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"dd" command runs when cinder deletes the volume

asked 2016-03-30 08:35:34 -0600

PZ gravatar image

updated 2016-03-30 08:37:24 -0600

Hi team,

I noticed everytime when I delete the volume in openstack, the linux dd command was called, this also has been verified by the cinder volume log--

*bb9bf47774f9ba442f5b24c71077a - - -] Performing secure delete on volume: /dev/mapper/cinder--volumes-volume--d2ec2a30--f05a--4ea0--91cf--b6e5f7dcb241

2016-03-30 21:27:54.296 4166 INFO cinder.volume.utils [req-70f81ef1-4741-4307-b45c-b6127f741f84 d6cde2bd6c6c4b8c85dd98882d680741 c06bb9bf47774f9ba442f5b24c71077a - - -] Volume copy 20480.00 MB at 89.69 MB/s**

Although the system runs OK, anyway I am wondering why the dd was called, why there is a copy action during the volume deleting, could anyone explain? Thanks a lot.

Regards, para

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It does to do a secure deletion, that means writting zeroes over your data to disable recovery under your volumes. This is a security concern to gain security against crackers and avoid data leakage.

Eduardo Gonzalez gravatar imageEduardo Gonzalez ( 2016-03-30 10:26:42 -0600 )edit

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answered 2016-03-30 09:19:21 -0600

little gravatar image

cinder deletes the image by writing zero's to the blocks.

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Thanks little, it makes sense.

PZ gravatar imagePZ ( 2016-03-30 10:20:18 -0600 )edit

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Asked: 2016-03-30 08:35:34 -0600

Seen: 223 times

Last updated: Mar 30 '16