[dm-crypt] Is removing a HDD after umount, without remove, considered safe?

Matthias Schniedermeyer ms at citd.de
Mon Feb 6 15:14:08 CET 2012


I want to integrate a dm-crypted USB-HDD with autofs.

The first part of setting up dm-crypt can be put into udev, so that the 
dm-crypt-device is setup immediatly after plugging in the HDD, which in 
turn can then be used with autofs.

So my question is: Is it safe to unplug the HDD after the filesystem is 
umounted, but with the dm-crypt-device still in existance?
(IOW: Are all dirty blocks immediately written to the HDD (at least at 
umount-time), or can there be something still buffered in the dm-crypt 

Bis denn

Real Programmers consider "what you see is what you get" to be just as 
bad a concept in Text Editors as it is in women. No, the Real Programmer
wants a "you asked for it, you got it" text editor -- complicated, 
cryptic, powerful, unforgiving, dangerous.

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