From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.11.6/8.11.6) with ESMTP id jAJ9vAV01985 for ; Sat, 19 Nov 2005 04:57:10 -0500 Received: from xproxy.gmail.com (xproxy.gmail.com [66.249.82.196]) by mx3.redhat.com (8.13.1/8.13.1) with ESMTP id jAJ9v4cV019718 for ; Sat, 19 Nov 2005 04:57:04 -0500 Received: by xproxy.gmail.com with SMTP id t11so341850wxc for ; Sat, 19 Nov 2005 01:57:04 -0800 (PST) Message-ID: <539807300511190157j5699c837r@mail.gmail.com> Date: Sat, 19 Nov 2005 17:57:04 +0800 From: Lee Rocky MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: 8bit Subject: [linux-lvm] about snapshot performance Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii" To: LVM general discussion and development I found some reference that discuss about LVM1 volume with snapshot performance https://www.redhat.com/archives/linux-lvm/2003-January/msg00173.html https://www.redhat.com/archives/linux-lvm/2003-January/msg00239.html and I follow the steps with my LVM2 command "sync ; time dd if=/dev/zero of=filename bs=1024k count=2000" the result is dd write on LV without snapshots = 150MB/s dd write on LV with 1 snapshots = 4.42 MB/s I got very slow write performace. but read has no problem. is this result work as expected? KERNEL 2.6.13 LVM2 = 2.01.15 Library : 1.01.05 Driver version: 4.4.0