SQLUV_IO_ERROR 25 IO error encountered

Question :

In the db2diag.log file – I’m getting the the error message

Vendor RC=0x00000019=25 -- see DB2 API Guide for meaning.

2012-04-25-06.30.42.834149+060 I1209204241E814     LEVEL: Error
PID     : 13535                TID  : 47410969569600PROC : db2sysc 0
INSTANCE: myInst              NODE : 000
EDUID   : 17727                EDUNAME: db2logmgr (myDB) 0
FUNCTION: DB2 UDB, data protection services, sqlpWriteToVendorDevice, probe:2700
MESSAGE : ZRC=0x86100025=-2045771739=SQLP_MEDIA_VENDOR_DEV_ERR
          "A vendor device reported a media error."
DATA #1 : Vendor RC, PD_DB2_TYPE_VENDOR_RC, 4 bytes
Vendor RC=0x00000019=25 -- see DB2 API Guide for meaning.
DATA #2 : Hexdump, 48 bytes
0x00002B1ED2603150 : 9B00 0000 3133 3338 2031 3535 0000 0000    ....1338 155....
0x00002B1ED2603160 : 0000 0000 0000 0000 0000 0000 0000 0000    ................

How can I troubleshoot the  SQLUV_IO_ERROR  25   IO error encountered  error message?

Answer:

Read the post Troubleshooting DB2 Return Codes, failed to archive log and SQLUV_INIT_FAILED   for DB2 return code interpretation

The definitions for all DB2 to Vendor API return codes are found under the instance home directory <sqllib>/include/ in the sqluvend.h header file.
The DB2 error code returns :
#define SQLUV_IO_ERROR         25  /* I/O error encountered */
The Vendor Code is returned using the return code 155
0155 T: DSM_RC_COMPRESS_GREW Compressed Data Grew
Explanation

The size of the file after compression is greater than the size of the file before compressed.

System action

Even though the size of the file increased, the file is compressed.

The error message  related to  TSM  trying to compress an object that has already been compressed.  Setting the local option file to  COMPRESSALWAYS  is YES overrides this error.