Re: [ovirt-users] LVM structure

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