I am working with the RAID6 configuration with 4 disks involved, each of size 8TB. Hence the total capacity = (n-2) * s, where
n = number of disks and
s = size of disks. So in my case it is 16TB.
Below is the information before the
dd operation is performed:
df -h /mnt/raid6/ Filesystem Size Used Avail Use% Mounted on /dev/md0 15T 1.1G 14T 1% /mnt/raid6
dd operation performed:
dd if=/dev/zero of=/dev/md0 bs=1G count=5 oflag=dsync 5+0 records in 5+0 records out 5368709120 bytes (5.4 GB) copied, 76.7451 s, 70.0 MB/s
Information after performing dd operation:
df -h /mnt/raid6/ Filesystem Size Used Avail Use% Mounted on /dev/md0 64Z 64Z 15T 100% /mnt/raid6
My confusion is here, when I have performed a write operation with 5GB file on the RAID6 devices, why the output is shown as Used = 64Z?