If hana log file system is full, then your DB will not be response.In this case you need to check below steps and you should not delete any log files on disk manually.

You can check the status of your LOG size and disk usage any time from HANA Studio like below ;

The log segment are stored in the location /hana/log/<SID>/mnt00001/hdb00002/logsegment_*.  you should not delete these files otherwise you can not open your database.

Table SYS.M_LOG_SEGMENTS will give you the detail ;

select top 1000 * from “SYS”.”M_LOG_SEGMENTS”

Also we can check the status of log files via below sql command ;

select b.host, b.service_name, a.state, count(*) 
from "PUBLIC"."M_LOG_SEGMENTS" a 
join "PUBLIC"."M_SERVICES" b on (a.host = b.host AND a.port = b.port) 
group by b.host, b.service_name, a.state;

According to this result, if some log files are in free state then we can use the below command to release some space ;

ALTER SYSTEM RECLAIM LOG;

Don’t forget that ;

* If most log segments are in state TRUNCATED, you might have a problem or in state BACKEDUP you might have a problem with hanging savepoint.

Status informations of Log states are shown in this picture ;

Details informations are can be found in this SNOTE ;

1679938 – DiskFullEvent on Log Volume 

If you have secondary side with system replication then you need to use log release command ;

hdbcons ‘log release’

Details informations are can be found in this SNOTE ;

2409471 – SAP HANA Log Volume Full on Secondary or Tertiary Site with System Replication