【Oracle ASM】PST Partnership Status Table介绍

Partner and Status Table 相关：http://www.askmaclean.com/archives/know-oracle-asm-basic-html.html 一般来说aun=1 是保留给Partner and Status Table(PST)的拷贝使用的。 一般5个ASM DISK将包含一份PST拷贝。多数的PST内容必须相同且验证有效。否则无法

Partner and Status Table

相关：http://www.askmaclean.com/archives/know-oracle-asm-basic-html.html

一般来说aun=1 是保留给Partner and Status Table(PST)的拷贝使用的。 一般5个ASM DISK将包含一份PST拷贝。多数的PST内容必须相同且验证有效。否则无法判断哪些ASM DISK实际拥有相关数据。

在 PST中每一条记录对应Diskgroup中的一个ASM DISK。每一条记录会对一个ASM disk枚举其partners的ASM DISK。同时会有一个flag来表示该DISK是否是ONLINE可读写的。这些信息对recovery是否能做很重要。

PST表的Blkn=0是PST的header，存放了如下的信息：

• Timestamp to indicate PST is valid
• Version number to compare with other PST copies
• List of disks containing PST copies
• Bit map for shadow paging updates

PST的最后一个块是heartbeat block，当diskgroup mount时其每3秒心跳更新一次。

以下为PST header

kfed read /oracleasm/asm-disk01 aun=1 blkn=0 aus=4194304 |less
kfbh.endian:                          1 ; 0x000: 0x01
kfbh.hard:                          130 ; 0x001: 0x82
kfbh.type:                           17 ; 0x002: KFBTYP_PST_META
kfbh.datfmt:                          2 ; 0x003: 0x02
kfbh.block.blk:                    1024 ; 0x004: blk=1024
kfbh.block.obj:              2147483648 ; 0x008: disk=0
kfbh.check:                  3813974007 ; 0x00c: 0xe3549ff7
kfbh.fcn.base:                        0 ; 0x010: 0x00000000
kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000
kfbh.spare1:                          0 ; 0x018: 0x00000000
kfbh.spare2:                          0 ; 0x01c: 0x00000000
kfdpHdrPairBv1.first.super.time.hi:32999670 ; 0x000: HOUR=0x16 DAYS=0x7 MNTH=0x2 YEAR=0x7de
kfdpHdrPairBv1.first.super.time.lo:1788841984 ; 0x004: USEC=0x0 MSEC=0x3e4 SECS=0x29 MINS=0x1a
kfdpHdrPairBv1.first.super.last:      2 ; 0x008: 0x00000002
kfdpHdrPairBv1.first.super.next:      2 ; 0x00c: 0x00000002
kfdpHdrPairBv1.first.super.copyCnt:   5 ; 0x010: 0x05
kfdpHdrPairBv1.first.super.version:   1 ; 0x011: 0x01
kfdpHdrPairBv1.first.super.ub2spare:  0 ; 0x012: 0x0000
