On Tue, May 28, 2013 at 10:00 AM, Matt Garman <matthew.garman@xxxxxxxxx> wrote: > On Mon, May 27, 2013 at 09:02:08PM +0200, Roy Sigurd Karlsbakk wrote: >> Short answer: ZFS will guarantee the data is free of errors, but >> MD will give you the flexibility of moving between RAID levels and >> adding drives to existing RAIDs. I have been working with ZFS with >> some 400TB of storage, and I considered using it for my home >> server, but chose MD because of the flexibility in there. ZFS >> requires you to plan your setup. It allows you to add VDEVs, but >> data isn't balanced over the VDEVs. That will required block >> pointer rewrite, something that's been talked about for at least >> four years, but yet hasn't surfaced. > > > In the raid-10 case, does Linux MD automatically "reblance" the > data? I could be wrong, but my understanding is that it will let > you grow the array, but in the same way that ZFS would (for raid10 > anyway): the extra space is there, but not striped across the > original disks. IIRC, as of March or so of last year (2012), kernels gained the ability to grow MD RAID10 arrays *provided* they are not using the "far" offset layout (sadly, my favorite). -- Jon -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
