I have a long-running Debian server (myserver)that’s had everything but the OS moved into a zpool (output of command redacted, file sizes won’t add up):
user1@myserver:~$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
tank 3.02T 505G 104K /tank
tank/data 1.50T 505G 6.28M /tank/data
tank/data/home 511G 505G 96K /tank/data/home
tank/data/home/user1 259G 505G 259G /home/user1
tank/data/home/user2 30.8M 505G 10.7M /home/user2
tank/data/vm 321G 505G 200G /tank/data/vm
tank/ephemeral 51.6G 505G 4.40G /tank/ephemeral
tank/reserved 700G 1.18T 96K /tank/reserved
I’m replicating the server to another one but I’m also doing periodic backups to a USB HDD wd202501 which has a single zpool called wd202501 and a dataset called bkmyserver. I formatted the drive and backed up my server. No problems.
I also have a laptop (mylaptop) onto which I recently installed ZFSBootMenu and Ubuntu:
user1@mylaptop:~$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
zroot 375G 1.39T 192K none
zroot/ROOT 10.8G 1.39T 192K none
zroot/ROOT/ubuntu 10.8G 1.39T 10.8G /
zroot/home 364G 1.39T 7.62M /home
zroot/home/user1 364G 1.39T 344G /home/user1
zroot/home/user2 952K 1.39T 952K /home/user2
I would like to also back up my laptop to wd202501, in a dataset called bkmylaptop.
I attached he drive to my laptop and ran zpool import:
user1@mylaptop:~$ sudo zpool import -d /dev/disk/by-id/ata-WDC_REDACTED-REDACTEDREDACTEDREDACTED-part1 wd202501 -N
Before I ran zfs mount -l wd202501/bkwilson I ran zfs list and saw this:
user1@mylaptop:~$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
wd202501 1.30T 2.21T 104K /mnt/wd202501
wd202501/bkmyserver 1.20T 2.21T 200K /mnt/wd202501/bkmyserver
wd202501/bkmyserver/data 1.20T 2.21T 1.36M /mnt/wd202501/bkmyserver/data
wd202501/bkmyserver/data/home 496G 2.21T 96K /tank/data/home
wd202501/bkmyserver/data/home/user1 248G 2.21T 248G /home/user1
wd202501/bkmyserver/data/home/user2 2.77M 2.21T 2.77M /home/user2
wd202501/bkmyserver/data/vm 111G 2.21T 67.8G /mnt/wd202501/bkmyserver/data/vm
wd202501/reserved 100G 2.31T 96K /mnt/wd202501/reserved
zroot 375G 1.39T 192K none
zroot/ROOT 10.8G 1.39T 192K none
zroot/ROOT/ubuntu 10.8G 1.39T 10.8G /
zroot/home 364G 1.39T 7.62M /home
zroot/home/user1 364G 1.39T 344G /home/user1
zroot/home/user2 952K 1.39T 952K /home/user2
Both zroot/home/user1 and wd202504/bkmyserver/data/home/user1 have a mountpoint set to /home/user1. It does not appear that wd202504/bkmyserver/data/home/user1 overwrote zroot/home/user1, but I had not run zfs mount yet.
[The mountpoint for wd202501/bkmyserver/data/home points to /tank/data/home rather than /home but I’m not sure if that’s important for this question.]
My questions:
If I run zfs mount will wd202501/bkmyserver/data/home/user1 clobber zroot/home/user1 on mylaptop?
If I replicate mylaptop’s zroot to wd202501/bkmylaptop, will the two mountpoints conflict with each other? Will they conflict if I replicate mylaptop to my replication server?
Should I just not be doing these mountpoints in the first place?
Where do the mountpoint settings reside? Are they part of the dataset or the zpool?
Is it possible to keep the mountpoints on the source zpool but unset them on the backup zpool? Will they get re-set whenever I replicate a snapshot?