Is this much disk usage normal for a brand new build?

[ahwtx]

Hi all,

Just completed my first unRAID build.  I'm running 6.6.7 and have four 8TB HDDs in my array, a single 10TB HDD for parity and a 512GB SSD for cache.  Is it normal for this much disk usage (see below) without having written anything to the array yet?  I should note that I'm about 50% through initial parity sync and not sure if that factors into the mix with any temp data in play.

 

root@kunnandi:~# df
Filesystem       1K-blocks     Used   Available Use% Mounted on
rootfs            16411640   572700    15838940   4% /
tmpfs                32768      180       32588   1% /run
devtmpfs          16411656        0    16411656   0% /dev
tmpfs             16492536        0    16492536   0% /dev/shm
cgroup_root           8192        0        8192   0% /sys/fs/cgroup
tmpfs               131072      228      130844   1% /var/log
/dev/sda1         30258736   195360    30063376   1% /boot
/dev/loop0            8320     8320           0 100% /lib/modules
/dev/loop1            4992     4992           0 100% /lib/firmware
/dev/md1        7811939620  8588992  7803350628   1% /mnt/disk1
/dev/md2        7811939620  8588992  7803350628   1% /mnt/disk2
/dev/md3        7811939620  8588992  7803350628   1% /mnt/disk3
/dev/md4        7811939620  8588992  7803350628   1% /mnt/disk4
/dev/sdg1        500107576 22042240   477019904   5% /mnt/cache
shfs           31247758480 34355968 31213402512   1% /mnt/user0
shfs           31747866056 56398208 31690422416   1% /mnt/user
/dev/loop2        20971520    17148    18856516   1% /var/lib/docker
/dev/loop3         1048576    16772      926268   2% /etc/libvirt

 

I'm especially curious about the cache drive.  Why is there a 20GB docker image?

 

root@kunnandi:/mnt/cache# du -h
20G	./system/docker
1.0G	./system/libvirt
21G	./system
0	./appdata
0	./domains
22G	.

root@kunnandi:/mnt/cache/system/docker# ls -al
total 20971520
drwxrwxrwx 1 root   root           20 Apr 20 14:38 ./
drwxrwxrwx 1 nobody users          26 Apr 20 14:38 ../
-rw-rw-rw- 1 nobody users 21474836480 Apr 20 15:14 docker.img

 

[trurl]

2 minutes ago, ahwtx said:

Is it normal for this much disk usage (see below) without having written anything to the array yet?  I should note that I'm about 50% through initial parity sync and not sure if that factors into the mix with any temp data in play.

Yes, there is a lot of overhead in the XFS filesystem apparently. And no, parity has nothing to do with it.

 

3 minutes ago, ahwtx said:

I'm especially curious about the cache drive.  Why is there a 20GB docker image?

Because that is what was set for the docker image when you enabled docker services. That space will be used to install dockers into.