Skip site navigation (1)Skip section navigation (2)
Date:      Mon, 14 Oct 2013 14:51:55 -0400 (EDT)
From:      Daniel Feenberg <>
To:        Bruce Cran <>
Cc:        David Demelier <>, Adam Vande More <>, Brad Mettee <>, FreeBSD Questions <>, CeDeROM <>
Subject:   Re: SU+J Lost files after a power failure
Message-ID:  <>
In-Reply-To: <>
References:  <> <l3gc7e$c91$> <> <> <> <> <> <> <>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help

On Mon, 14 Oct 2013, Bruce Cran wrote:

> On 10/14/2013 6:16 PM, CeDeROM wrote:
>> Isn't there Journal to prevent and reverse such damage?
> Unlike other journaling filesystems, UFS+J only protects the metadata, not 
> the data itself - i.e. I think it ensures you won't have to run a manual 
> fsck, but just like plain old UFS files may be truncated as the journal is 
> replayed.

This discussion skirts the critical issue - are files that are not open 
for writing endangered? No description of the uses of journaling can be 
considered informative if it doesn't address that explicitly. As a naive 
user I have always assumed that once closed, a file was invulnerable to 
improper shutdowns, but this discussion shakes that belief.

I expect the answer may be different for SSD and spinning disks.

dan feenberg

Want to link to this message? Use this URL: <>