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Comment by HorstG

6 years ago

Group your disks in bunches of 4 or 5 per Raidz, no more. And have them on the same controller or SAS-expander per bunch. Use striping over the bunches. Don't use hotspares, for performance maybe avoid RAIDz6. Try out and benchmark a lot. Get more RAM, lots more RAM.

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HorstG

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timc3  6 years ago

Back when I setup my last ZFS running on OmniOS 5 disks was not optimal, though i am running RAIDZ2

But yes, lots of RAM

  • HorstG  6 years ago

    I think the optimal number of RAIDz5 disks is 3, if you just want performance. But this wastes lots of space of course. Also, the number of SAS/SATA-channels per controller and the topology of expanders is important. Thats why I don't think there is a recipy, you have to try it out for each new kind of hardware.

    And as another thread pointed out, stripe size is also an important parameter.