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Alan E. Davis wrote:
> I noticed recently that on at least one of the machines on which I have
> Ubuntu 8.04 installed, new options in /etc/fstab---in particular, relatime.
> I am inquiring whether there may be any reason to fear loss of data due to
> this new option, and also I want to ask about nodirratime.
>
> Google took me to a kernel mailing list discussion about these optoins. I
> understodd that disk performance is vastly enhanced by using relatime as an
> option to mount. Also, nodiratime, and I think also noatime, were
> mentioned. The discussion made the point that especially on journaling file
> systems, wirtes to disk are extremely frequent, and that relative would
> reduce the number of writes, and could, it was posted, increase disk
> performace by up to 40%! I assume that the Ubuntu developers have done this
> with good reason, perhaps this being one reason that Ubuntu is getting high
> marks for performance.
>
> So I set up the ext3 partitions with relatime, and also one or two
> partitions with nodiratime, in addition to relatime. I may have blundered
> in this.
>
> I lost an entire directory from my main disk drive, a SATA disk. It's not a
> large directory, but I was storing some of my more recent work---a large
> number of PDFs scanned with gscan2pdf (which I highly recommend, by the
> way). The first time I lost the directory, I found it entire, in another
> directory as a subdir. It has disappeared from "Places", into which I had
> dragged it into the bookmarks list. So I moved it back to where it had
> been.
>
> About three days later, laden with even more files, it disappeared
> completely. I cannot seem to find it, and I do not posses magic strong
> enough to raise it from the dead.
>
> Hence I am posting to this list to ask for further information about the
> parameters I mentioned.
>
>  - is there any way that use of these parameters would lead to loss of a
> directory?
>  - Any ideas?
>  - Would the use of nodiratime have any possible deleterious effects, of
> the nature of the one I have described, due to lack of writing to disk
> sufficiently?
>  - The power here on my island is really horrible, and I am not careful
> enough to clean it up. We have power outaged several times a week, and I
> have been living at a compound where the backup generator power is not up to
> standard. Could these factors lead to the sympom I have described?
>
>
> Thank you for any suggestions.
>
> Alan
>
>
Highly doubtful that these parameters are causing data loss as you
describe it.

Try:

user@(protected)

in the root directory, ie. the top directory.

this may take a while.


Dave
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