I would also like to add that the OSDs can (and will) use redirect on write techniques (not to mention the physical device hardware as well). Therefore, your zeroing of the device might just cause the OSDs to allocate new extents of zeros while the old extents remain intact (albeit unreferenced and available for future writes). The correct solution would be to layer LUKS/dm-crypt on top of the RBD device if you need a strong security guarantee about a specific image, or use encrypted OSDs if the concern is about the loss of the OSD physical device. On Tue, May 12, 2020 at 6:58 AM Marc Roos <M.Roos@f1-outsourcing.eu> wrote:
dd if=/dev/zero of=rbd ???? :) but if you have encrypted osd's, what would be the use of this?
-----Original Message----- From: huxiaoyu@horebdata.cn [mailto:huxiaoyu@horebdata.cn] Sent: 12 May 2020 12:55 To: ceph-users Subject: [ceph-users] Zeroing out rbd image or volume
Hi， Ceph folks,
Is there a rbd command, or any other way, to zero out rbd images or volume? I would like to write all zero data to an rbd image/volume before remove it.
Any comments would be appreciated.
best regards,
samuel Horebdata AG Switzerland
huxiaoyu@horebdata.cn _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
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-- Jason