【Oracle ASM】PST Partnership Status Table介绍-tutorial mysql-php.cn

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

Salin selepas log masuk

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

Salin selepas log masuk

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

Salin selepas log masuk

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

Salin selepas log masuk

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]

【Oracle ASM数据恢复】ERROR: no PST quorum in group 1: required 2, found 0问题解析
【Oracle ASM数据恢复】如何恢复oracleasm deletedisk删除的ASM Disk
【Oracle ASM数据恢复】ORA-15032、ORA-15075 ASM DISK PATH Problem
【Oracle ASM】ASM FILE NUMBER #2 DISK Directory
【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
【Oracle ASM Metadata】Template Directory (file #5)
【Oracle ASM】ASM FILE NUMBER 3 Active Change Directory
【Oracle ASM Metadata】Alias Directory (file #6)
【Oracle ASM】Continuing Operations Directory (file #4)
【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。