On Sat, Mar 28, 2009 at 10:29 AM, Bob Friesenhahn < bfrie...@simple.dallas.tx.us> wrote:
> On Sat, 28 Mar 2009, Peter Tribble wrote: > >> >> The choice of raidz1 versus raidz2 is another matter. Given that you've >> already got raidz1, and you can't (yet) grow that or expand it to raidz2, >> then there doesn't seem to be much point to having the second half of your >> storage being more protected. >> > > There is no harm from using a raidz2 vdev even if an existing vdev is only > raidz1. If raidz2 is an available option then it is wise to choose it. Of > course starting out with raidz2 would have been even better. > > Bob > #1: yes, there is harm as he may very well run into inconsistent performance which is a complete PITA to track down when you've got differing raidtypes underlying a volume. #2: raidz2 isn't always "wise" to choose. It's a matter of performance, space, security requirements. 7+1 is fine for raidz1. If he was pushing 10 data disks that'd be another story. --Tim
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