Public bug reported:
Create a snapshot of a logical volume
mount the snapshot
Read an file on lsnapshot
Suffer an "input/output error"
read same file on the original, no error
root@mozy:# /sbin/lvcreate -L100G -c 64k -s -n checksnap /dev/optvg/optlv
Logical volume "checksnap" created
root@mozy:# mount /dev/mapper/optvg-checksnap /checksnap/
**** Read the original *****
root@mozy:# dd if=/opt/.databases/archive.db of=/dev/null bs=1M
20+1 records in
20+1 records out
21662720 bytes (22 MB) copied, 0.0267054 s, 811 MB/s
*** Fail to read the snapshot ***
root@mozy:# dd if=/checksnap/.databases/archive.db of=/dev/null bs=1M
dd: reading `/checksnap/.databases/archive.db': Input/output error
17+1 records in
17+1 records out
18329600 bytes (18 MB) copied, 8.30774 s, 2.2 MB/s
root@mozy:# lsb_release -rd
Description: Ubuntu 12.04.3 LTS
Release: 12.04
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.8.0-29-generic 3.8.0-29.42~precise1 [modified:
boot/vmlinuz-3.8.0-29-generic]
ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
Uname: Linux 3.8.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.4
Architecture: amd64
Date: Thu Sep 12 16:26:33 2013
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64
(20130820.1)
MarkForUpload: True
ProcEnviron:
LANGUAGE=en_CA:en
TERM=xterm-color
PATH=(custom, no user)
LANG=POSIX
SHELL=/bin/bash
SourcePackage: linux-lts-raring
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-lts-raring (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise
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https://bugs.launchpad.net/bugs/1224654
Title:
lvm snapshot read error
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