Red Hat

Hello,

1 ) Fdisk -l # Displays all the disk with partition table information

My Query )

A ) How can i make one disk ex: /dev/sdd not visible in fdisk -l output ?
B) From where fdisk -l collect and display the information ?

Try:

Code:

fdisk -l | awk '$0!~s "[0-9:]"' s=/dev/sdd RS= ORS='\n\n'

Thanks.. :-)

What if we do not have use awk. I am looking at as

Suppose a disk /dev/sdd is gone faulty and we do not want this disk to be visible ...isnt there is somewhere we can blacklist kinda do for this disk....so, that whoever is firing fdisk -l does not have to remember the faulty disk name ???

If you well and truly don't want anything to touch that disk, you could remove the device file...

Temporarily (until next boot) remove disk sdd from system

Code:

echo 1 > /sys/block/sdd/device/delete

If you want to add disk sdd back to the system without reboot you must know the host number BEFORE removing it, which the following command will do.

Code:

 readlink /sys/block/sdd

The red part is what you need:

Code:

../devices/pci0000:00/0000:00:10.0/host2/target2:0:3/2:0:3:0/block/sdd

Knowing that you can re-enable that disk executing:

Code:

echo "- - -" > /sys/class/scsi_host/host2/scan

Thanks everyone. This question was asked to me and my answers was to remove. However, i was specifically asked - We dont want to see the disk in fdisk output. I will keep searching and will post when i find it.

Is this one of those question asked in an interview where the interviewer must resort to "witty" and "tricks" instead of realistic questions that might concern the actual position?

A possible answer to such a BS question is that you specify the devices as parameters to list and it will not show the one you don't want. Otherwise, fdisk -l will use the content of /proc/partitions as devices to show you partition information.