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?
dd
while/mnt/raid6
was mounted?mkfs
again. I hope you did not have any data there.