急急急,求助啊

ALLSTARS_ORACLE

SQL> alter diskgroup FDG mount;
alter diskgroup FDG mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15017: diskgroup "FDG" cannot be mounted
ORA-15063: ASM discovered an insufficient number of disks for diskgroup "FDG"
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed



rac一个节点看不到一个磁盘组,mount报错



哪位大神知道怎么回事

ORA-15063: ASM discovered an insufficient number of disks for diskgroup "FDG" 这个意思表示ASM dg的磁盘没有完全识别出来，可以先看历史alert日志，看看是哪个磁盘丢了 可能原因 1. 有部分磁盘不可读取，权限、没激活等 2. 如果可以读取，可能是磁盘头损坏，需要使用kfed read先尝试读取一下磁盘头，看看能否读取 如果坏了，先尝试kfed repair，如果修复不了，需要尝试kfed merge 可以百度一下，有很详细的说明 ...