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

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

DustinB3403

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