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  • Top ASM diskgroup mount issues in RAC Environment (文档 ID 2246762.1)

    APPLIES TO:

    Oracle Database - Enterprise Edition - Version 11.2.0.4 to 12.1.0.2 [Release 11.2 to 12.1]
    Information in this document applies to any platform.

    PURPOSE

    The purpose of this document is to provide a summary of top ASM diskgroup startup issues and the possible solutions in a RAC environment. 

    SCOPE

     DBAs

    DETAILS

    Issue #1: ASM instance could not mount diskgroup hosting OCR/Voting diskgroup

    Symptoms :

    I. crsd log reports error in accessing ocr/vote diskgroup

    2010-04-30 12:58:53.288: [ CRSOCR][2566444800] OCR context init failure. Error: PROC-26: Error while accessing the physical storage ASM error [SLOS: cat=8, opn=kgfoOpenFile01, dep=15056, loc=kgfokge
    ORA-17503: ksfdopn:DGOpenFile05 Failed to open file +OCRVDG.255.4294967295
    ORA-17503: ksfdopn:2 Failed to open file +OCRVDG.255.4294967295
    ORA-15001: diskgroup
    ] [8]

    2010-04-30 12:58:53.288: [ CRSD][2566444800][PANIC] CRSD exiting: Could not init OCR, code: 26


    II. kfed read on the asm disk header reports valid disk header

    # kfed read /asmocrvote1
    kfbh.endian: 1 ; 0x000: 0x01
    kfbh.hard: 130 ; 0x001: 0x82
    kfbh.type: 1 ; 0x002: KFBTYP_DISKHEAD <<<<<<<<<
    kfbh.datfmt: 1 ; 0x003: 0x01
    kfbh.block.blk: 0 ; 0x004: T=0 NUMB=0x0
    kfbh.block.obj: 2147483648 ; 0x008: TYPE=0x8 NUMB=0x0
    .
    kfdhdb.driver.provstr: ORCLDISK ; 0x000: length=8 <<<<<<<
    kfdhdb.driver.reserved[0]: 0 ; 0x008: 0x00000000
    .
    kfdhdb.dsknum: 0 ; 0x024: 0x0000
    kfdhdb.grptyp: 1 ; 0x026: KFDGTP_EXTERNAL <<<<<<<<<
    kfdhdb.hdrsts: 3 ; 0x027: KFDHDR_MEMBER <<<<<<<<<
    kfdhdb.dskname: OCRVDG_0000 ; 0x028: length=11
    .

    Cause :

    ASM spfile was corrupt. Using a transient ASM pfile the OCR/Voting (+OCRVDG) diskgroup was mounted.

    Solutions :

    Startup ASM instance with a temporary pfile and recreate spfile.

    Refer note 1095214.1 for detailed instructions.

    Issue #2: ORA-15063, ORA-15017, ORA-15063 reported in ASM alert log

    Symptoms :

    I. ASM try to mount diskgroup, but it fails with insufficient disks or duplicate disks

    alert__ASM1.log:

    Fri Oct 19 13:09:35 2012
    NOTE: No asm libraries found in the system
    ERROR: -5(Duplicate disk DATA:DATA_0000) <----------- Notice this entry as it tells that ASM discovers duplicate disk (1)

    .

    Fri Oct 19 13:09:44 2012
    SQL> ALTER DISKGROUP ALL MOUNT /* asm agent */

    NOTE: Diskgroup used for Voting files is:
    DATASOA
    Diskgroup used for OCR is:DATA
    Diskgroup used for OCR is:DATASOA.

    WARNING: Disk Group DATA containing configured OCR is not mounted
    ORA-15032: not all alterations performed
    ORA-15017: diskgroup "DATA" cannot be mounted
    ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DATA" <---- ASM discovers not sufficient disks
    ORA-15017: diskgroup "DATASOA" cannot be mounted
    ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DATASOA"

    Cause :

    ASM finding duplicate disks

    Solutions :

    Verify the disks are present in OS with proper ownership and permissions. Also verify the asm_diskstring value and check disks are not getting detected as duplicate.

    Refer note 1501660.1 for additional details

    Issue #3: Not able to Mount Diskgroups in one of the RAC nodes after ASM Abnormally Restart

    Symptoms :

    I. 2 node RAC, Node 1 was evicted then restarted, +ASM1 started, but diskgroups failed to be mounted with error:

    alert_+ASM1.log

    Sun Aug 30 19:06:07 2015
    SQL> ALTER DISKGROUP ALL MOUNT /* asm agent call crs *//* {0:9:62126} */
    NOTE: Diskgroups listed in ASM_DISKGROUPS are
    FLASH
    NOTE: Diskgroup used for Voting files is:
    DATA
    Sun Aug 30 19:06:14 2015
    ERROR: PST found another heartbeat (grp 1)
    ERROR: diskgroup DATA was not mounted
    ERROR: PST found another heartbeat (grp 2)
    ERROR: diskgroup FLASH was not mounted

    ORA-15032: not all alterations performed
    ORA-15017: diskgroup "FLASH" cannot be mounted
    ORA-15003: diskgroup "FLASH" already mounted in another lock name space
    ORA-15017: diskgroup "DATA" cannot be mounted
    ORA-15003: diskgroup "DATA" already mounted in another lock name space
    ERROR: ALTER DISKGROUP ALL MOUNT /* asm agent call crs *//* {0:9:62126} */

    Cause :

    It is due to problem at storage layer. Storage replication happened during that exact time caused two identical disks (voting disk) presented, that led to split brain for clusterware and node eviction 

    Solution :

    Ensure storage layer is not presenting identical disks at same time. Refer note 2053224.1 for more details

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  • 原文地址:https://www.cnblogs.com/Oman/p/9224412.html
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