On Mon, Dec 10, 2018 at 5:43 PM Alexis Grillon <alexis.gril...@meshs.fr> wrote:
> > . Installation : > > Each host is installed with the node iso. > Harddrive are not SSD and are in RAID5 (physical or logical) > Each harddrive has a standard oVirt node install auto partitionning, > except for one thing, we reduce the / mount point to make a new > partition in XFS for the data storage mount point (the partition is > inside LVM in our case) > > . The problem : > > We experienced on all of this hosts huge discrepancy between the LVS > command and DF on usage of the different partition. (sometimes up to a > 90% difference !) > Spoiler alert, DF is right, LVM is wrong. > I think (but i might be wrong), that when we delete -in ovirt- a lot of > data on the drive, LVM doesn't get all the data about that. > > Hi Alexis, what do you mean with "LVM doesn't get all the data"? Do you use thin provisioned or something like that? Otherwise if you create an LV with N Gb in size, that is its size forever if you don't manually change it. In any case for block based and file based trim/discard functionalities and limitations you should read this below if not already done: https://ovirt.org/develop/release-management/features/storage/pass-discard-from-guest-to-underlying-storage/ HIH, Gianluca
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