On Mon, 2 May 2005, Alan Cox wrote:
> On Llu, 2005-05-02 at 20:18, Grzegorz Kulewski wrote:
> > What about other filesystems? Does anybody know anwser for Reiserfs3,
> > Reiser4, JFS, XFS and any other popular server filesystems? I assume that
> > if log file is some block device (like partition) both O_SYNC and fsync
> > will work? What about ext2? What about some strange RAID/DM/NBD
> > configurations? (I do not know in advance what our customers will use so I
> > need portable method.)
>
> RAID does stripe sized rewrites so you get into the same situation as
> with actual disks - a physical media failure might lose you old data
> (but then if the disk goes bang so does the data...)
I hope I'm reading that wrong, and that rewriting a single sector of a
file doesn't result in r-a-w of the entire stripe. That would be a large
memory hit for filesystems with large stripes for mostly sequential i/o.
--
bill davidsen <[email protected]>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
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