Thanks for that info - the write workload is certainly aggressive during the day for us (100K+ records/sec at times), which would explain why we have 5-6 pre-allocated log files even for an empty db (with 8x2 partitions per leaf, because of redundant mode).
[ec2-user@ip-172-31-16-188 logs]$ du trading_prod_* | cut -f1-3 -d_ | sort | uniq -c
6 262144 trading_prod_0
6 262144 trading_prod_1
6 262144 trading_prod_10
5 262144 trading_prod_11
5 262144 trading_prod_12
6 262144 trading_prod_13
5 262144 trading_prod_14
6 262144 trading_prod_15
6 262144 trading_prod_2
6 262144 trading_prod_3
6 262144 trading_prod_4
5 262144 trading_prod_5
6 262144 trading_prod_6
5 262144 trading_prod_7
5 262144 trading_prod_8
6 262144 trading_prod_9
3 65536 trading_prod_log