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Date: Thu, 21 Jan 2016 19:12:02 -0500
From: Mason Loring Bliss <mason@blisses.org>
To: Jov <zhao6014@gmail.com>
Cc: freebsd-questions@freebsd.org
Subject: Re: ZFS performance help sought
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On Fri, Jan 22, 2016 at 08:06:57AM +0800, Jov wrote:

> sys% 62.6 is wired，what ie your disk type？please post the output of iostat
> -x 1

This is with the current test transfer going, with the settings noted
previously:

                        extended device statistics  
device     r/s   w/s    kr/s    kw/s qlen svc_t  %b  
ada0     182.6   0.0 23369.6     0.0    1   3.2  30 
ada1     212.5   0.0 27200.6     0.0    0   3.1  33 
ada2       0.0 486.9     0.0 61652.4    0   4.5  64 
ada3       0.0 798.1     0.0 101236.2    1   4.7  75 
ada4       0.0   0.0     0.0     0.0    0   0.0   0 
da0        0.0   0.0     0.0     0.0    0   0.0   0 
cd0        0.0   0.0     0.0     0.0    0   0.0   0 

the sending pool is a mirror on ada0,1, and the receiving pool in this case
is a mirror on ada2,3.

The disks in question:

ada0: <ST500DM002-1BD142 KC43> ATA8-ACS SATA 3.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada1: <WDC WD5000AAKX-22ERMA0 17.01H17> ATA8-ACS SATA 3.x device
ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada2: <Hitachi HDS721010KLA330 GKAOA9DA> ATA-7 SATA 2.x device
ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada3: <WDC WD10EZEX-00BN5A0 01.01A01> ACS-2 ATA SATA 3.x device
ada3: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)

-- 
Mason Loring Bliss   ((  "In the drowsy dark cave of the mind dreams
mason@blisses.org     ))  build  their nest  with fragments  dropped
http://blisses.org/  ((   from day's caravan." - Rabindranath Tagore