Dumb question - linux dd write 0s to multiples disks at once

scottalanmiller

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

So just ctlr alt f2 multiple times and than the dd command for each disk?

If you don't have windows...

nohup command &

Then run each command that way.

DustinB3403

Do you know if there are only two shells available in the DVD iso of CentOS 7?

Seems that way from what I have here.

scottalanmiller

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

Do you know if there are only two shells available in the DVD iso of CentOS 7?

Seems that way from what I have here.

Just use nohup andyou can run as many thing as you want at once from a single shell.

DustinB3403

@scottalanmiller said in Dumb question - linux dd write 0s to multiples disks at once:

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

Do you know if there are only two shells available in the DVD iso of CentOS 7?

Seems that way from what I have here.

Just use nohup andyou can run as many thing as you want at once from a single shell.

um ok

DustinB3403

Bash command not found

Is that not an option with pre installation using a bootable USB?

travisdh1

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

@scottalanmiller said in Dumb question - linux dd write 0s to multiples disks at once:

With a single command, no. But you can run several commands at once.

That would suffice, what would it look like?

tack a ; to the end of each dd command and put them all on a single line

dd if=/dev/zero of=/dev/sda bs=4k; dd if=dev/zero of=/dev/sdb bs=4k

DustinB3403

@travisdh1 said in Dumb question - linux dd write 0s to multiples disks at once:

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

@scottalanmiller said in Dumb question - linux dd write 0s to multiples disks at once:

With a single command, no. But you can run several commands at once.

That would suffice, what would it look like?

tack a ; to the end of each dd command and put them all on a single line

as

dd if=/dev/zero of=/dev/sdb bs=4k; dd if=/dev/zero of=/dev/sdc bs=4k; dd if=/dev/zero of=/dev/sdd bs=4k; dd if=/dev/zero of=/dev/sde bs=4k

right?

travisdh1

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

@travisdh1 said in Dumb question - linux dd write 0s to multiples disks at once:

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

@scottalanmiller said in Dumb question - linux dd write 0s to multiples disks at once:

With a single command, no. But you can run several commands at once.

That would suffice, what would it look like?

tack a ; to the end of each dd command and put them all on a single line

as

dd if=/dev/zero of=/dev/sdb bs=4k; dd if=/dev/zero of=/dev/sdc bs=4k; dd if=/dev/zero of=/dev/sdd bs=4k; dd if=/dev/zero of=/dev/sde bs=4k

right?

yes

DustinB3403

It works!

Now just to go home and drink and come back to this Monday.

Thanks guys!

scottalanmiller

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

@travisdh1 said in Dumb question - linux dd write 0s to multiples disks at once:

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

@scottalanmiller said in Dumb question - linux dd write 0s to multiples disks at once:

With a single command, no. But you can run several commands at once.

That would suffice, what would it look like?

tack a ; to the end of each dd command and put them all on a single line

as

dd if=/dev/zero of=/dev/sdb bs=4k; dd if=/dev/zero of=/dev/sdc bs=4k; dd if=/dev/zero of=/dev/sdd bs=4k; dd if=/dev/zero of=/dev/sde bs=4k

right?

That makes one run right after the other, they don't run at the same time.

scottalanmiller

@travisdh1 said in Dumb question - linux dd write 0s to multiples disks at once:

dd if=/dev/zero of=/dev/sdb bs=4k

nohup dd if=/dev/zero of=/dev/sdb bs=4k &
nohup dd if=/dev/zero of=/dev/sdc bs=4k &
nohup dd if=/dev/zero of=/dev/sdd bs=4k &

Like that

DustinB3403

@scottalanmiller but nohup from the live us isn't an option.

scottalanmiller

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

@scottalanmiller but nohup from the live us isn't an option.

Oh, what shell are you in?

black3dynamite

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

@scottalanmiller but nohup from the live us isn't an option.

Using Ubuntu live usb?

DustinB3403

Centos 7

scottalanmiller

What is the result of this command..

echo $0

DustinB3403

@scottalanmiller said in Dumb question - linux dd write 0s to multiples disks at once:

What is the result of this command..
echo $0

Not at the office, so I don't know

black3dynamite

https://unix.stackexchange.com/revisions/284489/1

dd if=/dev/zero | tee >(dd of=/dev/sdb) >(dd of=/dev/sdc) | dd of=/dev/sdd

Obsolesce

@dustinb3403 said in Dumb question - linux dd write 0s to multiples disks at once:

Is it possible to use linux DD to write 0's to multiple disks at once?

The goal would be to wipe 4 drives at once.

What if you create a SW RAID 10 with them quick, then write zeros?

Alex Sage

Does writing zeros to an SSD drive affect the drive life?