Fail consistency check

Using Online 5.03.UC2P1 on SCO OSR5, running on a Compaq Proliant 4500. There is also a backup machine, where everyday we replay a level 0 archive and logs. On this backup machine, we get the following errors every day : 08:08:36 -- WARNING: Fail Consistency Check -- pthdrpage:ptalloc:bad partnpag e -- pid=1227 user=200 us=800019f4 08:08:36 cannot recreate index 'ispnopen' -- partnum = 1000d6c, keynum =185272 7651 08:08:36 iserrno = 135, errno = 4 08:08:36 -- WARNING: Fail Consistency Check -- Create the index manuallyafter system is On-Line -- pid=1227 user=200 us=800019f4 08:08:36 bfcheck: bad page: pg_addr 111a98 != bp->bf_pagenum 222f20, userp =80 0019f4, pid = 1227, uid = 200 08:08:36 buffer header: 08:08:36 801663a8: 00000000 00000000 5ce01280 84f61080 ........ \\....... 08:08:36 801663b8: a8020080 a8751380 02000000 01060000 .....u.. ........ 08:08:36 ....... and further on : 08:08:36 80ad17fc: 04c7d90d .... 08:08:36 -- Fail Consistency Check -- btaddkeys:bad data page -- pid=1227 user=200 us=800019f4 08:08:36 cannot recreate index 'isaddindex' -- partnum = 1000cff, keynum =1852 727651 08:08:36 iserrno = 105, errno = 4 08:08:36 -- WARNING: Fail Consistency Check -- Create the index manuallyafter system is On-Line -- pid=1227 user=200 us=800019f4 08:08:36 bfcheck: bad page: pg_addr 111a98 != bp->bf_pagenum 222f20, userp =80 0019f4, pid = 1227, uid = 200 08:08:36 buffer header: 08:08:36 801663a8: 00000000 00000000 5ce01280 84f61080 ........ \\....... when we bring the machine to online, we get 12:28:11 allocpage:warning pagenum (298) > npused (2) 12:28:11 allocpage: partp (80074904), partnum (1000da9) 12:28:11 allocpage:warning pagenum (310) > npused (299) What is going on, and how can it be fixed ? TIA. Guy