FS_CACHING will be 0 if filesystem caching is enabled. You can also get this info from db2pd -tablespaces. Example:
db2pd -d sample -tablespaces
Database Partition 0 -- Database SAMPLE -- Active -- Up 0 days 00:00:11
Tablespace Configuration:
Address Id Type Content PageSz ExtentSz Auto Prefetch BufID BufIDDisk FSC NumCntrs MaxStripe LastConsecPg Name
0x078000002041F640 0 DMS Regular 4096 4 Yes 4 1 1 On 1 0 3 SYSCATSPACE
0x078000002040ABA0 1 SMS SysTmp 4096 32 Yes 32 1 1 On 1 0 31 TEMPSPACE1
0x078000002040F400 2 DMS Large 4096 32 Yes 32 1 1 On 1 0 31 USERSPACE1
FSC column