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

[DustinB3403]

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.

[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]

Obviously so I can use these same drives in my other topic regarding RAID.

[DustinB3403]

/dev/sdb /dev/sdc /dev/sdd /dev/sde are the disk that I'd love to just zero out quickly.

[scottalanmiller]

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

[DustinB3403]

@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?

[DustinB3403]

I'm at a CLI from a bootable USB, just trying to clear the /dev/sdb1 etc from these repurpose drives quickly so I can move on with creating an OBR10.

[scottalanmiller]

If this is a one time thing, just open several shells and copy/paste the command and kick it off, one disk in each shell tab.

[DustinB3403]

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

[DustinB3403]

That seems like it should work, Let me test a bit.

[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