[linux-lvm] lvm2 low space handling

[Zdenek Kabelac]

Dne 7.10.2014 v 23:07 Oliver Rath napsal(a):
> Hi list,
>
> how can I get some email, if a thin pool runs full? On my syslog i found
> the following messages:
>
>
> Oct  7 21:29:25 dmicn20 kernel: [1115276.145019] device-mapper: thin:
> 252:13: reached low water mark for metadata device: sending event.
> Oct  7 21:29:33 dmicn20 kernel: [1115284.693816] device-mapper: thin:
> 252:13: reached low water mark for metadata device: sending event.
> Oct  7 21:29:35 dmicn20 kernel: [1115286.086837] device-mapper: thin:
> 252:13: reached low water mark for metadata device: sending event.
> Oct  7 21:29:36 dmicn20 kernel: [1115287.369534] device-mapper: thin:
> 252:13: reached low water mark for metadata device: sending event.
> Oct  7 21:29:55 dmicn20 kernel: [1115306.290745] device-mapper: thin:
> 252:13: reached low water mark for metadata device: sending event.
> ...
>
> How can i find these messages?


Have you enabled  thin threshold in lvm.conf?

     thin_pool_autoextend_threshold = 70
     thin_pool_autoextend_percent = 20

Currently there is not yet better policy support for filled thin pool devices.

And yes - you need to trap syslog messages if you want monitoring for filled 
pool - there is no other support yet (i.e. dbus messaging)

Zdenek