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From: Luke Lonergan <llonergan@greenplum.com>
To: Jignesh Shah <J.K.Shah@Sun.COM>
Cc: Juan Casero <caseroj@comcast.net>
Cc: pgsql-performance@postgresql.org
Subject: Re: PostgreSQL and Ultrasparc T1
Date: Mon, 19 Dec 2005 17:37:35 -0800
Message-ID: <BFCCA05F.16D3D%llonergan@greenplum.com> (raw)
In-Reply-To: <fcc4f7c276bc.43a6cfe2@sun.com>

Jignesh,

On 12/19/05 12:21 PM, "Jignesh Shah" <J.K.Shah@Sun.COM> wrote:

>                     extended device statistics
>     r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
>     0.8   14.0    0.0    0.0  0.0  0.3    0.0   17.8   0   4 c3t0d0
>    91.4    0.0   91.4    0.0  0.0  1.0    0.0   10.5   0  96 c0t40d0
>    96.0    0.0   96.0    0.0  0.0  1.0    0.0   10.0   0  96 c5t40d1
>    95.8    0.0   95.8    0.0  0.0  1.0    0.0   10.0   0  96 c0t40d1
>    96.8    0.0   96.8    0.0  0.0  1.0    0.0    9.9   0  96 c5t40d0
>    84.6    0.0   84.6    0.0  0.0  1.0    0.0   11.4   0  96 c4t46d1
>    85.6    0.0   85.6    0.0  0.0  1.0    0.0   11.2   0  96 c4t46d0
>    85.2    0.0   85.2    0.0  0.0  1.0    0.0   11.3   0  96 c2t46d1
>    85.4    0.0   85.4    0.0  0.0  1.0    0.0   11.3   0  96 c2t46d0

Doh!  Forget my last message, each of these is a single drive.

Wacky layout though - it looks like c0,c2,c3,c4,c5 - is that 5 controllers
there?

Also - what are the RAID options on this unit?

To get optimal performance on an 8 core unit, would we want to map 1 active
process to each of these drives?  Can the CPU run all 8 threads
simultaneously?

- Luke

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