On Tuesday 22 November 2016 18:10:53 Kamil Jońca wrote: > 2. there is md0 (raid1) with two disk in it. It is PV for lvm. > I want to extend space by adding another two disks. Is it possible somehow > extent md0? Or the only way is to create second md device, and assign it > to volume group?
I can only answer this question. I did something similar on an old computer several years ago except I had to grow the LV using other partitions instead of adding new disks. The computer had two disks. Each disk had a partition assembled as a raid1 array md0. md0 was the only PV of the VG. When I had to grow the VG, I reclaimed two existing partitions from each disk and assembled them as md1 and md2. Then I added /dev/md1 and /dev/md2 to the VG. It doesn't matter to the VG if it is made of /dev/sda1 and /dev/sdb2 or /dev/md0 and /dev/md1. Then follow the usual procedure to grow the LV and the file system. Frederic