RELENG_7 heavy disk = system crawls

[Bill Moran]

grarpamp <grarpamp at gmail.com> wrote:
>
> > cards aren't going to help with zfs.
> 
> No, but for geli hifn(4) crypto(4)/(9), geli(8) might work
> if aes-cbc is indeed the mode geli uses. See the source I guess.

Note that only the most expensive cards are faster than a CPU.  Unless you've
got a very large budget, you'll get more bang for your buck out of adding CPUs
to the unit.  During crypto ops, the system will have a spare CPU to use to
encrypt, and when not doing crypto ops, you have the added benefit of more
processing power for apps.

Additionally, support for FreeBSD is spotty.  And we've seen cards that work in
FreeBSD, but do so at far below their claimed throughput.  There are apparently
some inefficiencies in the drivers.

-- 
Bill Moran
Collaborative Fusion Inc.

wmoran at collaborativefusion.com
Phone: 412-422-3463x4023

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