Write zero’s to disk Infinite loop

jacob — Fri, 30 Jul 2010 22:05:49 +0000

I was bored… So this is a little bash script i wrote that will write zero’s to a hard disk infinately until you press CTRL+C. It uses dcfldd instead of plain dd because i like the progress output it provides.

#!/bin/bash
echo -e "Which disk would you like to wipe out? (sda, sdb, sdc)?   \c"
read DISK
read -p "You picked "$DISK", are you sure? (y/n)" -n 1
if [[ $REPLY =~ ^[Yy]$ ]]
then
C=1
for (( ; ; ))
do
        echo -e "\nStarting zero Sweep number "$C" ..."
        dcfldd if=/dev/zero of=/dev/$DISK
        echo "Zero's written to Disk "$C" time(s)"
        echo "[ hit CTRL+C to stop ]"
        let C=C+1
done
fi

ZFS Cant rm: No space left on device

jacob — Tue, 19 Jan 2010 22:52:42 +0000

If you completely fill up a zfs pool, it wont let you delete files on it. What you CAN do, is pick a scapegoat file to wipe out or remove a snapshot. Then you will be able to use the rm command. what I did:


# df -h
Filesystem     Size    Used   Avail Capacity  Mounted on
themirror       39G     39G      0B   100%    /home/jacob/themirror
# rm 3gfile
rm: 3gfile: No space left on device
# dd if=/dev/null of=3gfile
0+0 records in
0+0 records out
0 bytes transferred in 0.000046 secs (0 bytes/sec)
# rm 3gfile

SurlyJake » dd

Write zero’s to disk Infinite loop

ZFS Cant rm: No space left on device