So I’ve got a bit of a situation, I’ll try to keep it brief!
Initial server setup:
2x drives with soft RAID1 LVM thin-pool setup on the md3 RAID device
Then the md3 (raid) device gets full so in my haste to fix the problem (knowing I can’t get an additional drive added at the DC) I removed the 2nd disk from RAID and setup a new PV on it. The remaining disk was left in RAID (just 1 drive) as a PV on the VG. I then extended the thin-pool to this “new” PV to effectively double the storage within the thin-pool for use by the VMs.
The mistake I made when doing this is (probably one of many), I forgot to completely format the drive so the previous LV structure was still present when I extended the thin-pool but I didn’t realise this until some time afterwards. However from my research I understand that when you set up a new PV on an existing volume, it’s a destructive act so despite the previous LV structure still showing the new drive is being used by LVM and it is spanning any new data across the two PV’s.
Not a perfect solution but it resolved the initial issue of no space being available.
Now I’m left trying to resolve this issue:
The thin-pool across the two drives is only 43% full of data + meta data
[root@XXX ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert test vg1 Vwi-a-tz-- 5.00g thin_pool 20.00 thin_pool vg1 twi-aotz-- 3.14t 42.63 28.69
[root@XXX ~]# pvdisplay -C PV VG Fmt Attr PSize PFree /dev/md3 vg1 lvm2 a-- <1.58t 0 /dev/nvme0n1p4 vg1 lvm2 a-- <1.58t 15.73g [root@XXX ~]# vgdisplay -C VG #PV #LV #SN Attr VSize VFree vg1 2 59 0 wz--n- <3.16t 15.73g
It would appear that even though there should be enough space left across the two drives, the PE’s that were “left over” (when I forgot to format) are still being treated as if they’re in use so I barely have any free PE’s left.
When you do a
lvs the LVs are not duplicated in either quantity or LV size, they’re exactly as I would expect them to be and the usage of the LV’s again is what I would expect them to be, not duplicated or doubled.
Any ideas on how to resolve this highly frustrating and self-made situation?
Any help would be enormously appreciated.
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