[OpenIndiana-discuss] RAIDZ performance

[Timothy Coalson]

I think last time this was asked, the consensus was that the implementation
was based on linear feedback shift registers and xor, which happens to be a
reed-solomon code (not as clear on this part, but what matters is what it
is, not what it isn't).  Regardless, from reading the source previously, I
am fairly sure it operates bytewise, with xor for first syndrome (parity),
and LFSR and then xor for the other syndromes.

See
http://openindiana.org/pipermail/openindiana-discuss/2012-October/010419.html

Tim

On Thu, Feb 21, 2013 at 12:10 PM, Sašo Kiselkov <skiselkov.ml at gmail.com>wrote:

> On 02/21/2013 06:56 PM, Roy Sigurd Karlsbakk wrote:
> > Are you sure z2 uses reed-solomon? I thought it just used
> two-dimensional XOR like Raid-6
>
> Pretty sure, unless the documentation is lying:
>
>
> https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/fs/zfs/vdev_raidz.c#L38-L45
>
> Cheers,
> --
> Saso
>
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