Hi Darren, >> http://www.opensolaris.org/jive/thread.jspa?messageID=271983񂙯 >> >> The case mentioned there is one where concatenation in zdevs would be > useful. > > 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. 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. Nils _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
