Take note, I am a newbie . I am encountering a low disk space alert.
I have one instance and my DB2 UDB version is 9.1.
Path to Log Files of the database in question shows a path which have enough disk space i.e. Path to Log Files = /db2kb7777/partX/logs/REX_db/NODE0000/, base on the Log file size (4KB) (LOGFILSIZ) = 5000, size of the log files in this directory is 20488192, and files are from
-rw------- 1 db2kb7777 db2 20488192 Apr 29 12:59 S0000000.LOG
to
-rw------- 1 db2kb7777 db2 20488192 Jan 14 15:19 S0000009.LOG

***
Number of primary log files (LOGPRIMARY) = 10
Number of secondary log files (LOGSECOND) = 4
***

BUT I am getting a low disk space alert on these directories (99% Used)
/db2kb7777/partB/logs/REX_db/NODE0002
and this directory
/db2kb7777/partC/logs/REX_db/NODE0001

Log files here: /db2kb7777/partB/logs/REX_db/NODE0002 are from
-rw------- 1 db2kb7777 db2 40968192 Apr 16 22:39 S0000000.LOG
to
-rw------- 1 db2kb7777 db2 40968192 Apr 16 22:38 S0000024.LOG
with
-rw------- 1 db2kb7777 db2 40968192 Apr 29 12:59 S0000003.LOG

Log files here: /db2kb7777/partC/logs/REX_db/NODE0001 are from
-rw------- 1 db2kb7777 db2 40968192 Apr 29 12:59 S0000000.LOG
to
-rw------- 1 db2kb7777 db2 40968192 Apr 16 22:40 S0000024.LOG

It appears that database REX_db uses these logs files but I don't see how these directories are related to the database REX_db base on the database configurations. I am wondering how come their modification date is more updated than the one listed in "Path to Log Files" of REX_db. There is no other instance here except db2kb7777 (as per db2ilist), I made sure no other databases inadvertently used these directories for their log files.

My questions:
How can I know for sure who owns these log files?
Could there be some sort of replication or log shipping at work here and is utilizing these directories? and how can I find out if there are?
Any other ideas and/or insight that can shed light on what I am missing here?

Thanks in advance!

have a look at db cfg for database- this indicates the logparh - if mirrored
or achived and where to

Judging by NODE0001 and NODE0002 in your log path strings, you probably have a partitioned database. Please keep in mind that the database configuration, including the log paths, may differ between partitions.

Thanks for your response!

Here are related db cfg for REX_db, logs are not mirrored.

Path to log files = /db2kb7777/partX/logs/REX_db/NODE0000/
Overflow log path (OVERFLOWLOGPATH) =
Mirror log path (MIRRORLOGPATH) =
First active log file =
Log retain for recovery enabled (LOGRETAIN) = OFF

How can I verify if a database is partitioned?

Thanks in advance!

Please take a look at this article:
A colorful introduction to DB2 UDB, Version 8 for UNIX, Linux, and Windows: Overview of the Database Partitioning Feature