之前介绍了《深入了解Oracle ASM(二):ASM File number 1 文件目录》 ， 接着我们介绍ASM file number 2 DISK directory。
file number 2 DISK directory存放了已经加入到diskgroup中的DISK信息。虽然很多信息是对AUN=0 blkn=0的重复，但是此处还存放了一些状态信息。如果某个磁盘失败了，则该信息会存放在DISK directory和PST中，但并不直接记录在DISK HEADER。
可以通过SQL来获得FILE NUMBER 2的位置信息，当然也可以通过KFED 读FILE NUMBER 1来获得：
SQL> SELECT xnum_kffxp "Extent", au_kffxp "AU", disk_kffxp "Disk" from x$kffxp
2 WHERE group_kffxp=1 and number_kffxp=2
3 and xnum_kffxp <> 2147483648;
Extent AU Disk
---------- ---------- ----------
0 2 4
0 3 2
0 2 8
使用KFED的话 首先确认f1b1
[oracle@mlab2 ~]$ kfed read /oracleasm/asm-disk01 aus=4194304 aun=0 blkn=0|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: 0 ; 0x004: blk=0
kfbh.block.obj: 2147483648 ; 0x008: disk=0
kfbh.check: 3107059325 ; 0x00c: 0xb931f67d
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: 0 ; 0x024: 0x0000
kfdhdb.grptyp: 3 ; 0x026: KFDGTP_HIGH
kfdhdb.hdrsts: 3 ; 0x027: KFDHDR_MEMBER
kfdhdb.dskname: DATA1_0000 ; 0x028: length=10
kfdhdb.grpname: DATA1 ; 0x048: length=5
kfdhdb.fgname: DATA1_0000 ; 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
kfdhdb.mfact: 454272 ; 0x0c0: 0x0006ee80
kfdhdb.dsksize: 32375 ; 0x0c4: 0x00007e77
kfdhdb.pmcnt: 2 ; 0x0c8: 0x00000002
kfdhdb.fstlocn: 1 ; 0x0cc: 0x00000001
kfdhdb.altlocn: 2 ; 0x0d0: 0x00000002
kfdhdb.f1b1locn: 2 ; 0x0d4: 0x00000002
kfdhdb.redomirrors[0]: 0 ; 0x0d8: 0x0000
kfdhdb.redomirrors[1]: 0 ; 0x0da: 0x0000
f1b1在AUN=2 ，那么FILE NUMBER 2的FILEDIR在 AUN=2 BLKN=2
[oracle@mlab2 ~]$ kfed read /oracleasm/asm-disk01 aus=4194304 aun=2 blkn=2|less
kfbh.endian: 1 ; 0x000: 0x01
kfbh.hard: 130 ; 0x001: 0x82
kfbh.type: 4 ; 0x002: KFBTYP_FILEDIR
kfbh.datfmt: 1 ; 0x003: 0x01
kfbh.block.blk: 2 ; 0x004: blk=2
kfbh.block.obj: 1 ; 0x008: file=1
kfbh.check: 523985651 ; 0x00c: 0x1f3b62f3
kfbh.fcn.base: 0 ; 0x010: 0x00000000
kfbh.fcn.wrap: 0 ; 0x014: 0x00000000
kfbh.spare1: 0 ; 0x018: 0x00000000
kfbh.spare2: 0 ; 0x01c: 0x00000000
kfffdb.node.incarn: 1 ; 0x000: A=1 NUMM=0x0
kfffdb.node.frlist.number: 4294967295 ; 0x004: 0xffffffff
kfffdb.node.frlist.incarn: 0 ; 0x008: A=0 NUMM=0x0
kfffdb.hibytes: 0 ; 0x00c: 0x00000000
kfffdb.lobytes: 1048576 ; 0x010: 0x00100000
kfffdb.xtntcnt: 3 ; 0x014: 0x00000003
kfffdb.xtnteof: 3 ; 0x018: 0x00000003
kfffdb.blkSize: 4096 ; 0x01c: 0x00001000
kfffdb.flags: 1 ; 0x020: O=1 S=0 S=0 D=0 C=0 I=0 R=0 A=0
