Hi I have RAID 10 using 4 times 500GB drives (1TB of storage). Is it possible to create another RAID 10 with 4 times 250GB drives (500GB of storage) and then combine those two RAIDs to one file system so that I would be able to get 1.5TB? If I create one RAID 10 with all 8 drives I would only be able to use 8 times 250GB /2 = 1TB, right? Thanks, Gal -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
I''m sure this is possible if you use /dev/md''s, but doesn''t this basically make the redundancy of the raid10 useless? On Wed, Feb 16, 2011 at 8:50 PM, Gal Buki <buki@torus.ch> wrote:> Hi > > I have RAID 10 using 4 times 500GB drives (1TB of storage). > Is it possible to create another RAID 10 with 4 times 250GB drives (500GB of > storage) and then combine those two RAIDs to one file system so that I would > be able to get 1.5TB? > > If I create one RAID 10 with all 8 drives I would only be able to use 8 > times 250GB /2 = 1TB, right? > > Thanks, > Gal > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, Feb 16, 2011 at 10:50:57PM +0200, Gal Buki wrote:> I have RAID 10 using 4 times 500GB drives (1TB of storage). > Is it possible to create another RAID 10 with 4 times 250GB drives > (500GB of storage) and then combine those two RAIDs to one file > system so that I would be able to get 1.5TB? > > If I create one RAID 10 with all 8 drives I would only be able to > use 8 times 250GB /2 = 1TB, right?No, just add the new drives to the existing btrfs pool, and run a balance, and you should get a btrfs filesystem with 1.5TB of mirrored/striped storage. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk == PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Anyone who claims their cryptographic protocol is secure is --- either a genius or a fool. Given the genius/fool ratio for our species, the odds aren''t good.