[求助]SLES10.2 每天到18：00准时出现无法提供任何服务，只能ping通故障

darwinux

大概就在8号还是好好的（看/var/log/messages日志）结果从9号开始，每天的18：00就出现故障，什么服务都无法使用，什么FTP，sybase ase,SSH，全部无法连接，但能Ping通服务器，只能重启服务器才可以使用。我贴出故障的/var/log/messages在18：00的日志。

这是14号：
Aug 14 18:00:01 linux-rlir /usr/sbin/cron[9589]: (root) CMD (hwclock -s)
Aug 14 18:01:34 linux-rlir kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Aug 14 18:01:34 linux-rlir kernel: ata1.00: cmd 25/00:00:86:01:46/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
Aug 14 18:01:34 linux-rlir kernel:          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Aug 14 18:01:34 linux-rlir kernel: ata1: soft resetting port
Aug 14 18:01:34 linux-rlir kernel: ata1.00: configured for UDMA/133
Aug 14 18:01:34 linux-rlir kernel: ata1: EH complete
Aug 14 18:02:34 linux-rlir kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Aug 14 18:02:34 linux-rlir kernel: ata1.00: cmd 25/00:00:86:01:46/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
Aug 14 18:02:34 linux-rlir kernel:          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Aug 14 18:02:35 linux-rlir kernel: ata1: soft resetting port
Aug 14 18:02:35 linux-rlir kernel: ata1.00: configured for UDMA/133
Aug 14 18:02:35 linux-rlir kernel: ata1: EH complete
Aug 14 18:02:35 linux-rlir kernel: SCSI device sda: 488397168 512-byte hdwr sectors (250059 MB)
Aug 14 18:02:35 linux-rlir kernel: sda: Write Protect is off
Aug 14 18:08:37 linux-rlir kernel: sda: Mode Sense: 00 3a 00 00
Aug 14 18:08:37 linux-rlir /usr/sbin/cron[9668]: (root) CMD (hwclock -s)
Aug 14 18:08:40 linux-rlir kernel: SCSI device sda: drive cache: write back
Aug 14 18:08:40 linux-rlir kernel: SCSI device sda: 488397168 512-byte hdwr sectors (250059 MB)
Aug 14 18:08:40 linux-rlir kernel: sda: Write Protect is off
Aug 14 18:08:40 linux-rlir kernel: sda: Mode Sense: 00 3a 00 00
Aug 14 18:08:40 linux-rlir kernel: SCSI device sda: drive cache: write back
Aug 14 18:08:40 linux-rlir kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Aug 14 18:08:40 linux-rlir kernel: ata1.00: cmd 25/00:00:86:09:46/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
Aug 14 18:08:40 linux-rlir kernel:          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Aug 14 18:08:40 linux-rlir kernel: ata1: soft resetting port
Aug 14 18:08:40 linux-rlir kernel: ata1.00: configured for UDMA/133
Aug 14 18:08:40 linux-rlir kernel: ata1: EH complete
Aug 14 18:08:40 linux-rlir kernel: ata1.00: limiting speed to UDMA/100
Aug 14 18:08:40 linux-rlir kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Aug 14 18:08:40 linux-rlir kernel: ata1.00: cmd 25/00:00:86:09:46/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
Aug 14 18:08:40 linux-rlir kernel:          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Aug 14 18:08:40 linux-rlir kernel: ata1: soft resetting port
Aug 14 18:08:40 linux-rlir kernel: ata1.00: configured for UDMA/100
Aug 14 18:08:40 linux-rlir kernel: ata1: EH complete
Aug 14 18:08:40 linux-rlir kernel: ata1.00: limiting speed to UDMA/66
Aug 14 18:08:40 linux-rlir kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Aug 14 18:08:40 linux-rlir kernel: ata1.00: cmd 25/00:00:86:09:46/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
Aug 14 18:08:40 linux-rlir kernel:          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Aug 14 18:08:40 linux-rlir kernel: ata1: soft resetting port
Aug 14 18:08:40 linux-rlir kernel: ata1.00: configured for UDMA/66
Aug 14 18:08:40 linux-rlir kernel: ata1: EH complete
Aug 14 18:08:40 linux-rlir kernel: ata1.00: limiting speed to UDMA/44
Aug 14 18:08:40 linux-rlir kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Aug 14 18:08:40 linux-rlir kernel: ata1.00: cmd 25/00:00:86:09:46/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
Aug 14 18:08:40 linux-rlir kernel:          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Aug 14 18:08:40 linux-rlir kernel: ata1: soft resetting port
Aug 14 18:08:40 linux-rlir kernel: ata1.00: configured for UDMA/44
Aug 14 18:08:40 linux-rlir kernel: ata1: EH complete
Aug 14 18:08:40 linux-rlir kernel: ata1.00: limiting speed to UDMA/33
Aug 14 18:08:40 linux-rlir kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Aug 14 18:08:40 linux-rlir kernel: ata1.00: cmd 25/00:00:86:09:46/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
Aug 14 18:08:40 linux-rlir kernel:          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Aug 14 18:08:40 linux-rlir kernel: ata1: soft resetting port
Aug 14 18:08:40 linux-rlir kernel: ata1.00: configured for UDMA/33
Aug 14 18:08:40 linux-rlir kernel: ata1: EH complete
Aug 14 18:08:40 linux-rlir kernel: ata1.00: limiting speed to UDMA/25
Aug 14 18:08:40 linux-rlir kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
Aug 14 18:08:40 linux-rlir kernel: ata1.00: cmd 25/00:00:86:09:46/00:04:00:00:00/e0 tag 0 cdb 0x0 data 524288 in
Aug 14 18:08:40 linux-rlir kernel:          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Aug 14 18:08:40 linux-rlir kernel: ata1: soft resetting port
Aug 14 18:08:40 linux-rlir kernel: ata1.00: configured for UDMA/25
Aug 14 18:08:40 linux-rlir kernel: sd 0:0:0:0: SCSI error: return code = 0x08000002
Aug 14 18:08:40 linux-rlir kernel: sda: Current [descriptor]: sense key: Aborted Command
Aug 14 18:08:40 linux-rlir kernel:     Additional sense: No additional sense information
Aug 14 18:08:40 linux-rlir kernel: Descriptor sense data with sense descriptors (in hex):
Aug 14 18:08:40 linux-rlir kernel:         72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00
Aug 14 18:08:40 linux-rlir kernel:         00 00 00 00
Aug 14 18:08:40 linux-rlir kernel: end_request: I/O error, dev sda, sector 4589958
Aug 14 18:08:40 linux-rlir kernel: ata1: EH complete
Aug 14 18:08:40 linux-rlir kernel: SCSI device sda: 488397168 512-byte hdwr sectors (250059 MB)
Aug 14 18:08:40 linux-rlir kernel: sda: Write Protect is off
Aug 14 18:08:40 linux-rlir kernel: sda: Mode Sense: 00 3a 00 00
Aug 14 18:08:40 linux-rlir kernel: SCSI device sda: drive cache: write back
Aug 14 18:08:40 linux-rlir kernel: SCSI device sda: 488397168 512-byte hdwr sectors (250059 MB)
Aug 14 18:08:40 linux-rlir kernel: sda: Write Protect is off
Aug 14 18:08:40 linux-rlir kernel: sda: Mode Sense: 00 3a 00 00
Aug 14 18:08:40 linux-rlir kernel: SCSI device sda: drive cache: write back