Re: Help request: setting up /dev/zero using dm-crypt ...

Heinz Mauelshagen <heinzm@xxxxxxxxxx> · Wed, 7 Feb 2018 14:43:28 +0100



    On 02/07/2018 09:50 AM, Ravi Prakash Putchala wrote:

    
      Thank you, Milan. Will try these.

        
                If you need experiment over a memory device, use either
                ramdisk, scsi_debug module to it.

                Another alternative is to create dm-zero device and use
                plain dm-crypt (not LUKS).

              
                create dm-zero device:  How do I do this? Sorry, I do
                not have much expertise in Linux.

              
    E.g. 10TiB "zero" mapped device (pick your name instead of 'z'):

    
    dmsetup create z --table "0 $((10*1024*1024*1024*2)) zero"

    
    Block device node for this is:

    
     /dev/mapper/z

    
    See dmsetup(8) and device-mapper target documentation in kernel
    source,

    for instance Documentaion/device-mapper/zero.txt.

    
    Heinz

    
              Ravi

              
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