On Tue, Sep 23, 2008 at 08:56:39AM +0200, Nils Goroll wrote: >> That case appears to be about trying to get a raidz sized properly >> against disks of different sizes. I don't see a similar issue for >> someone preferring a concat over a stripe. > > I don't quite understand your comment. > > The question I was referring to was from someone who wanted a > configuration which would optimally use the available physical disk > space. The configuration which would yield maximum net capacity was to > use concats, so IMHO this is a case where one might want a concat below a > vdev.
I assumed that was only necessary because they were trying to use a raidz. I don't see why a plain stripe would not yield the maximum capacity. > Were you asking for use cases of a concat at the pool layer? > > I think those exist when using RAID hardware where additional striping > can lead to an increase of concurrent I/O on the same disks or I/Os being > split up unnecessarily. All of this highly depends upon the > configuration. No, not necessarily. I can think of a couple of things where it might be useful. I was asking for the OP's particular need. -- Darren _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
