[OpenIndiana-discuss] RAIDZ performance

[Roy Sigurd Karlsbakk]

> RAID-Z2 is quite CPU intensive, since it switches from XOR parity (for
> RAID-Z1) to a Reed-Solomon error-correcting code (in order to be able
> to
> survive multiple drive failures). The N40L's piddly CPU (2 cores @
> 1.4GHz) probably doesn't like that very much. 30-50% idle means 1 core
> completely saturated and the other running up to ~50% saturation. Try
> to
> switch to RAID-Z1 and watch as your CPU utilization drops dramatically
> -
> that's the source of your pain.

Well, another source of pain will arise when he finds bad data on a drive while resilvering. Are you sure z2 uses reed-solomon? I thought it just used two-dimensional XOR like Raid-6

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Roy Sigurd Karlsbakk
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