I've got a big disk worth few TBs ( 5 TBs ) and i need fill up this disk space to about 95%, this is a linux centos box.
I've tried dd as in
dd if=/dev/zero of=o_File1.img bs=209715200 count=1000
even tried running in a loop like
#!/bin/bash
count_=0
parallel_=10
BS=2097152000
COUNT=100
while [ $count_ -lt $parallel_ ]
do
file="Dummy_DD_BS_"$BS"_$(date +%Y%M%d%H%m%s)_$count_.img"
echo $file
`dd if=/dev/zero of=$file bs=$BS count=$COUNT > /dev/null 2>&1 &`
count_=$((count_+1))
done
but 5 TB seems like a hell lot.
is there a faster method, I'm Okay with any scripts python/perl/bash or anything, I'm looking for a fast optimized solution
Edit:
Okay so following the quickly-create-a-large-file-on-a-linux-system did not really solve much anything
case 1 :
dd
time dd if=/dev/zero of=filename10 bs=1G count=10
10+0 records in
10+0 records out
10737418240 bytes (11 GB) copied, 34.0468 s, 315 MB/s
real 0m34.108s
user 0m0.000s
sys 0m13.498s
so an estimated around 3 - 4 hours to fill this 5 TB
Case 2 :
fallocate
fallocate failed: Operation not supported
its a custom file system not the popular ext*
Case 3 :
truncate
this is the weirdest ones
it doesn't really fill the disk this seems to be just reserving the space for the file so definitely not suiting my requirements
so is there a better solution or I have to live with dd or create smaller partition to test this
