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LVM2: cannot perform lvreduce on logical volume

I have recently created a new logical volume on a freshly installed machine. I have successfully created an ext3 filesystem on it, and can mount and read/write files to it. However, I would now like to reduce the size of the logical volume. I have attempted to lvreduce it (and lvremove it) with the filesystem unmounted, but these commands yield the following error:

lvm> lvreduce -L -50G VolGroup00/LogVol06
  /dev/cdrom: open failed: Read-only file system
  WARNING: Reducing active logical volume to 156.53 GB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce LogVol06? [y/n]: y
  Reducing logical volume LogVol06 to 156.53 GB
  device-mapper: deps ioctl failed: Invalid argument
  _deps: task run failed for (253:6)
  Failed to add device (253:6) to dtree
  Failed to suspend LogVol06

Additionally, the following error shows up in /var/log/messages:

Jun 20 12:55:44 ripper kernel: device-mapper: one of name or uuid must be supplied, cmd(11)

I have run vgmknodes, but this does not appear to fix the problem.

I have the following structure for the Volume Group VolGroup00

[root ripper mapper]# lvs
  LV       VG         Attr   LSize   Origin Snap%  Move Log Copy%
  LogVol00 VolGroup00 -wi-ao   4.00G
  LogVol01 VolGroup00 -wi-ao   2.00G
  LogVol02 VolGroup00 -wi-ao   8.00G
  LogVol03 VolGroup00 -wi-ao   4.00G
  LogVol04 VolGroup00 -wi-ao   4.00G
  LogVol05 VolGroup00 -wi-ao   4.00G
  LogVol06 VolGroup00 -wi-a- 206.53G
[root ripper mapper]# pvs
  PV         VG         Fmt  Attr PSize   PFree
  /dev/sda2  VolGroup00 lvm2 a-     4.00G    0
  /dev/sda5  VolGroup00 lvm2 a-   228.53G    0

LogVol06 is the problematic volume.

System details

OS Version:

Linux version 2.6.9-5.ELsmp (bhcompile thor perf redhat com) (gcc version 3.4.3 20041212 (Red Hat 3.4.3-9.EL4)) #1 SMP Wed Jan 5 19:29:47 EST 2005

LVM Version:

[root ripper mapper]# rpm -qa | grep -i lvm

Other details possibly of use:

[root ripper mapper]# ls -l /dev/mapper
total 0
crw-------  1 root root  10, 63 Jun  9 13:37 control
brw-------  1 root root 253,  0 Jun  9 13:38 VolGroup00-LogVol00
brw-------  1 root root 253,  5 Jun  9 13:38 VolGroup00-LogVol01
brw-------  1 root root 253,  3 Jun  9 13:38 VolGroup00-LogVol02
brw-------  1 root root 253,  2 Jun  9 13:38 VolGroup00-LogVol03
brw-------  1 root root 253,  4 Jun  9 13:38 VolGroup00-LogVol04
brw-------  1 root root 253,  1 Jun  9 13:38 VolGroup00-LogVol05
brw-rw----  1 root disk 253,  6 Jun 19 12:37 VolGroup00-LogVol06

[root ripper mapper]# mount
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
usbfs on /proc/bus/usb type usbfs (rw)
/dev/sda3 on /boot type ext3 (rw)
none on /dev/shm type tmpfs (rw)
/dev/mapper/VolGroup00-LogVol05 on /home type ext3 (rw)
/dev/mapper/VolGroup00-LogVol03 on /tmp type ext3 (rw)
/dev/mapper/VolGroup00-LogVol02 on /usr type ext3 (rw)
/dev/mapper/VolGroup00-LogVol04 on /var type ext3 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)


# This is an example configuration file for the LVM2 system.
# It contains the default settings that would be used if there was no
# /etc/lvm/lvm.conf file.
# Refer to 'man lvm.conf' for further information including the file layout.
# To put this file in a different directory and override /etc/lvm set
# the environment variable LVM_SYSTEM_DIR before running the tools.

# This section allows you to configure which block devices should
# be used by the LVM system.
devices {

    # Where do you want your volume groups to appear ?
    dir = "/dev"

    # An array of directories that contain the device nodes you wish
    # to use with LVM2.
    scan = [ "/dev" ]

    # A filter that tells LVM2 to only use a restricted set of devices.
    # The filter consists of an array of regular expressions.  These
    # expressions can be delimited by a character of your choice, and
    # prefixed with either an 'a' (for accept) or 'r' (for reject).
    # The first expression found to match a device name determines if
    # the device will be accepted or rejected (ignored).  Devices that
    # don't match any patterns are accepted.

