An Unencrypted Look at FileVault
Subject:   FileVault and Journaled FS...
Date:   2004-01-15 09:00:27
From:   anonymous2
Hi! A great article about FileVault!

But I am wondering if the following could be potential problem...

AFAIK, journaled HFS+ is the default filesystem for Panther. FileVault works by creating a loopback block device (the *.sparseimage file) and FileVault / Disk Utility will also format the block device as journaled HFS+.

Now we have a situation of a journalled FS running on top of another journalled FS. I _suspect_ this will lead to:
1. performance penality, and/or, worse,
2. possible deadlock in the kernel.

Is it something to worry about? Should users turn journalling off when mounting the sparseimage?

- Jay

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  • FJ de Kermadec photo FileVault and Journaled FS...
    2004-01-15 09:05:57  FJ de Kermadec | O'Reilly Blogger [View]

    Hi !

    Thanks for the kind words, I really do appreciate them !

    I do not think that there is anything to worry about. Indeed, file system journaling is handled by Mac OS X in a very efficient way and should not have any performance or stability impact on your installation.