kfdpHdrPairBv1.first.super.incarn:    1 ; 0x014: 0x00000001
kfdpHdrPairBv1.first.super.copy[0]:   0 ; 0x018: 0x0000
kfdpHdrPairBv1.first.super.copy[1]:   1 ; 0x01a: 0x0001
kfdpHdrPairBv1.first.super.copy[2]:   2 ; 0x01c: 0x0002
kfdpHdrPairBv1.first.super.copy[3]:   3 ; 0x01e: 0x0003
kfdpHdrPairBv1.first.super.copy[4]:   4 ; 0x020: 0x0004
kfdpHdrPairBv1.first.super.dtaSz:    15 ; 0x022: 0x000f
kfdpHdrPairBv1.first.asmCompat:186646528 ; 0x024: 0x0b200000
kfdpHdrPairBv1.first.newCopy[0]:      0 ; 0x028: 0x0000
kfdpHdrPairBv1.first.newCopy[1]:      0 ; 0x02a: 0x0000
kfdpHdrPairBv1.first.newCopy[2]:      0 ; 0x02c: 0x0000
kfdpHdrPairBv1.first.newCopy[3]:      0 ; 0x02e: 0x0000
kfdpHdrPairBv1.first.newCopy[4]:      0 ; 0x030: 0x0000
kfdpHdrPairBv1.first.newCopyCnt:      0 ; 0x032: 0x00
kfdpHdrPairBv1.first.contType:        1 ; 0x033: 0x01
kfdpHdrPairBv1.first.spares[0]:       0 ; 0x034: 0x00000000
kfdpHdrPairBv1.first.spares[1]:       0 ; 0x038: 0x00000000
kfdpHdrPairBv1.first.spares[2]:       0 ; 0x03c: 0x00000000
kfdpHdrPairBv1.first.spares[3]:       0 ; 0x040: 0x00000000
kfdpHdrPairBv1.first.spares[4]:       0 ; 0x044: 0x00000000
kfdpHdrPairBv1.first.spares[5]:       0 ; 0x048: 0x00000000
kfdpHdrPairBv1.first.spares[6]:       0 ; 0x04c: 0x00000000
kfdpHdrPairBv1.first.spares[7]:       0 ; 0x050: 0x00000000
kfdpHdrPairBv1.first.spares[8]:       0 ; 0x054: 0x00000000
kfdpHdrPairBv1.first.spares[9]:       0 ; 0x058: 0x00000000
kfdpHdrPairBv1.first.spares[10]:      0 ; 0x05c: 0x00000000
kfdpHdrPairBv1.first.spares[11]:      0 ; 0x060: 0x00000000
kfdpHdrPairBv1.first.spares[12]:      0 ; 0x064: 0x00000000
kfdpHdrPairBv1.first.spares[13]:      0 ; 0x068: 0x00000000
kfdpHdrPairBv1.first.spares[14]:      0 ; 0x06c: 0x00000000
kfdpHdrPairBv1.first.spares[15]:      0 ; 0x070: 0x00000000
kfdpHdrPairBv1.first.spares[16]:      0 ; 0x074: 0x00000000
kfdpHdrPairBv1.first.spares[17]:      0 ; 0x078: 0x00000000
kfdpHdrPairBv1.first.spares[18]:      0 ; 0x07c: 0x00000000
kfdpHdrPairBv1.first.spares[19]:      0 ; 0x080: 0x00000000

