)(72GB+72GB). It has been running Windows Server for quite a while now and has 30GB of occupied space on a stripted volume.

I've now purchase two 72GB HDDs more (same as the one's already installed in the server). I'd like to make that system more safe by introducing HDD mirroring of the existing striped disk.

  1. Is it possible to create a RAID 1 (mirror) on a disk that has already been in use?
  2. Is it possible to mirror a striped disk pair?

Thanks in advance.

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up vote 5 down vote accepted

Yes, this is possible.

See: Can I convert a 1 disk RAID 0 to RAID 1?

You're lucky that your striped array has worked until now. The process you'll go through is an "array transformation".

  • Make sure your system has a battery-backed cache (BBWC) on the RAID controller.
  • Add two more disks of equal or greater size than the existing disks.
  • Install the HP Smart Storage Administrator (HPSSA) software for Windows (or the HP Array Configuration Utility is this is an old version of Windows).
  • In the software, add the two new drives to the existing array.
  • In the software, perform an array transformation from RAID0 to RAID 1+0.
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I'd like to hear the results from this. – Mark Wagner Mar 30 '14 at 17:21
@mark it works quite well, with the only stipulation being that the BBWC unit is healthy and present. – ewwhite Mar 30 '14 at 17:58
I will try that tomorrow and will let everyone interested know how it went here in the comment. – Maxim V. Pavlov Mar 30 '14 at 18:54
Yep, it worked. HP tool that I put on flash and booted from worked like a charm providing UI with a mouse and a very intuitive interface. Selected change array, added two other drives and selected to transform into a 1+0 RAID. 3 hrs of transformation and bing - everything works. – Maxim V. Pavlov Apr 27 '14 at 15:21

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