    # Be careful if there there are symbolic links or multiple filesystem
# entries for the same device as each name is checked separately against
    # the list of patterns.  The effect is that if any name matches any 'a'
# pattern, the device is accepted; otherwise if any name matches any 'r'
    # pattern it is rejected; otherwise it is accepted.

# Don't have more than one filter line active at once: only one gets used.

    # Run vgscan after you change this parameter to ensure that
    # the cache file gets regenerated (see below).
    # If it doesn't do what you expect, check the output of 'vgscan -vvvv'.

    # By default we accept every block device:
    filter = [ "a/.*/" ]

    # Exclude the cdrom drive
    # filter = [ "r|/dev/cdrom|" ]

    # When testing I like to work with just loopback devices:
    # filter = [ "a/loop/", "r/.*/" ]

    # Or maybe all loops and ide drives except hdc:
    # filter =[ "a|loop|", "r|/dev/hdc|", "a|/dev/ide|", "r|.*|" ]

    # Use anchors if you want to be really specific
    # filter = [ "a|^/dev/hda8$|", "r/.*/" ]

    # The results of the filtering are cached on disk to avoid
    # rescanning dud devices (which can take a very long time).  By
    # default this cache file is hidden in the /etc/lvm directory.
    # It is safe to delete this file: the tools regenerate it.
    cache = "/etc/lvm/.cache"

    # You can turn off writing this cache file by setting this to 0.
    write_cache_state = 1

    # Advanced settings.

    # List of pairs of additional acceptable block device types found
    # in /proc/devices with maximum (non-zero) number of partitions.
    # types = [ "fd", 16 ]

    # If sysfs is mounted (2.6 kernels) restrict device scanning to
    # the block devices it believes are valid.
    # 1 enables; 0 disables.
    sysfs_scan = 1	

    # By default, LVM2 will ignore devices used as components of
    # software RAID (md) devices by looking for md superblocks.
    # 1 enables; 0 disables.
    md_component_detection = 1

# This section that allows you to configure the nature of the
# information that LVM2 reports.
log {

    # Controls the messages sent to stdout or stderr.
    # There are three levels of verbosity, 3 being the most verbose.
    verbose = 0

    # Should we send log messages through syslog?
    # 1 is yes; 0 is no.
    syslog = 1

    # Should we log error and debug messages to a file?
    # By default there is no log file.
    #file = "/var/log/lvm2.log"

    # Should we overwrite the log file each time the program is run?
    # By default we append.
    overwrite = 0

# What level of log messages should we send to the log file and/or syslog? # There are 6 syslog-like log levels currently in use - 2 to 7 inclusive.
    # 7 is the most verbose (LOG_DEBUG).
    level = 0

    # Format of output messages
# Whether or not (1 or 0) to indent messages according to their severity
    indent = 1

# Whether or not (1 or 0) to display the command name on each line output
    command_names = 0

    # A prefix to use before the message text (but after the command name,
# if selected). Default is two spaces, so you can see/grep the severity
    # of each message.
    prefix = "  "

    # To make the messages look similar to the original LVM tools use:
    #   indent = 0
    #   command_names = 1
    #   prefix = " -- "

    # Set this if you want log messages during activation.
    # Don't use this in low memory situations (can deadlock).
    # activation = 0

# Configuration of metadata backups and archiving.  In LVM2 when we
# talk about a 'backup' we mean making a copy of the metadata for the
# *current* system.  The 'archive' contains old metadata configurations.
# Backups are stored in a human readeable text format.
backup {

    # Should we maintain a backup of the current metadata configuration ?
    # Use 1 for Yes; 0 for No.
    # Think very hard before turning this off!
    backup = 1

    # Where shall we keep it ?
    # Remember to back up this directory regularly!
    backup_dir = "/etc/lvm/backup"

    # Should we maintain an archive of old metadata configurations.
    # Use 1 for Yes; 0 for No.
    # On by default.  Think very hard before turning this off.
    archive = 1

    # Where should archived files go ?
    # Remember to back up this directory regularly!
    archive_dir = "/etc/lvm/archive"

    # What is the minimum number of archive files you wish to keep ?
    retain_min = 10

    # What is the minimum time you wish to keep an archive file for ?
    retain_days = 30

# Settings for the running LVM2 in shell (readline) mode.
shell {

    # Number of lines of history to store in ~/.lvm_history
    history_size = 100

# Miscellaneous global LVM2 settings
global {

    # The file creation mask for any files and directories created.
    # Interpreted as octal if the first digit is zero.
    umask = 077

