for both problems could have good understanding of transaction logging in DB2.
Okram: LOGFILSIZ, LOGPRIMARY, LOGSECOND, LOGRETAIN, USEREXIT, probably, the values you have to check/change and read about.
In glance, add LOGSECOND (the sum of LOGPRIMARY and LOGSECOND must be <= 256),
and/or change LOGFILSIZ.
but it's not always good to have huge these values .
Better read the doc to find the proper solution.

Okram:
are you sure the dir looking like NODE????/SQL0000?
contains "лишнюю информацию" ??
Because this looks like your tablespace.
if you are about "Path to log files", which has something like SQLOGDIR at the end, so it is a dir where to transaction logs are being written.
Probably you have a lot of logs files there, looking like S0000000.LOG, and so on, with sequential numbers.
Use USEREXIT to put your archive logs somewhere in a safe place, like on a tape, network storage, whatever you have reliable.
Send then by email :)

send _them_ by email :)