How big is database?
Please show result of this query: select * from pg_stat_activity where query 
like 'autovacuum%';
I think here is running antiwraparound autovacuum. In this case all is normal, 
antiwraparound will produce a lot of WAL and this is necessary to continue 
database working.

PS: please note postgresql 9.1 is EOL.

regards, Sergei

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