Thank you. On Sun 2020-05-10 07.39.31, Greater London Linux User Group wrote:
On 09/05/2020 20:32, Dr. Axel Stammler via GLLUG wrote:On Sat 2020-05-09 11.24.15, Greater London Linux User Group wrote:How do you intend to combine them? You won't be able to put your existing array into the LVM without destroying its contents.https://www.debian.org/doc/manuals/debian-handbook/advanced-administration.en.html#sect.raid-and-lvmsays you can use lvresize and resize2fs to do just that. I am still hoping this will work.I think you may be mis-reading the manual. What you can do is increase the size of an existing Logical Volume, but you can't do an in-situ conversion of an existing non-LV filing system.
You are quite right, I was mis-reading the manual. So I cannot incorporate an existing filesystem (no matter whether regular or on a RAID-1 system) into a new Logical Volume system; I see. It really sounded to good to be true: ”RAID-1+0: This isn't strictly speaking, a RAID level, but a stacking of two RAID groupings. Starting from 2×N disks, one first sets them up by pairs into N RAID-1 volumes; these N volumes are then aggregated into one, either by “linear RAID” or (increasingly) by LVM. This last case goes farther than pure RAID, but there's no problem with that.“
One thing which might work for you is to make your two new drives into a RAID1 set and then use resulting device as your first Physical Volume. Create a large logical volume within it, copy all your existing files over (boring), delete the partition on the old RAID1 set, create a second PV, add it to your Volume Group and then expand the LV.It does mean moving all your data from old drives to new, but at least you'd then end up with one much larger filing system.
Hmm. How long would it take to copy (nearly) 8 TB? Obviously I would have to prevent any write access for that period of time.
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