Vanja <vanjab <at> gmail.com> writes: > > And finally, if this is the case, is it possible to make an array with > 3 drives, and then add the mirror later?
I assume you are asking if it is possible to create a temporary 3-way raidz, then transfer your data to it, then convert it to a 4-way raidz ? No it is not possible. However here is one solution (let's call your 4 drives A, B, C and D -- your current data is on D). 1. Slice up A, B, C in 2 halves each: A1 and A2, B1 and B2, C1 and C2. 2. Create a 3-way raidz on A2, B2 and C2. 3. Copy your data from D to the 3-way raidz. 4. Slice up D in 2 halves: D1 and D2. 5. Create a 4-way raidz on A1, B1, C1, D1. 6. Copy your data from the 3-way raidz to the 4-way raidz. 7. Destroy the A2, B2, C2, D2 slices. 8. Grow A1, B1, C1, D1 to extend over the remaining disk space. 9. Export and reimport the 4-way raidz to make it register the extra space. Yes that's a lot of steps. But that's also the safest solution as your data would never transit on a (temporarily) degraded raidz (as it is possible for example on Linux by creating a raid5 MD with one "missing" component). -marc _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
