ZFS and free space
Matthew Seaman
matthew at FreeBSD.org
Wed Aug 16 14:36:33 UTC 2017
On 16/08/2017 09:03, Johan Helsingius wrote:
> Hi, Mike,
>
> On 16-08-17 07:45, Michael Schuster wrote:
>> I wonder ... is zroot/usr/home part of zroot/home? Naming suggests
>> otherwise.
>>
>> Perhaps you can try
>> # zfs list -t all | egrep 'home|usr'
>> (or simply 'zfs list -t all', if that doesn't produce too much output)
>> and see whether that helps ...
>
> # zfs list -t all
> NAME USED AVAIL REFER MOUNTPOINT
> zroot 10.2T 47.8G 140K /zroot
> zroot/ROOT 3.01G 47.8G 140K none
> zroot/ROOT/default 3.01G 47.8G 3.01G /
> zroot/home 5.98T 47.8G 5.98T /home/storage
> zroot/tmp 163K 47.8G 163K /tmp
> zroot/usr 4.17T 47.8G 140K /usr
> zroot/usr/home 4.17T 47.8G 4.17T /usr/home
> zroot/usr/ports 1.26G 47.8G 1.26G /usr/ports
> zroot/usr/src 140K 47.8G 140K /usr/src
> zroot/var 1.42M 47.8G 140K /var
> zroot/var/audit 140K 47.8G 140K /var/audit
> zroot/var/crash 140K 47.8G 140K /var/crash
> zroot/var/log 761K 47.8G 761K /var/log
> zroot/var/mail 140K 47.8G 140K /var/mail
> zroot/var/tmp 140K 47.8G 140K /var/tmp
>
> So /zroot is 10T, zroot/home is 6T and zroot/usr (and zroot/usr/home)
> is 4T - so clearly they are separate. But what is taking up the space
> on zroot/usr/home? "du" doesn't show anything there!
>
> # du -sh /usr/home/*
> 715M /usr/home/julf
> 4.2T /usr/home/storage
>
> # file /home
> /home: symbolic link to usr/home
>
> # ls -id /usr/home/storage/ /home/storage
> 18 /home/storage 18 /usr/home/storage/
Try this:
# zfs umount zroot/home
# du -shc /usr/home/storage
If there is any directory contents under the mountpoint for your storage
ZFS then when /usr/home/storage is mounted over it, it will still take
up space in your zpool, but you won't be able to access it at all.
Aside from anything else, I'd do this:
# rm /home
# zfs rename zroot/home zroot/home2
# zfs rename zroot/usr/home zroot/home
# zfs rename zroot/home2 zroot/home/storage
# zfs set canmount=on zroot/home
# zfs inherit mountpoint zroot/home/storage
# ln -s /usr/home /home
So you should end up with
zroot/home mounted on /home
zroot/home/storage mounted on /home/storage
Personally I like to mount /home directly rather than faffing around
with symlinks, and this will make your zfs hierarchy rather less
confusing. The one slight gotcha is that you have to set the 'canmount'
property on zroot/home, since you don't want to inherit the
'canmount=off' setting that zroot has.
Cheers,
Matthew
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