Bug#549691:

James Robertson j at mesrobertson.com
Wed Aug 21 00:34:54 UTC 2013


I am using a new up to date Wheezy system and was having very poor
success with lvmremove - specifically with mylvmbackup.  I needed this
to be reliable and it was probably failing roughly 70-80% of the time.

As a test I built the version in Sid (as of 21/08/2013) on my Wheezy
machine and this appears to have solved it.

I elaborated on Anis' test as follows so I could emulate closely what
mylvmbackup was doing

#!/bin/bash

for i in $(seq 1 50) ; do
    echo -n "[$i] "
    date
    lvcreate -n mysql_snapshot -L 512m -s vgedJY67/mysql || break
    mount /dev/vgedJY67/mysql_snapshot /mnt/mysql_snapshot && echo
"Mounted /mnt/mysql_snapshot" || break
    tar -czf /tmp/mysql.tar.gz /mnt/mysql_snapshot 2> /dev/null &&
echo "Backed up MYSQL" || break
    umount /mnt/mysql_snapshot && echo "Unmounted /mnt/mysql_snapshot" || break
    lvremove -f vgedJY67/mysql_snapshot || break
    sleep 1
done

Using the version in Wheezy I ran this script 10 times and the
furthest it got was to the 3rd loop with it mostly failing on the 1st!
 Terrible...

After using the Sid version (after a reboot) it seems to work 100%.  I
decided to up the retries of the loop to 500 just to be certain.  It
passed all 500... Great!


-- System Information:
Debian Release: 7.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/1 CPU core)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages lvm2 depends on:
ii  dmsetup                   2:1.02.77-5.jamesr1
ii  initscripts               2.88dsf-41
ii  libc6                     2.13-38
ii  libdevmapper-event1.02.1  2:1.02.77-5.jamesr1
ii  libdevmapper1.02.1        2:1.02.77-5.jamesr1
ii  libreadline5              5.2+dfsg-2~deb7u1
ii  libudev0                  175-7.2
ii  lsb-base                  4.1+Debian8+deb7u1


-- Versions:

> apt-cache policy libdevmapper1.02.1 libdevmapper-event1.02.1 dmsetup lvm2
libdevmapper1.02.1:
  Installed: 2:1.02.77-5.jamesr1
  Candidate: 2:1.02.77-5.jamesr1
  Version table:
 *** 2:1.02.77-5.jamesr1 0
        100 /var/lib/dpkg/status
     2:1.02.74-7 0
        500 http://ftp.iinet.net.au/debian/debian/ wheezy/main amd64 Packages
libdevmapper-event1.02.1:
  Installed: 2:1.02.77-5.jamesr1
  Candidate: 2:1.02.77-5.jamesr1
  Version table:
 *** 2:1.02.77-5.jamesr1 0
        100 /var/lib/dpkg/status
     2:1.02.74-7 0
        500 http://ftp.iinet.net.au/debian/debian/ wheezy/main amd64 Packages
dmsetup:
  Installed: 2:1.02.77-5.jamesr1
  Candidate: 2:1.02.77-5.jamesr1
  Version table:
 *** 2:1.02.77-5.jamesr1 0
        100 /var/lib/dpkg/status
     2:1.02.74-7 0
        500 http://ftp.iinet.net.au/debian/debian/ wheezy/main amd64 Packages
lvm2:
  Installed: 2.02.98-5.jamesr1
  Candidate: 2.02.98-5.jamesr1
  Version table:
 *** 2.02.98-5.jamesr1 0
        100 /var/lib/dpkg/status
     2.02.95-7 0
        500 http://ftp.iinet.net.au/debian/debian/ wheezy/main amd64 Packages



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