kfffdb.fileType: 15 ; 0x021: 0x0f
kfffdb.dXrs: 19 ; 0x022: SCHE=0x1 NUMB=0x3
kfffdb.iXrs: 19 ; 0x023: SCHE=0x1 NUMB=0x3
kfffdb.dXsiz[0]: 4294967295 ; 0x024: 0xffffffff
kfffdb.dXsiz[1]: 0 ; 0x028: 0x00000000
kfffdb.dXsiz[2]: 0 ; 0x02c: 0x00000000
kfffdb.iXsiz[0]: 4294967295 ; 0x030: 0xffffffff
kfffdb.iXsiz[1]: 0 ; 0x034: 0x00000000
kfffdb.iXsiz[2]: 0 ; 0x038: 0x00000000
kfffdb.xtntblk: 3 ; 0x03c: 0x0003
kfffdb.break: 60 ; 0x03e: 0x003c
kfffdb.priZn: 0 ; 0x040: KFDZN_COLD
kfffdb.secZn: 0 ; 0x041: KFDZN_COLD
kfffdb.ub2spare: 0 ; 0x042: 0x0000
kfffdb.alias[0]: 4294967295 ; 0x044: 0xffffffff
kfffdb.alias[1]: 4294967295 ; 0x048: 0xffffffff
kfffdb.strpwdth: 0 ; 0x04c: 0x00
kfffdb.strpsz: 0 ; 0x04d: 0x00
kfffdb.usmsz: 0 ; 0x04e: 0x0000
kfffdb.crets.hi: 32999670 ; 0x050: HOUR=0x16 DAYS=0x7 MNTH=0x2 YEAR=0x7de
kfffdb.crets.lo: 1788966912 ; 0x054: USEC=0x0 MSEC=0x5e SECS=0x2a MINS=0x1a
kfffdb.modts.hi: 32999670 ; 0x058: HOUR=0x16 DAYS=0x7 MNTH=0x2 YEAR=0x7de
kfffdb.modts.lo: 1788966912 ; 0x05c: USEC=0x0 MSEC=0x5e SECS=0x2a MINS=0x1a
...............
kfffde[0].xptr.au: 2 ; 0x4a0: 0x00000002
kfffde[0].xptr.disk: 4 ; 0x4a4: 0x0004
kfffde[0].xptr.flags: 0 ; 0x4a6: L=0 E=0 D=0 S=0
kfffde[0].xptr.chk: 44 ; 0x4a7: 0x2c
kfffde[1].xptr.au: 3 ; 0x4a8: 0x00000003
kfffde[1].xptr.disk: 2 ; 0x4ac: 0x0002
kfffde[1].xptr.flags: 0 ; 0x4ae: L=0 E=0 D=0 S=0
kfffde[1].xptr.chk: 43 ; 0x4af: 0x2b
kfffde[2].xptr.au: 2 ; 0x4b0: 0x00000002
kfffde[2].xptr.disk: 8 ; 0x4b4: 0x0008
kfffde[2].xptr.flags: 0 ; 0x4b6: L=0 E=0 D=0 S=0
kfffde[2].xptr.chk: 32 ; 0x4b7: 0x20
其中一个extent pointer指向Disk 4的 AUN=2 ，
[oracle@mlab2 ~]$ kfed read /oracleasm/asm-disk05 aus=4194304 aun=2 blkn=0|less
kfbh.endian: 1 ; 0x000: 0x01
kfbh.hard: 130 ; 0x001: 0x82
kfbh.type: 6 ; 0x002: KFBTYP_DISKDIR
kfbh.datfmt: 1 ; 0x003: 0x01
kfbh.block.blk: 0 ; 0x004: blk=0
kfbh.block.obj: 2 ; 0x008: file=2
kfbh.check: 4277763909 ; 0x00c: 0xfef97f45
kfbh.fcn.base: 692 ; 0x010: 0x000002b4
kfbh.fcn.wrap: 0 ; 0x014: 0x00000000
kfbh.spare1: 0 ; 0x018: 0x00000000
kfbh.spare2: 0 ; 0x01c: 0x00000000
kffdnd.bnode.incarn: 1 ; 0x000: A=1 NUMM=0x0
kffdnd.bnode.frlist.number: 4294967295 ; 0x004: 0xffffffff
kffdnd.bnode.frlist.incarn: 0 ; 0x008: A=0 NUMM=0x0
kffdnd.overfl.number: 1 ; 0x00c: 0x00000001
kffdnd.overfl.incarn: 1 ; 0x010: A=1 NUMM=0x0