• super.time wall clock time of last PST commit
• super.last? last committed content version number
• super.next next available content version number
• super.copyCnt? # of disks holding PST copies
• super.version?? version of PST header format
• super.ub2spare? pad to ub4 align
• super.incarn incarnation of list
• super.copy[0]? disks holding the PST copies
• super.dtaSz? data entries in PST
• newCopy[0]?? new disks holding PST copies
• newCopyCnt? new # disks holding PST copies

以下为PST table block:

kfed read /oracleasm/asm-disk02 aun=1 blkn=3 aus=4194304 |less
kfbh.endian:                          1 ; 0x000: 0x01
kfbh.hard:                          130 ; 0x001: 0x82
kfbh.type:                           18 ; 0x002: KFBTYP_PST_DTA
kfbh.datfmt:                          2 ; 0x003: 0x02
kfbh.block.blk:                    1027 ; 0x004: blk=1027
kfbh.block.obj:              2147483649 ; 0x008: disk=1
kfbh.check:                  4204644293 ; 0x00c: 0xfa9dc7c5
kfbh.fcn.base:                        0 ; 0x010: 0x00000000
kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000
kfbh.spare1:                          0 ; 0x018: 0x00000000
kfbh.spare2:                          0 ; 0x01c: 0x00000000
kfdpDtaEv1[0].status:               127 ; 0x000: I=1 V=1 V=1 P=1 P=1 A=1 D=1
kfdpDtaEv1[0].fgNum:                  1 ; 0x002: 0x0001
kfdpDtaEv1[0].addTs:         2022663849 ; 0x004: 0x788f66a9
kfdpDtaEv1[0].partner[0]:         49154 ; 0x008: P=1 P=1 PART=0x2
kfdpDtaEv1[0].partner[1]:         49153 ; 0x00a: P=1 P=1 PART=0x1
kfdpDtaEv1[0].partner[2]:         49155 ; 0x00c: P=1 P=1 PART=0x3
kfdpDtaEv1[0].partner[3]:         49166 ; 0x00e: P=1 P=1 PART=0xe
kfdpDtaEv1[0].partner[4]:         49165 ; 0x010: P=1 P=1 PART=0xd
kfdpDtaEv1[0].partner[5]:         49164 ; 0x012: P=1 P=1 PART=0xc
kfdpDtaEv1[0].partner[6]:         49156 ; 0x014: P=1 P=1 PART=0x4
kfdpDtaEv1[0].partner[7]:         49163 ; 0x016: P=1 P=1 PART=0xb
kfdpDtaEv1[0].partner[8]:         10000 ; 0x018: P=0 P=0 PART=0x2710
kfdpDtaEv1[0].partner[9]:             0 ; 0x01a: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[10]:            0 ; 0x01c: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[11]:            0 ; 0x01e: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[12]:            0 ; 0x020: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[13]:            0 ; 0x022: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[14]:            0 ; 0x024: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[15]:            0 ; 0x026: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[16]:            0 ; 0x028: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[17]:            0 ; 0x02a: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[18]:            0 ; 0x02c: P=0 P=0 PART=0x0
kfdpDtaEv1[0].partner[19]:            0 ; 0x02e: P=0 P=0 PART=0x0
kfdpDtaEv1[1].status:               127 ; 0x030: I=1 V=1 V=1 P=1 P=1 A=1 D=1
kfdpDtaEv1[1].fgNum:                  2 ; 0x032: 0x0002
kfdpDtaEv1[1].addTs:         2022663849 ; 0x034: 0x788f66a9
kfdpDtaEv1[1].partner[0]:         49155 ; 0x038: P=1 P=1 PART=0x3
kfdpDtaEv1[1].partner[1]:         49152 ; 0x03a: P=1 P=1 PART=0x0
kfdpDtaEv1[1].partner[2]:         49154 ; 0x03c: P=1 P=1 PART=0x2
kfdpDtaEv1[1].partner[3]:         49166 ; 0x03e: P=1 P=1 PART=0xe
kfdpDtaEv1[1].partner[4]:         49157 ; 0x040: P=1 P=1 PART=0x5
kfdpDtaEv1[1].partner[5]:         49156 ; 0x042: P=1 P=1 PART=0x4
kfdpDtaEv1[1].partner[6]:         49165 ; 0x044: P=1 P=1 PART=0xd
kfdpDtaEv1[1].partner[7]:         49164 ; 0x046: P=1 P=1 PART=0xc
kfdpDtaEv1[1].partner[8]:         10000 ; 0x048: P=0 P=0 PART=0x2710
kfdpDtaEv1[1].partner[9]:             0 ; 0x04a: P=0 P=0 PART=0x0
kfdpDtaEv1[1].partner[10]:            0 ; 0x04c: P=0 P=0 PART=0x0
kfdpDtaEv1[1].partner[11]:            0 ; 0x04e: P=0 P=0 PART=0x0
kfdpDtaEv1[1].partner[12]:            0 ; 0x050: P=0 P=0 PART=0x0
kfdpDtaEv1[1].partner[13]:            0 ; 0x052: P=0 P=0 PART=0x0
kfdpDtaEv1[1].partner[14]:            0 ; 0x054: P=0 P=0 PART=0x0
kfdpDtaEv1[1].partner[15]:            0 ; 0x056: P=0 P=0 PART=0x0
kfdpDtaEv1[1].partner[16]:            0 ; 0x058: P=0 P=0 PART=0x0

