Hi, On Fri, Aug 27, 2021 at 3:00 PM Sreyan Chakravarty <[email protected]> wrote:
> Hi, > > I have just installed a new Fedora 33 KDE system. > > So this is my layout: > > > NAME MAJ:MIN RM SIZE RO TYPE > MOUNTPOINT > sda 8:0 0 931.5G 0 disk > ├─sda1 8:1 0 512M 0 part > /boot/efi > ├─sda2 8:2 0 1G 0 part > /boot > └─sda3 8:3 0 930G 0 part > └─luks-aee439f3-528c-4481-ab09-622304e727bc 253:0 0 930G 0 crypt > ├─vgfedora-pool00_tmeta 253:1 0 424M 0 lvm > │ └─vgfedora-pool00-tpool 253:3 0 829.2G 0 lvm > │ ├─vgfedora-fedora 253:4 0 829.2G 0 lvm / > │ └─vgfedora-pool00 253:5 0 829.2G 1 lvm > └─vgfedora-pool00_tdata 253:2 0 829.2G 0 lvm > └─vgfedora-pool00-tpool 253:3 0 829.2G 0 lvm > ├─vgfedora-fedora 253:4 0 829.2G 0 lvm / > └─vgfedora-pool00 253:5 0 829.2G 1 lvm > > The same thing as above in pastebin: https://pastebin.com/raw/xwXngMRh > > If you notice that /dev/sda3 is of size 930G, but the volume group is only > 829.2 G. > > Why is that ? I have selected the size of the volume group as "Large as > possible", but still 100G is left out. > > Is this some kind of recommended setting for thin-LVMs ? > > I am selecting Thin-LVM with LUKS2 during the install. > > Can someone help me understand why this is happening and how I can fix it > ? > There are some circumstances under which LVM may need additional space for thin pool metadata. When we added support for thin provisioning they strongly recommended that we reserve a portion of the volume group space for this purpose.Initially it was 20% of the pool size, but the calculation may be more nuanced now. I wouldn't consider removing this bit of free space "fixing" anything unless you plan to actively monitor your system to ensure that your thin pool doesn't run out of space for metadata. > > Will making a custom kickstart help here ? > Maybe... It has been a while since I worked on this code, but you _might_ be able to override this in kickstart using `--reserved-space` or `--reserved-percent` options to the `volgroup` command. HTH, David > > -- > Regards, > Sreyan Chakravarty > _______________________________________________ > Kickstart-list mailing list > [email protected] > https://listman.redhat.com/mailman/listinfo/kickstart-list
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