On Mon, May 17, 2010 at 6:25 AM, Andreas Gunnarsson <andr...@tiomat.net>wrote:
> I've got a home-storage-server setup with Opensolaris (currently dev build > 134) that is quickly running out of storage space, and I'm looking through > what kind of options I have for expanding it. > > I currently have my "storage-pool" in a 4x 1TB drive setup in RAIDZ1, and > have room for 8-9 more drives in the case/controllers. > Preferably I'd like to change it all to a RAIDZ2 with 12 drives, and 1 > hotspare, but that would require me to transfer out all the data to an > external storage, and then recreating a new pool, which would require me > buying some additional external storage that will not be used after I'm done > with the transfer. > > I could also add 2 more 4 drive vdevs to the current pool, but then I would > have 3 RAIDZ1 vdevs striped, and I'm not entirely sure that I'm comfortable > with that level of protection on the data. > > Another version would be creating a 6 drive RAIDZ2 pool, moving the data to > that one and the destroying the old pool and adding another 6 drive vdev to > the new pool (striped). > > So the question is what would you recommend for growing my storage space: > 1. Buying extra hardware to copy the data to, and rebuild the pool as a 12 > drive RAIDZ2. > 2. Move data to a 6 drive RAIDZ2 and then destroy the old pool and stripe > an additional RAIDZ2 vdevs. > 3. Stripe 2 additional RAIDZ1 4 drive vdevs. > 4. Something else. I'd go with option 2. Create a 6-drive raidz2 vdev in a separate pool. Migrate the data from the old pool to the new pool. Destroy the old pool. Create a second 6-drive raidz2 vdev in the new pool. Voila! You'll have a lot of extra space, be able to withstand up to 4 drive failures (2 per vdev), and it should be faster as well (even with the added overhead of raidz2). Option 3 would give the best performance, but you don't have much leeway in terms of resilver time if using 1 TB+ drives, and if a second drive fails while the first is resilvering ... Option 1 would be horrible in terms of performance. Especially resilver times, as you'll be thrashing 12 drives. -- Freddie Cash fjwc...@gmail.com
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