lvmpolld: add page

pages/linux/lvmpolld.md

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+# lvmpolld
+
+> LVM poll daemon that supervises long-running LVM operations.
+> More information: <https://manned.org/lvmpolld>.
+
+- Start the daemon in the foreground:
+
+`lvmpolld {{[-f|--foreground]}}`
+
+- Start in the foreground with debug logging:
+
+`lvmpolld {{[-f|--foreground]}} {{[-l|--log]}} debug`
+
+- Set the idle shutdown timeout (seconds):
+
+`lvmpolld {{[-t|--timeout]}} {{300}}`
+
+- Use a custom socket path:
+
+`lvmpolld {{[-s|--socket]}} {{/tmp/lvmpolld.socket}}`
+
+- Use a custom PID file:
+
+`lvmpolld {{[-p|--pidfile]}} {{/tmp/lvmpolld.pid}}`
+
+- Dump the current state:
+
+`lvmpolld --dump`