• kfdpDtaEv1[0].status: 127 ; 0×000: I=1 V=1 V=1 P=1 P=1 A=1 D=1 disk status
• fgNum?? fail group number
• addTs?? timestamp of the addition to the diskgroup
• kfdpDtaEv1[0].partner[0]:???????? 49154 ; 0×008: P=1 P=1 PART=0×2? partner list

aun=1 的最后第二个block中备份了一份KFBTYP_DISKHEAD

[oracle@mlab2 hzy]$ kfed read /oracleasm/asm-disk02 aun=1 blkn=1022 aus=4194304 |less
kfbh.endian:                          1 ; 0x000: 0x01
kfbh.hard:                          130 ; 0x001: 0x82
kfbh.type:                            1 ; 0x002: KFBTYP_DISKHEAD
kfbh.datfmt:                          1 ; 0x003: 0x01
kfbh.block.blk:                    1022 ; 0x004: blk=1022
kfbh.block.obj:              2147483649 ; 0x008: disk=1
kfbh.check:                  3107059260 ; 0x00c: 0xb931f63c
kfbh.fcn.base:                        0 ; 0x010: 0x00000000
kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000
kfbh.spare1:                          0 ; 0x018: 0x00000000
kfbh.spare2:                          0 ; 0x01c: 0x00000000
kfdhdb.driver.provstr:         ORCLDISK ; 0x000: length=8
kfdhdb.driver.reserved[0]:            0 ; 0x008: 0x00000000
kfdhdb.driver.reserved[1]:            0 ; 0x00c: 0x00000000
kfdhdb.driver.reserved[2]:            0 ; 0x010: 0x00000000
kfdhdb.driver.reserved[3]:            0 ; 0x014: 0x00000000
kfdhdb.driver.reserved[4]:            0 ; 0x018: 0x00000000
kfdhdb.driver.reserved[5]:            0 ; 0x01c: 0x00000000
kfdhdb.compat:                186646528 ; 0x020: 0x0b200000
kfdhdb.dsknum:                        1 ; 0x024: 0x0001
kfdhdb.grptyp:                        3 ; 0x026: KFDGTP_HIGH
kfdhdb.hdrsts:                        3 ; 0x027: KFDHDR_MEMBER
kfdhdb.dskname:              DATA1_0001 ; 0x028: length=10
kfdhdb.grpname:                   DATA1 ; 0x048: length=5
kfdhdb.fgname:               DATA1_0001 ; 0x068: length=10
kfdhdb.capname:                         ; 0x088: length=0
kfdhdb.crestmp.hi:             32999670 ; 0x0a8: HOUR=0x16 DAYS=0x7 MNTH=0x2 YEAR=0x7de
kfdhdb.crestmp.lo:           1788720128 ; 0x0ac: USEC=0x0 MSEC=0x36d SECS=0x29 MINS=0x1a
kfdhdb.mntstmp.hi:             32999670 ; 0x0b0: HOUR=0x16 DAYS=0x7 MNTH=0x2 YEAR=0x7de
kfdhdb.mntstmp.lo:           1812990976 ; 0x0b4: USEC=0x0 MSEC=0x3 SECS=0x1 MINS=0x1b
kfdhdb.secsize:                     512 ; 0x0b8: 0x0200
kfdhdb.blksize:                    4096 ; 0x0ba: 0x1000
kfdhdb.ausize:                  4194304 ; 0x0bc: 0x00400000

AUN=1 的最后一个block为KFBTYP_HBEAT 心跳表：

[oracle@mlab2 hzy]$ kfed read /oracleasm/asm-disk02 aun=1 blkn=1023 aus=4194304 |less
kfbh.endian:                          1 ; 0x000: 0x01
kfbh.hard:                          130 ; 0x001: 0x82
kfbh.type:                           19 ; 0x002: KFBTYP_HBEAT
kfbh.datfmt:                          2 ; 0x003: 0x02
kfbh.block.blk:                    2047 ; 0x004: blk=2047
kfbh.block.obj:              2147483649 ; 0x008: disk=1
kfbh.check:                  1479766671 ; 0x00c: 0x5833728f
kfbh.fcn.base:                        0 ; 0x010: 0x00000000
kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000
kfbh.spare1:                          0 ; 0x018: 0x00000000
kfbh.spare2:                          0 ; 0x01c: 0x00000000
kfdpHbeatB.instance:                  1 ; 0x000: 0x00000001
kfdpHbeatB.ts.hi:              32999734 ; 0x004: HOUR=0x16 DAYS=0x9 MNTH=0x2 YEAR=0x7de
kfdpHbeatB.ts.lo:            3968041984 ; 0x008: USEC=0x0 MSEC=0xe1 SECS=0x8 MINS=0x3b
kfdpHbeatB.rnd[0]:           1065296177 ; 0x00c: 0x3f7f2131
kfdpHbeatB.rnd[1]:            857037208 ; 0x010: 0x33155998
kfdpHbeatB.rnd[2]:           2779184235 ; 0x014: 0xa5a6fc6b
kfdpHbeatB.rnd[3]:           2660793989 ; 0x018: 0x9e987e85