    # Allow other users to read the files
    #umask = 022

    # Enabling test mode means that no changes to the on disk metadata
    # will be made.  Equivalent to having the -t option on every
    # command.  Defaults to off.
    test = 0

    # Whether or not to communicate with the kernel device-mapper.
    # Set to 0 if you want to use the tools to manipulate LVM metadata
    # without activating any logical volumes.
    # If the device-mapper kernel driver is not present in your kernel
    # setting this to 0 should suppress the error messages.
    activation = 1

    # If we can't communicate with device-mapper, should we try running
    # the LVM1 tools?
    # This option only applies to 2.4 kernels and is provided to help you
    # switch between device-mapper kernels and LVM1 kernels.
    # The LVM1 tools need to be installed with .lvm1 suffices
    # e.g. vgscan.lvm1 and they will stop working after you start using
    # the new lvm2 on-disk metadata format.
    # The default value is set when the tools are built.
    # fallback_to_lvm1 = 0

# The default metadata format that commands should use - "lvm1" or "lvm2".
    # The command line override is -M1 or -M2.
    # Defaults to "lvm1" if compiled in, else "lvm2".
    # format = "lvm1"

    # Location of proc filesystem
    proc = "/proc"

    # Type of locking to use. Defaults to file-based locking (1).
# Turn locking off by setting to 0 (dangerous: risks metadata corruption
    # if LVM2 commands get run concurrently).
    locking_type = 1

    # Local non-LV directory that holds file-based locks while commands are
# in progress. A directory like /tmp that may get wiped on reboot is OK.
    locking_dir = "/var/lock/lvm"

    # Other entries can go here to allow you to load shared libraries
# e.g. if support for LVM1 metadata was compiled as a shared library use
    #   format_libraries = "liblvm2format1.so"
    # Full pathnames can be given.

    # Search this directory first for shared libraries.
    #   library_dir = "/lib"

activation {
# Device used in place of missing stripes if activating incomplete volume.
    # For now, you need to set this up yourself first (e.g. with 'dmsetup')
    # For example, you could make it return I/O errors using the 'error'
    # target or make it return zeros.
    missing_stripe_filler = "/dev/ioerror"

    # Size (in KB) of each copy operation when mirroring
    mirror_region_size = 512

    # How much stack (in KB) to reserve for use while devices suspended
    reserved_stack = 256

    # How much memory (in KB) to reserve for use while devices suspended
    reserved_memory = 8192

    # Nice value used while devices suspended
    process_priority = -18

    # If volume_list is defined, each LV is only activated if there is a
    # match against the list.
    #   "vgname" and "vgname/lvname" are matched exactly.
    #   "@tag" matches any tag set in the LV or VG.
# "@*" matches if any tag defined on the host is also set in the LV or VG
    # volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]

# Advanced section #

# Metadata settings
# metadata {
    # Default number of copies of metadata to hold on each PV.  0, 1 or 2.
    # You might want to override it from the command line with 0
    # when running pvcreate on new PVs which are to be added to large VGs.

    # pvmetadatacopies = 1

    # Approximate default size of on-disk metadata areas in sectors.
    # You should increase this if you have large volume groups or
    # you want to retain a large on-disk history of your metadata changes.

    # pvmetadatasize = 255

    # List of directories holding live copies of text format metadata.
    # These directories must not be on logical volumes!
    # It's possible to use LVM2 with a couple of directories here,
    # preferably on different (non-LV) filesystems, and with no other
    # on-disk metadata (pvmetadatacopies = 0). Or this can be in
    # addition to on-disk metadata areas.
    # The feature was originally added to simplify testing and is not
    # supported under low memory situations - the machine could lock up.
    # Never edit any files in these directories by hand unless you
    # you are absolutely sure you know what you are doing! Use
    # the supplied toolset to make changes (e.g. vgcfgrestore).

    # dirs = [ "/etc/lvm/metadata", "/mnt/disk2/lvm/metadata2" ]

[root ripper mapper]# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      :                   Intel(R) Xeon(TM) CPU 3.80GHz
stepping        : 10
cpu MHz         : 3790.648
cache size      : 2048 KB
fpu             : yes
fpu_exception   : yes
cpuid level     : 3
wp              : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl est tm2 cid cx16 xtpr ts
bogomips        : 7520.25
clflush size    : 64
cache_alignment : 128
address sizes   : 36 bits physical, 48 bits virtual
power management:

Steve Phelps
Ripple Software Ltd.

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