From: Miguel <mmiranda@123.com.sv>
To: Vivek Khera <vivek@khera.org>
Cc: Postgresql Performance <pgsql-performance@postgresql.org>
Subject: Re: Best OS & Configuration for Dual Xeon w/4GB & Adaptec
Date: Mon, 20 Mar 2006 17:04:10 -0600
Message-ID: <441F34EA.6020100@123.com.sv> (raw)
In-Reply-To: <A6D4AE5F-A7EF-411A-A037-5E2080F643BE@khera.org>
References: <20060317221116.GA14661@juniper.net>
<8F6490E1-64E2-406B-A559-7DA8BA1EB197@khera.org>
<441F161D.7010502@123.com.sv>
<A6D4AE5F-A7EF-411A-A037-5E2080F643BE@khera.org>
Vivek Khera wrote:
>>> If you do put on FreeBSD 6, I'd love to see the output of "diskinfo
>>> - v -t" on your RAID volume(s).
>>>
>> Not directly related ...
>> i have a HP dl380 g3 with array 5i controlled (1+0), these are my
>> results
>> [...]
>> is this good enough?
>
>
> Is that on a loaded box or a mostly quiet box? Those number seem
> rather low for my tastes. For comparison, here are numbers from a
> Dell 1850 with a built-in PERC 4e/Si RAID in a two disk mirror. All
> numbers below are on mostly or totally quiet disk systems.
My numbers are on totally quiet box, i've just installed it.
>
> amrd0
> 512 # sectorsize
> 73274490880 # mediasize in bytes (68G)
> 143114240 # mediasize in sectors
> 8908 # Cylinders according to firmware.
> 255 # Heads according to firmware.
> 63 # Sectors according to firmware.
>
> Seek times:
> Full stroke: 250 iter in 0.756718 sec = 3.027 msec
> Half stroke: 250 iter in 0.717824 sec = 2.871 msec
> Quarter stroke: 500 iter in 1.972368 sec = 3.945 msec
> Short forward: 400 iter in 1.193179 sec = 2.983 msec
> Short backward: 400 iter in 1.322440 sec = 3.306 msec
> Seq outer: 2048 iter in 0.271402 sec = 0.133 msec
> Seq inner: 2048 iter in 0.271151 sec = 0.132 msec
> Transfer rates:
> outside: 102400 kbytes in 1.080339 sec = 94785
> kbytes/sec
> middle: 102400 kbytes in 1.166021 sec = 87820
> kbytes/sec
> inside: 102400 kbytes in 1.461498 sec = 70065
> kbytes/sec
>
>
Umm, in my box i see better seektimes but worst transfer rates, does it
make sense?
i think i have something wrong, the question i cant answer is what
tunning am i missing?
---
Miguel
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To: pgsql-performance@postgresql.org
Cc: mmiranda@123.com.sv, vivek@khera.org
Subject: Re: Best OS & Configuration for Dual Xeon w/4GB & Adaptec
In-Reply-To: <441F34EA.6020100@123.com.sv>
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