• kfdpHbeatB.instance?? instance id
• kfdpHbeatB.ts.hi timestamp
• kfdpHbeatB.rnd[0]? 随机加盐

• ?External Redundancy一般有一个PST
• Normal Redundancy至多有个3个PST
• High Redundancy 至多有5个PST

如下场景中PST 可能被重定位：

• 存有PST的ASM DISK不可用了(当ASM启东时)
• ASM DISK OFFLINE了
• 当对PST的读写发生了I/O错误
• disk被正常DROP了

• ?在读取其他ASM metadata之前会先检查PST
• 当ASM实例被要求mount diskgroup时，GMON进程会读取diskgroup中所有磁盘去找到和确认PST拷贝
• 如果他发现有足够的PST，那么会mount diskgroup
• 之后，PST会被缓存在ASM缓存中，以及GMON的PGA中并使用排他的PT.n.0锁保护
• 同集群中的其他ASM实例也将缓存PST到GMON的PGA，并使用共享PT.n.o锁保护
• 仅仅那个持有排他锁的GMON能更新磁盘上的PST信息
• 每一个ASM DISK上的AUN=1均为PST保留，但只有几个磁盘上真的有PST数据

kfbh.endian
kf3.h /*endiannessofwriter*/

Little endian = 1 Big endian = 0

kfbh.hard
kf3.h /*H.A.R.D.magic#andblocksize*/

kfbh.type
kf3.h /* metadata block type */

kfbh.datfmt
kf3.h /*metadatablockdataformat */

kfbh.block
kf3.h /*blocklocationofthisblock */

blk — Disk header should have T=0 and NUMB=0×0

obj — Disk header should have TYPE=0×8 NUMB= blkandobjvaluesarederivedfromaseriesofmacrosinkf3.h. See “KFBL Macros” in kf3.h for more information.

kfbh.check
kf3.h /*checkvaluetoverifyconsistency*/

kfbh.fcn
kf3.h /*changenumberoflastchange */

kfdpHdrB.time.hi
kf3.h HiorderedbitsfromthelastcommittedPSTupdate

kfdpHdrB.time.lo
kf3.h LoworderedbitsfromthelastcommittedPSTupdate

kfdpHdrB.last
kf3.h /* last version number */

kfdpHdrB.next
kf3.h /* next version number */

kfdpHdrB.copyCnt
kf3.h /* # of PST copies */

This defaults to “1″ for external redundancy, “3″ for normal redundancy and”5″forhighredundancy. Ifthenumberoffailuregroupsisless than the default value, the number failure groups is the value used.

kfdpHdrB.incarn
kf3.h /* incarnation of */

This is set to kfdpHdrB.last when the PST is moved to another disk.

kfdpHdrB.copy[0-4]
kf3.h /* disks holding the PST copies */

[0] — external redundancy [0-2] –normalredundancy [0-4] –highredundancy

kfdpHdrB.dtaSz
kf3.h /*#dtaentriesinPST */

This is the number of disks that it needs to keep track of. ub1[0-4027]

Related posts:

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3. 【Oracle ASM数据恢复】ORA-15032、ORA-15075 ASM DISK PATH Problem
4. 【Oracle ASM】ASM FILE NUMBER #2 DISK Directory
5. 【ASM数据恢复】如何修复ASM Disk header_status=FORMER的磁盘重新加入Diskgroup ORA-15017 ORA-15063 ORA-15032
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7. 【Oracle ASM】ASM FILE NUMBER 3 Active Change Directory
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10. 【Oracle ASM数据恢复】ORA-15042: ASM disk is missing after add disk took place错误解析

原文地址：【Oracle ASM】PST Partnership Status Table介绍, 感谢原作者分享。