i don't think it's the same at all. I think it's about the same as filling a radiator in a car with oatmeal to make it stop leaking.
On Sun, Sep 6, 2009 at 6:26 PM, Bob Friesenhahn < bfrie...@simple.dallas.tx.us> wrote: > On Sun, 6 Sep 2009, Thomas Burgess wrote: > >> >> if you add a raidz group to a group of 3 mirrors, the entire pool slows >> down >> to the speed of the raidz..... >> >> while you technically CAN do it, it's a horrible idea. >> > > I don't think it is necessarily as horrid as you say. Zfs does distribute > writes to faster vdevs under heavy write load. There can be vdevs of > somewhat different type and size (e.g. raidz and raidz2) which behave > similarly enough to not cause much imbalance in the pool. > > Saying that mixing vdev types is horrid is similar in nature to saying that > not using the same type and model of drive throughout the pool is horrid. > If you added a raidz vdev to a pool already using raidz vdevs, but the new > drives are much faster than the existing drives, then the same sort of > imbalance exists. > > boB > -- > Bob Friesenhahn > bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ > GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ >
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