Hello everyone,
I am in a situation where I need a way to make a practically
incorruptible file system upon power loss. I know I can make this with a
read-only fs + aufs + tmpfs, but it looks that nilfs2 may do this alone.
Situation: I have few friends/clients whom I give a Raspberry Pi (RPi)
with XBMC (actually, Xbian) for a home theatre. The RPi is powered by
the TV USB port, and when the TV goes down, the PRi loses power. The
/boot and / file systems are read only; that can be done. The /home
however has to be writable - users may (rarely) change some
configuration there. So, I put a nilfs2 there. The fs is ~7G on a 8G SSD
card, full < 10% and almost no writes come ever.
What I need is the fs to never crash in such conditions. One idea to
guarantee consistency is, I think, upon power on to mount an old
checkpoint - say, 1-2 checkpoints back from the log end. It does not
matter if the last written data is lost.
I have no conclusive data, but my tests with random power pull-of show
very good corruption resiliency up to now, but is there a way to
guarantee that the file system will be truly incorruptible? Again, the
use is very light and the SSD card partition will likely never fill.
All suggestions appreciated,
George.
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