Adam, TL;DR : You nailed it! Le 03/10/2017 à 18:12, Adam Litke a écrit :
Does this report an error on the host where you are having problems activating logical volumes?
lvs -a -o +devices
On the hosts where I can't activate a LV, this command returns nothing interesting : root@serv-hv-prd03:~# lvs -a -o +devices LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices home cl -wi-ao---- 56,25g /dev/sda2(1024) root cl -wi-ao---- 50,00g /dev/sda2(15423) swap cl -wi-ao---- 4,00g /dev/sda2(0) and so goes for pvs and vgs.
Also, do the lvm commands succeed when you explicitly disable lvmetad, ie...
lvchange --config 'global {use_lvmetad=0}' -ay ...
Disabling lvmetad usage allows the activation to succeed. Having understand that, I tried to run some usual LVM commands like pvs vgs, lvs, pvscan, vgscan, lvscan, lvmdiskscan, and they all returned some quite empty answers (to be short : only the local LV). Having understood the role of lvmetd, I ran pcscan --cache, and all in a sudden it filled up the LVM informations : I found back all my oVirt LVM storage domains, as I could see on other hosts. Things to note : - trying to run a VM on empty LVM cache was nonetheless successful - before filling the lvmetad cache, I checked this daemon was running and it was. -- Nicolas ECARNOT