I did the following test:
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Computer with Centos 7.5 installed on hard drive /dev/sda.
Added two hard drives to the computer: /dev/sdb and /dev/sdc.
Created a new logical volume in RAID-1 using RedHat System Storage Manager:
ssm create --fstype xfs -r 1 /dev/sdb /dev/sdc /mnt/data
Everything works. /dev/lvm_pool/lvol001 is mounted to /mnt/data. Files and folders can be copied/moved, read/written on /mnt/data.
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2.
I erased CentOS 7.5 from /dev/sda. Wrote zeros to /dev/sda using dd. Reinstalled CentOS 7 on /dev/sda. Completed yum update - reboot - yum install system-storage-manager.
RedHat system storage manager listed all existing volumes on the computer:
[root@localhost]# ssm list
-------------------------------------------------------------------------------------- Volume Pool Volume size FS FS size Free Type Mount point -------------------------------------------------------------------------------------- /dev/cl/root cl 65.00 GB xfs 64.97 GB 63.67 GB linear / /dev/cl/swap cl 8.00 GB linear /dev/lvm_pool/lvol001 lvm_pool200.00 GB xfs 199.90 GB 184.53 GB raid1 /mnt/data /dev/cl/home cl 200.00 GB xfs 199.90 GB 199.87 GB linear /home /dev/sda1 4.00 GB xfs 3.99 GB 3.86 GB part /boot -------------------------------------------------------------------------------------- [/CODE]
So far, so good. The new CentOS7 install can see the logical volume.
Mounted the volume: ssm mount -t xfs /dev/lvm_pool/lvol001 /mnt/data Works. cd to /mnt/data and I can see the files left on the volume from the previous tests. Moving/copying/read/write -- works.
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3. Is it safe to assume when using RedHat System Storage Manager it's not necessary to use the lvm commands (vgexport and vgimport) to move two physical drives containing a logical volume in raid 1 from one computer to another?
Thanks for your help and guidance.