How to configure RAID in GUI mode during installation of Red Hat Enterprise Linux 7?

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux 7

Issue

  • How to setup RAID in GUI mode during installation of Red Hat Enterprise Linux 7?

Resolution

Following method of installation has worked for us to configure software RAID1. Below method could be used as a reference to configure any other type of RAID.

1. At the screen to create partitions, select the two disks and select the option to configure the partitions manually

See below image

2. Create the partitions as shown in below imgaes. Make sure all the parameters are seen as shown in the screenshot. This is just for 2 partitions, you could configure as many partitions as you want


The final result would be similar to

Raw
# cat /proc/mdstat 
Personalities : [raid1] 
md125 : active raid1 vdb3[1] vda3[0]
      1048576 blocks super 1.2 [2/2] [UU]

md126 : active raid1 vdb2[1] vda2[0]
      1049536 blocks super 1.0 [2/2] [UU]
      bitmap: 0/1 pages [0KB], 65536KB chunk

md127 : active raid1 vda1[0] vdb1[1]
      20480000 blocks super 1.2 [2/2] [UU]
      bitmap: 1/1 pages [4KB], 65536KB chunk

unused devices: <none>


# fdisk -l

Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0004db5f

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1            2048    40994815    20496384   fd  Linux raid autodetect
/dev/vda2   *    40994816    43094015     1049600   fd  Linux raid autodetect
/dev/vda3        43094016    45193215     1049600   fd  Linux raid autodetect

Disk /dev/vdb: 42.9 GB, 42949672960 bytes, 83886080 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000587c4

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048    40994815    20496384   fd  Linux raid autodetect
/dev/vdb2   *    40994816    43094015     1049600   fd  Linux raid autodetect
/dev/vdb3        43094016    45193215     1049600   fd  Linux raid autodetect

Disk /dev/md127: 21.0 GB, 20971520000 bytes, 40960000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/md126: 1074 MB, 1074724864 bytes, 2099072 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/md125: 1073 MB, 1073741824 bytes, 2097152 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/md127       20G  3.4G   17G  17% /
devtmpfs        488M     0  488M   0% /dev
tmpfs           497M   84K  497M   1% /dev/shm
tmpfs           497M  7.1M  490M   2% /run
tmpfs           497M     0  497M   0% /sys/fs/cgroup
/dev/md126     1015M  113M  903M  12% /boot

# cat /etc/fstab 

#
# /etc/fstab
# Created by anaconda on Wed Dec  9 11:03:28 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=16bfe7ce-be90-4f29-8713-7291fa0e7f69 /                       xfs     defaults        0 0
UUID=5fd864fe-f18b-4abc-8823-b78ed2f2b84e /boot                   xfs     defaults        0 0
UUID=77d4e244-55c4-48c9-920e-a6d0a30617c7 swap                    swap    defaults        0 0

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