Re: [MooseFS-Users] CHUNKS_SOFT_DEL_LIMIT and CHUNKS_HARD_DEL_LIMIT on moosefs ce

[Aleksander W. <ale...@mo...>]

Hello
First of all I would like to explain what these parameters mean and how
does it work:

CHUNKS_SOFT_DEL_LIMIT - Soft maximum number of chunks being
simultaneously deleted on one chunkserver (default is 10)
CHUNKS_HARD_DEL_LIMIT - Hard maximum number of chunks being
simultaneously deleted on one chunkserver (default is 25)

MooseFS mainly uses the soft delete limit. If the system is able to
remove all "to delete" chunks in one loop run, deletion limit will not
be changed.
But if the number of chunks to delete increase after a loop run,
deletion limit will be increased by factor of 1.5 but never to a value
higher than CHUNKS_HARD_DEL_LIMIT.

This mechanism was implemented to prevent MooseFS cluster from freezing
because of too many delete operations.
So if you have small number of delete operations in your system hard
limit will never be reached.

How many files are you deleting in your system?

Best regards
Aleksander Wieliczko
Technical Support Engineer
MooseFS.com <moosefs.com>

On 04/01/2015 09:48 PM, Eduardo Kellenberger wrote:
>
> To make changes to the configuration file on the parameters mfsmaster.conf
>
>  CHUNKS_SOFT_DEL_LIMIT
>  CHUNKS_HARD_DEL_LIMIT
>
>  these are not reflected in the graphs.
>
>  Anyone have idea about it.
>
>
>
>