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From: Joshua Boyd <boydjd@jbip.net>
Date: Wed, 4 Aug 2010 22:13:36 -0400
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To: "Alex V. Petrov" <alexvpetrov@gmail.com>
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Subject: Re: zpool - low speed write
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On Wed, Aug 4, 2010 at 10:13 AM, Alex V. Petrov <alexvpetrov@gmail.com>wrote:

> interesting results:
>
> From single-UDF-disk to pool:
> $ dd if=petrovs-disk1.iso of=/tank/petrovs-disk1.iso bs=1M
> 3545+1 records in
> 3545+1 records out
> 3718002688 bytes transferred in 438.770195 secs (8473690 bytes/sec)
>
> From single-UDF-disk to null:
> $ dd if=petrovs-disk1.iso of=/dev/null bs=1M
> 3545+1 records in
> 3545+1 records out
> 3718002688 bytes transferred in 83.304575 secs (44631435 bytes/sec)
> ------
> Alex V. Petrov
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>

What controllers are you using?

What's the results of dd if=/dev/ada4 of=/dev/null bs=1M count=100 ?

Have you tried switching to the ad driver? Maybe ada is buggy on your
hardware.

-- 
Joshua Boyd
JBipNet

E-mail: boydjd@jbip.net

http://www.jbip.net