DMEVENT_TOOL(8)DMEVENT_TOOL(8)NAME
dmevent_tool - A utility used to load a DSO into dmeventd and (un)register devices with it for monitoring
SYNOPSIS
dmevent_tool -[Vhmru] {RAID device name} {DSO Name}
DESCRIPTION
dmevent_tool is a userspace utility used to register/unregister DSOs with the daemon dmeventd.
If used with the -m command line parameter users can display all of the actively dmeventd monitored devices.
OPTIONS -V Show version of dmevent_tool
-{h/?} Show this help information
-m[r|u] List all currently active device mapper devices
and their current status with dmeventd
for registered (-r)/unregistered (-m) devices
Syntax: dmevent_tool -m[u|r]
-a[r|u] Same as -m, but for devices with UUID only!
Syntax: dmevent_tool -a[u|r]
-r Register a device with dmeventd
Syntax: dmevent_tool -r <device name> <path to DSO library>
Example: dmevent_tool -r isw_abcdeh_Volume0 libdmraid-events.so
-u Unregister a device with dmeventd
Syntax: dmevent_tool -u <device name> [<path to DSO library>]
Example: dmevent_tool -u isw_abcdefgh_Volume0
EXAMPLES
dmevent_tool -m is used to display all of the actively monitored devices
dmevent_tool -m
Device Name: isw_defeaigdde_Volume0_dmraid00
Registered DSO: libdmraid-events.so
UUID: isw_defeaigdde_Volume0_dmraid00
status: Active
major device #: 253
minor device #: 0
read only device: No
number of recorded kernel events: 0
SATA drives in this volume group: /dev/sdb /dev/sdc
dmevent_tool -r is used to register a volume group device with dmeventd
dmevent_tool -r isw_defeaigdde_Volume0_dmraid00 libdmraid-events.so
dmevent_tool -u is used to unregister a volume group from dmeventd
dmevent_tool -u isw_defeaigdde_Volume0_dmraid00
DIAGNOSTICS
dmevent_tool returns an exit code of 0 for success or 1 for error.
AUTHOR
Brian Wood <brian.j.wood@intel.com>
Brian Wood 1.0.0.rc3 DMEVENT_TOOL(8)
Check Out this Related Man Page
LVCHANGE(8) System Manager's Manual LVCHANGE(8)NAME
lvchange - change attributes of a logical volume
SYNOPSIS
lvchange [--addtag Tag] [-A|--autobackup y|n] [-a|--available y|n|ey|en|ly|ln] [--alloc AllocationPolicy] [-C|--contiguous y|n]
[-d|--debug] [--deltag Tag] [--resync] [-h|-?|--help] [--ignorelockingfailure] [--ignoremonitoring] [--monitor {y|n}] [--poll {y|n}]
[--sysinit] [--noudevsync] [-M|--persistent y|n] [--minor minor] [-P|--partial] [-p|--permission r|rw] [-r/--readahead ReadAheadSec-
tors|auto|none] [--refresh] [-t|--test] [-v|--verbose] LogicalVolumePath [LogicalVolumePath...]
DESCRIPTION
lvchange allows you to change the attributes of a logical volume including making them known to the kernel ready for use.
OPTIONS
See lvm for common options.
-a, --available y|n|ey|en|ly|ln
Controls the availability of the logical volumes for use. Communicates with the kernel device-mapper driver via libdevmapper to
activate (-ay) or deactivate (-an) the logical volumes.
If clustered locking is enabled, -aey will activate exclusively on one node and -aly will activate only on the local node. To deac-
tivate only on the local node use -aln. Logical volumes with single-host snapshots are always activated exclusively because they
can only be used on one node at once.
-C, --contiguous y|n
Tries to set or reset the contiguous allocation policy for logical volumes. It's only possible to change a non-contiguous logical
volume's allocation policy to contiguous, if all of the allocated physical extents are already contiguous.
--resync
Forces the complete resynchronization of a mirror. In normal circumstances you should not need this option because synchronization
happens automatically. Data is read from the primary mirror device and copied to the others, so this can take a considerable amount
of time - and during this time you are without a complete redundant copy of your data.
--minor minor
Set the minor number.
--monitor y|n
Start or stop monitoring a mirrored or snapshot logical volume with dmeventd, if it is installed. If a device used by a monitored
mirror reports an I/O error, the failure is handled according to mirror_image_fault_policy and mirror_log_fault_policy set in
lvm.conf.
--poll y|n
Without polling a logical volume's backgrounded transformation process will never complete. If there is an incomplete pvmove or
lvconvert (for example, on rebooting after a crash), use --poll y to restart the process from its last checkpoint. However, it may
not be appropriate to immediately poll a logical volume when it is activated, use --poll n to defer and then --poll y to restart the
process.
--sysinit
Indicates that lvchange(8) is being invoked from early system initialisation scripts (e.g. rc.sysinit or an initrd), before write-
able filesystems are available. As such, some functionality needs to be disabled and this option acts as a shortcut which selects an
appropriate set of options. Currently this is equivalent to using --ignorelockingfailure, --ignoremonitoring, --poll n and setting
LVM_SUPPRESS_LOCKING_FAILURE_MESSAGES environment variable.
--noudevsync
Disable udev synchronisation. The process will not wait for notification from udev. It will continue irrespective of any possible
udev processing in the background. You should only use this if udev is not running or has rules that ignore the devices LVM2 cre-
ates.
--ignoremonitoring
Make no attempt to interact with dmeventd unless --monitor is specified. Do not use this if dmeventd is already monitoring a
device.
-M, --persistent y|n
Set to y to make the minor number specified persistent.
-p, --permission r|rw
Change access permission to read-only or read/write.
-r, --readahead ReadAheadSectors|auto|none
Set read ahead sector count of this logical volume. For volume groups with metadata in lvm1 format, this must be a value between 2
and 120 sectors. The default value is "auto" which allows the kernel to choose a suitable value automatically. "None" is equiva-
lent to specifying zero.
--refresh
If the logical volume is active, reload its metadata. This is not necessary in normal operation, but may be useful if something has
gone wrong or if you're doing clustering manually without a clustered lock manager.
Examples
"lvchange -pr vg00/lvol1" changes the permission on volume lvol1 in volume group vg00 to be read-only.
SEE ALSO lvm(8), lvcreate(8), vgchange(8)Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) LVCHANGE(8)