|DMEVENTD(8)||System Manager's Manual||DMEVENTD(8)|
-dRepeat from 1 to 3 times ( -d, -dd, -ddd ) to increase the detail of debug messages sent to syslog. Each extra d adds more debugging information.
-fDon't fork, run in the foreground.
-hShow help information.
-lLog through stdout and stderr instead of syslog. This option works only with option -f, otherwise it is ignored.
-?Show help information on stderr.
-RReplace a running dmeventd instance. The running dmeventd must be version 2.02.77 or newer. The new dmeventd instance will obtain a list of devices and events to monitor from the currently running daemon.
-VShow version of dmeventd.
MirrorAttempts to handle device failure automatically. See lvm.conf(5).
RaidAttempts to handle device failure automatically. See lvm.conf(5).
SnapshotMonitors how full a snapshot is becoming and emits a warning to syslog when it exceeds 80% full. The warning is repeated when 85%, 90% and 95% of the snapshot is filled. See lvm.conf(5). Snapshot which runs out of space gets invalid and when it is mounted, it gets umounted if possible.
ThinMonitors how full a thin pool data and metadata is becoming and emits a warning to syslog when it exceeds 80% full. The warning is repeated when more then 85%, 90% and 95% of the thin pool is filled. See lvm.conf(5). When a thin pool fills over 50% (data or metadata) thin plugin calls configured dmeventd/thin_command with every 5% increase. With default setting it calls internal lvm lvextend --use-policies to resize thin pool when it's been filled above configured threshold activation/thin_pool_autoextend_threshold. If the command fails, dmeventd thin plugin will keep retrying execution with increasing time delay between retries upto 42 minutes. User may also configure external command to support more advanced maintenance operations of a thin pool. Such external command can e.g. remove some unneeded snapshots, use fstrim(8) to free recover space in a thin pool, but also can use lvextend --use-policies if other actions have not released enough space. Command is executed with environmental variable LVM_RUN_BY_DMEVENTD=1 so any lvm2 command executed in this environment will not try to interact with dmeventd. To see the fullness of a thin pool command may check these two environmental variables DMEVENTD_THIN_POOL_DATA and DMEVENTD_THIN_POOL_METADATA. Command can also read status with tools like lvs(8).
- Variable is set by thin plugin and is available to executed program. Value present actual usage of thin pool data volume. Variable is not set when error event is processed.
- Variable is set by thin plugin and is available to executed program. Value present actual usage of thin pool metadata volume. Variable is not set when error event is processed.
- Variable is set by thin plugin to prohibit recursive interation with dmeventd by any executed lvm2 command from a thin_command environment.
|DM TOOLS 2.02.179(2) (2018-06-18)||Red Hat Inc|