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Set up VROC on Generation 6 hardware

  • Published on Sep 12, 2026
  • 2 minute(s) read
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This topic explains how to set up Virtual RAID on CPU (VROC) on Generation 6 hardware where a failed drive has been replaced.

  1. Use the output from the following command to find the volume with the failed drive. Drives with [UU] are working normally, and drives with [U_UUUU] have failed. In this example, md123 is the failed drive.

    cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] 
md122 : active (auto-read-only) raid1 nvme4n1[1] nvme5n1[0]      
    937687040 blocks super external:/md125/0 [2/2] [UU]      

md123 : active raid5 nvme2n1[4] nvme7n1[3] nvme0n1[2] nvme3n1[1] nvme6n1[0]      
    31256089600 blocks super external:/md126/0 level 5, 128k chunk, algorithm 0 [6/5] [U_UUUU]      

md124 : active (auto-read-only) raid1 nvme8n1[1] nvme9n1[0]      
    6251217920 blocks super external:/md127/0 [2/2] [UU]      

md125 : inactive nvme4n1[1](S) nvme5n1[0](S)      
    10402 blocks super external:imsm       

md126 : inactive nvme2n1[4](S) nvme6n1[3](S) nvme3n1[2](S) nvme0n1[1](S) nvme7n1[0](S)      
    26005 blocks super external:imsm       

md127 : inactive nvme8n1[1](S) nvme9n1[0](S)      
    10402 blocks super external:imsm

  2. In the output details for md123, find the parent volume. This is the volume name after external:. In this example, the parent volume is md126.

  3. Use the following command and note which device name is in the output, but is not listed in any volume of the cat /proc/mdstat output. In this example, it is nvme1n1.

    lsblk --nodeps -o name,model,serial
NAME    	MODEL                                    SERIAL
nvme3n1 	Micron_7450_MTFDKCC6T4TFS                23084033D60C        
nvme6n1 	Micron_7450_MTFDKCC6T4TFS                23084033D74E        
nvme7n1 	Micron_7450_MTFDKCC6T4TFS                23084033D574        
nvme1n1 	MTFDKCC6T4TGQ-1BK1JABYY                  052510B7CF53        
nvme2n1 	Micron_7450_MTFDKCC6T4TFS                23084033D60B        
nvme4n1 	Micron_7450_MTFDKBA960TFR                23053F109F15        
nvme5n1 	Micron_7450_MTFDKBA960TFR                23053F109F4F        
nvme9n1 	Micron_7450_MTFDKCC6T4TFS                23084033D451        
nvme0n1 	Micron_7450_MTFDKCC6T4TFS                23084033F771        
nvme8n1 	Micron_7450_MTFDKCC6T4TFS                23174039A362

  4. Use the following command to add the replacement drive, including the metadata volume name and the NVMe drive device name:

    mdadm --manage /dev/md126 --add  /dev/nvme1n1

  5. Use the following command to monitor the rebuild:

    cat /proc/mdstat

  6. (Optional) Enable the maximum rebuild rate, effective until the next reboot:

    echo 99999999 > /proc/sys/dev/raid/speed_limit_max
echo 99999999 > /proc/sys/dev/raid/speed_limit_min
:
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