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OS: Debian stretch, motherboard: ASUS H87I-PLUS.

I am trying to setup bootable hardware RAID1. Through motherboard menu I've created array of two drives (sdd and sde). This array is recognized by linux as md126.

Then I partitioned it into md126p1 (primary 1G, to use as /boot), md126p2 (extended) and md126p5 (secondary, lvm pv, to use as /root). Then I created volume group n using single pv on md126p5.

Now for some reason system sees partition table on md126 twice: as partitions of md126 and as partitions of sdd, so I get duplicate pv error:

WARNING: PV pcmcX0-vMQ3-z7Wq-cGpZ-5YrZ-0g8o-07xp5H on /dev/sdd5
was already found on /dev/md126p5.
WARNING: PV pcmcX0-vMQ3-z7Wq-cGpZ-5YrZ-0g8o-07xp5H prefers device
/dev/md126p5 because device is used by LV.

and lsblk /dev/sdd shows this:

sdd                      8:48   0 931.5G  0 disk  
├─sdd1                   8:49   0     1G  0 part  
├─sdd2                   8:50   0     1K  0 part  
├─sdd5                   8:53   0 930.5G  0 part  
└─md126                  9:126  0 931.5G  0 raid1 
  ├─md126p1            259:0    0     1G  0 md    
  ├─md126p2            259:1    0     1K  0 md    
  └─md126p5            259:2    0 930.5G  0 md    
    └─n-root           253:4    0  29.6G  0 lvm

Also because of this grub refuses to boot from this new array (current system boots from sda).

Is it normal that partitions appear twice and how to fix it?

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    Instead of making a RAID from whole disks and partitioning md126, partition each disk and RAID the partitions individually.
    – Michael Hampton
    Oct 19, 2018 at 17:38
  • bootable hardware RAID1 and This array is recognized by linux as md126 doesn't sound like hardware RAID at all. Hardware RAID should present a one drive to the OS that looks like one drive, and it shouldn't show up as an md device. A true hardware RAID controller would present an "normal" sd device. Does mdadm show it as a software RAID device?
    – Andrew Henle
    Oct 19, 2018 at 18:13
  • @AndrewHenle suprised me too, but i thought linux interfaced with hw raid somehow. Which command tells me what raid it is?
    – Oborvanec
    Oct 19, 2018 at 18:45
  • @MichaelHampton I wanted hw raid, and raid setup (ctrl-i during boot after uefi), only allowed to choose whole hdds, not partitions.
    – Oborvanec
    Oct 19, 2018 at 18:46
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    OK, so it's a fakeraid. Probably best to just ignore its existence and set up the software RAID partitions yourself with mdadm.
    – Michael Hampton
    Oct 19, 2018 at 18:52

1 Answer 1

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Turned out it's a "fake RAID", and has several drawbacks. I've switched to software RAID so I won't be figuring this out.

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