在 ASM ALERT LOG中发现了奇怪的问题

ALLSTARS_ORACLE

以下是从ASM 实例的 alert_+ASM2.log 文件中剪取的出错片断, 我感到很困惑的是 竟然提示读取 /dev/random 出错.
主机是Red Hat Enterprise Linux Server release 5.5 (Tikanga) Linux version 2.6.18-194.el5 (mockbuild@x86-005.build.bos.redhat.com)
双节点RAC , ORACLE 版本是 11.2.0.1.0 64bit.
ASM PARAMETER:
asm_diskstring                       string                 /dev/

# ls -l /dev/random crw-rw-rw- 1 root root 1, 8 Oct 18 11:23 /dev/random---------------------报错信息-------------------
Sat Feb 02 09:02:23 2013
Errors in file /u01/app/grid/diag/asm/+asm/+ASM2/trace/+ASM2_ora_10151.trc:
ORA-27070: async read/write failed
WARNING: IO Failed. group:0 disk(number.incarnation):0.0xe9685572 disk_path:/dev/random
         AU:0 disk_offset(bytes):0 io_size:4096 operation:Read type:asynchronous
         result:I/O error process_id:10151
Sat Feb 02 09:02:23 2013
Errors in file /u01/app/grid/diag/asm/+asm/+ASM2/trace/+ASM2_ora_10155.trc:
ORA-27070: async read/write failed
WARNING: IO Failed. group:0 disk(number.incarnation):0.0xe9685572 disk_path:/dev/random
         AU:0 disk_offset(bytes):0 io_size:4096 operation:Read type:asynchronous
         result:I/O error process_id:10155
Sat Feb 02 09:02:24 2013
Errors in file /u01/app/grid/diag/asm/+asm/+ASM2/trace/+ASM2_ora_10160.trc:
ORA-27070: async read/write failed
WARNING: IO Failed. group:0 disk(number.incarnation):0.0xe9685572 disk_path:/dev/random
         AU:0 disk_offset(bytes):0 io_size:4096 operation:Read type:asynchronous
         result:I/O error process_id:10160
Sat Feb 02 09:02:24 2013
Errors in file /u01/app/grid/diag/asm/+asm/+ASM2/trace/+ASM2_ora_10164.trc:
ORA-27070: async read/write failed
WARNING: IO Failed. group:0 disk(number.incarnation):0.0xe9685572 disk_path:/dev/random
         AU:0 disk_offset(bytes):0 io_size:4096 operation:Read type:asynchronous
         result:I/O error process_id:10164