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From: "OxY" <oxy@field.hu>
To: "Pawel Jakub Dawidek" <pjd@FreeBSD.org>
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Date: Wed, 7 Dec 2005 19:39:37 +0100
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Cc: freebsd-geom@freebsd.org
Subject: Re: geom mirror write performance problem
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Sco root# gmirror remove gm0 ad2
Sco root# swapoff /dev/mirror/gm0s2b
Sco root# dd if=/dev/zero of=/dev/ad2s1b bs=1m count=1000
dd: /dev/ad2s1b: Operation not supported
Sco root# dd if=/dev/zero of=/dev/ad2s2b bs=1m count=1000
dd: /dev/ad2s2b: short write on character device
dd: /dev/ad2s2b: end of device
507+0 records in
506+1 records out
530972160 bytes transferred in 18.206418 secs (29164011 bytes/sec)
Sco root# dd if=/dev/zero of=/dev/mirror/gm0s2b bs=1m count=1000
dd: /dev/mirror/gm0s2b: short write on character device
dd: /dev/mirror/gm0s2b: end of device
507+0 records in
506+1 records out
530972160 bytes transferred in 19.109501 secs (27785768 bytes/sec)

>Actually it is possible... You said, when only one component is
>connected performance is fine.
>You can try something like this:
>
># gmirror remove gm0 ad2
># swapoff /dev/mirror/gm0s1b (if you have one)

----- Original Message ----- 
From: "Pawel Jakub Dawidek" <pjd@FreeBSD.org>
To: "OxY" <oxy@field.hu>
Cc: <freebsd-geom@freebsd.org>
Sent: Wednesday, December 07, 2005 7:08 PM
Subject: Re: geom mirror write performance problem