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 (8.12.11.20060308/8.11.6) with ESMTP id k2OEQRko016262 for ; Fri, 24 Mar 2006 09:26:27 -0500 Received: from zproxy.gmail.com (zproxy.gmail.com [64.233.162.200]) by mx3.redhat.com (8.13.1/8.13.1) with ESMTP id k2OEQLkI013027 for ; Fri, 24 Mar 2006 09:26:21 -0500 Received: by zproxy.gmail.com with SMTP id m7so822953nzf for ; Fri, 24 Mar 2006 06:26:20 -0800 (PST) Message-ID: <2c51ecee0603240626m5c118d17h63bb9a66ef906fc1@mail.gmail.com> Date: Fri, 24 Mar 2006 09:26:19 -0500 From: "Raghuram Devarakonda" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_12524_11031534.1143210379803" Subject: [linux-lvm] Problem in reading snapshots.... 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: To: linux-lvm@redhat.com ------=_Part_12524_11031534.1143210379803 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi, I am able to create LVM snapshot but reading it is failing most of the times. The failure occurs at random offsets. Occassionally, the read completes. Whenever the read fails, I see messages similar to following in /var/log/messages: "Buffer I/O error on device dm-6, logical block 1938043" There are other messages: "/etc/hotplug/block.agent[16978]: try 1 while waiting for /block/dm-4's bus_id" The system is a SLES9 SP3. # uname -a Linux raaga 2.6.5-7.244-default #1 Mon Dec 12 18:32:25 UTC 2005 i686 i686 i386 GNU/Linux # rpm -qa | grep -i lvm lvm2-2.01.14-3.6 I tested reads with "dd" command. I would appreciate it if someone can help me in resolving this problem. Please let me know if more details are needed. Thanks in advance, Raghu. ------=_Part_12524_11031534.1143210379803 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Hi,

I am able to create LVM snapshot but reading it is failing m= ost of the times. The failure occurs at random offsets. Occassionally, the = read completes. Whenever the read fails, I see messages similar to followin= g in /var/log/messages:

"Buffer I/O error on device dm-6, logical block 1938043"<= br>
There are other messages:

"/etc/hotplug/block.agent[1697= 8]: try 1 while waiting for /block/dm-4's bus_id"

The system is= a SLES9 SP3.

# uname -a
Linux raaga 2.6.5-7.244-default #1 Mon Dec 12 18:32:2= 5 UTC 2005 i686 i686 i386 GNU/Linux

# rpm -qa | grep -i lvm
lvm2-= 2.01.14-3.6

I tested reads with "dd" command.

I would appreciate it if someone can help me in resolving this problem. Ple= ase let me know if more details are needed.

Thanks in advance,
Ra= ghu.








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