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I have HP DL360p Gen8 8 with internal 420i controler and FBWC + battery. ACU says that raid level is 1+0. But in details of the controler i've found:

     Mirror Group 0:
        physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 500 GB, OK)
        physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 500 GB, OK)
        physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SAS, 500 GB, OK)
     Mirror Group 1:
        physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SAS, 500 GB, OK)
        physicaldrive 2I:1:5 (port 2I:box 1:bay 5, SAS, 500 GB, OK)
        physicaldrive 2I:1:6 (port 2I:box 1:bay 6, SAS, 500 GB, OK)
     Drive Type: Data

which is raid 0+1 level. Is there any option to transform this RAID to level 1+0 without data lose? Offline or online - it doesn't matter.

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up vote 1 down vote accepted

You're reading the hpacucli array configuration output incorrectly.

This is displaying two groups of disks, Mirror Group 0 and Mirror Group 1. Each member of each mirror group has a partner in the other mirror group.


physicaldrive 1I:1:1 pairs to physicaldrive 1I:1:4 
physicaldrive 1I:1:2 pairs to physicaldrive 2I:1:5
physicaldrive 1I:1:3 pairs to physicaldrive 2I:1:6 

HP Smart Array controllers don't allow or even provide a method of configuring RAID 0+1.

Honestly, I always try to balance drives across SAS SFF-8087 connectors. In this case, that would mean populating bays 1, 2, 3 and 5, 6, 7... That would allow the unlikely failure of a SFF-8087 SAS port or cable such that it would only affect one side of the mirror (or Mirror Group).

Also see: 6 Disk Raid 1+0

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Heh, that realy make sense now. Thanks. – smaj Mar 4 '13 at 19:05

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