请帮忙看下ASM磁盘组，offline了一个磁盘
ASMCMD> lsdsk
Path
/dev/mapper/DATA1
/dev/mapper/DATA2
/dev/mapper/OCR1
/dev/mapper/OCR2
/dev/mapper/OCR3
/dev/mapper/REDO1
ASMCMD> lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED EXTERN N 512 4096 2097152 1024000 921912 0 921912 0 N DATA/
MOUNTED EXTERN N 512 4096 4194304 6144 5696 0 5696 0 Y OCR/
MOUNTED NORMAL N 512 4096 1048576 5120 3402 0 1701 1 N REDO/
ASMCMD> exit
$ ll /dev/mapper/
total 0
crw-rw----. 1 root root 10, 58 Aug 18 21:30 control
lrwxrwxrwx. 1 root root 7 Dec 15 15:04 DATA1 -> ../dm-4
lrwxrwxrwx. 1 root root 7 Dec 15 15:04 DATA2 -> ../dm-6
lrwxrwxrwx. 1 root root 7 Dec 10 08:24 OCR1 -> ../dm-2
lrwxrwxrwx. 1 root root 7 Dec 10 08:24 OCR2 -> ../dm-0
lrwxrwxrwx. 1 root root 7 Dec 10 08:24 OCR3 -> ../dm-1
lrwxrwxrwx. 1 root root 7 Dec 10 08:24 REDO1 -> ../dm-5
lrwxrwxrwx. 1 root root 7 Dec 10 08:24 REDO2 -> ../dm-3
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为什么会有1个磁盘offline了呢， 这个要怎么解决？
# multipath -ll
REDO2 (360002ac000000000000000110001b14a) dm-3 3PARdata,VV
size=5.0G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 1:0:0:3 sdr 65:16 active ready running
|- 1:0:1:3 sdy 65:128 active ready running
|- 0:0:2:3 sdd 8:48 active ready running
`- 0:0:3:3 sdk 8:160 active ready running
REDO1 (360002ac000000000000000100001b14a) dm-5 3PARdata,VV
size=5.0G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
|- 1:0:0:4 sds 65:32 active ready running
|- 1:0:1:4 sdz 65:144 active ready running
|- 0:0:2:4 sde 8:64 active ready running
`- 0:0:3:4 sdl 8:176 active ready running
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链路没问题，采用的多路径的方式挂载的
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