| 1 |
Having /dev/dm-1 mounted on /usr would not be an issue if it was |
| 2 |
supposed to be that way; however, nothing in the handbook or anything |
| 3 |
else I have read says that is correct. In addition, every other system |
| 4 |
I have setup or used always had /usr as the mount point in the fstab. |
| 5 |
|
| 6 |
My primary questions are: |
| 7 |
* Why is it different this time? |
| 8 |
* What changed to make /usr mount the block device? |
| 9 |
* Why is the /usr record in the fstab being ignored and being handled |
| 10 |
differently that /var, /opt, /home and /vm ? |
| 11 |
|
| 12 |
Even though everything seems to be work correctly, without a good and |
| 13 |
authoritative explanation my confidence level in the stability is not |
| 14 |
too high and is preventing me from relying on it as primary host. |
| 15 |
|
| 16 |
My concerns about not having a good explanation for why df -h shows |
| 17 |
/dev/dm-1 on /usr instead of /dev/mapper/vg0-usr are: |
| 18 |
* There could be problems interfacing directly with the block device |
| 19 |
(/dev/dm-1) and not the link (/dev/mapper/vg0-usr). |
| 20 |
* When it comes time to extend the /usr logical volume and use commands |
| 21 |
like lvextend, resize2fs, lvresize and some others it may cause problems. |
| 22 |
* The documentation does not say this is correct, in fact the |
| 23 |
documentation specifically says the opposite that the fstab is used for |
| 24 |
the mount points. |
| 25 |
* It looks like the initramfs is not letting go of the temporary /usr |
| 26 |
mount and mounting /usr in the vg0-usr volume group correctly. |
| 27 |
|
| 28 |
After reinstalling Gentoo with a new liveusb, my system still looks |
| 29 |
similar to the way it was before. I started with the existing partition |
| 30 |
schema and wiped everything and performed a separate independent |
| 31 |
install. I am still not sure why the /dev/dm-1 block device is mounted |
| 32 |
on /usr which is not what the fstab is instructing. |
| 33 |
|
| 34 |
UUIDs are not being used because the handbook says: |
| 35 |
*Important:* UUIDs of the filesystem on a LVM volume and its LVM |
| 36 |
snapshots are identical, therefore using UUIDs to mount LVM volumes |
| 37 |
should be avoided. |
| 38 |
|
| 39 |
/etc/fstab: |
| 40 |
/dev/nvme0n1p6 /boot ext2 |
| 41 |
defaults,noatime 0 2 |
| 42 |
/dev/nvme0n1p7 none swap |
| 43 |
sw 0 0 |
| 44 |
/dev/nvme0n1p8 / ext4 |
| 45 |
defaults,noatime,discard 0 1 |
| 46 |
/dev/nvme0n1p9 /lib/modules ext4 |
| 47 |
defaults,noatime,discard 0 1 |
| 48 |
/dev/nvme0n1p10 /tmp ext4 |
| 49 |
defaults,noatime,discard 0 1 |
| 50 |
/dev/mapper/vg0-usr /usr ext4 |
| 51 |
defaults,noatime,discard 0 0 |
| 52 |
/dev/mapper/vg0-home /home ext4 |
| 53 |
defaults,noatime,discard 0 1 |
| 54 |
/dev/mapper/vg0-opt /opt ext4 |
| 55 |
defaults,noatime,discard 0 1 |
| 56 |
/dev/mapper/vg0-var /var ext4 |
| 57 |
defaults,noatime,discard 0 1 |
| 58 |
/dev/mapper/vg1-vm /vm ext4 |
| 59 |
noauto,noatime,discard 0 1 |
| 60 |
/dev/cdrom /mnt/cdrom auto rw,exec,noauto,user 0 0 |
| 61 |
|
| 62 |
/etc/initramfs.mounts has: |
| 63 |
/usr |
| 64 |
|
| 65 |
# ls -l /dev/mapper/vg0-usr |
| 66 |
lrwxrwxrwx 1 root root 7 Apr 23 05:56 /dev/mapper/vg0-usr -> ../dm-1 |
| 67 |
|
| 68 |
# mount /usr |
| 69 |
mount: /usr: /dev/mapper/vg0-usr already mounted or mount point busy. |
| 70 |
|
| 71 |
# df -h /usr |
| 72 |
Filesystem Size Used Avail Use% Mounted on |
| 73 |
/dev/dm-1 25G 3.2G 20G 14% /usr |
| 74 |
|
| 75 |
Thank you |
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