kffdnd.parent.number: 0 ; 0x014: 0x00000000
kffdnd.parent.incarn: 1 ; 0x018: A=1 NUMM=0x0
kffdnd.fstblk.number: 0 ; 0x01c: 0x00000000
kffdnd.fstblk.incarn: 1 ; 0x020: A=1 NUMM=0x0
kfddde[0].entry.incarn: 1 ; 0x024: A=1 NUMM=0x0
kfddde[0].entry.hash: 0 ; 0x028: 0x00000000
kfddde[0].entry.refer.number:4294967295 ; 0x02c: 0xffffffff
kfddde[0].entry.refer.incarn: 0 ; 0x030: A=0 NUMM=0x0
kfddde[0].dsknum: 0 ; 0x034: 0x0000
kfddde[0].state: 2 ; 0x036: KFDSTA_NORMAL
kfddde[0].ddchgfl: 132 ; 0x037: 0x84
kfddde[0].dskname: DATA1_0000 ; 0x038: length=10
kfddde[0].fgname: DATA1_0000 ; 0x058: length=10
kfddde[0].crestmp.hi: 32999670 ; 0x078: HOUR=0x16 DAYS=0x7 MNTH=0x2 YEAR=0x7de
kfddde[0].crestmp.lo: 1788720128 ; 0x07c: USEC=0x0 MSEC=0x36d SECS=0x29 MINS=0x1a
kfddde[0].failstmp.hi: 0 ; 0x080: HOUR=0x0 DAYS=0x0 MNTH=0x0 YEAR=0x0
kfddde[0].failstmp.lo: 0 ; 0x084: USEC=0x0 MSEC=0x0 SECS=0x0 MINS=0x0
kfddde[0].timer: 0 ; 0x088: 0x00000000
kfddde[0].size: 32375 ; 0x08c: 0x00007e77
kfddde[0].srRloc.super.hiStart: 0 ; 0x090: 0x00000000
kfddde[0].srRloc.super.loStart: 0 ; 0x094: 0x00000000
kfddde[0].srRloc.super.length: 0 ; 0x098: 0x00000000
kfddde[0].srRloc.incarn: 0 ; 0x09c: 0x00000000
kfddde[0].dskrprtm: 0 ; 0x0a0: 0x00000000
kfddde[0].zones[0].start: 0 ; 0x0a4: 0x00000000
kfddde[0].zones[0].size: 32375 ; 0x0a8: 0x00007e77
kfddde[0].zones[0].used: 9 ; 0x0ac: 0x00000009
kfddde[0].zones[0].spare: 0 ; 0x0b0: 0x00000000
kfddde[0].zones[0].classes[0].imbal[0]:7 ; 0x0b4: 0x00000007
kfddde[0].zones[0].classes[0].imbal[1]:0 ; 0x0b8: 0x00000000
kfddde[0].zones[0].classes[0].imbal[2]:0 ; 0x0bc: 0x00000000
kfddde[0].zones[0].classes[0].imbal[3]:0 ; 0x0c0: 0x00000000
kfddde[0].zones[0].classes[1].imbal[0]:0 ; 0x0c4: 0x00000000
kfddde[0].zones[0].classes[1].imbal[1]:0 ; 0x0c8: 0x00000000
kfddde[0].zones[0].classes[1].imbal[2]:0 ; 0x0cc: 0x00000000
kfddde[0].zones[0].classes[1].imbal[3]:0 ; 0x0d0: 0x00000000
kfddde[0].zones[0].classes[2].imbal[0]:0 ; 0x0d4: 0x00000000
kfddde[0].zones[0].classes[2].imbal[1]:0 ; 0x0d8: 0x00000000
KFBTYP_DISKDIR即DISK DIRECTORY的block type, 其他一些结构：
- kfddde[0].entry.incarn Common entry fields
- kfddde[0].dsknum Disk number [KEY]
- kfddde[0].state Disk state ，其中：
KFDSTA_INVALID 0) Illegal value
KFDSTA_UNKNOWN 1) OSM disk state not known
KFDSTA_NORMAL 2) Happy disk
KFDSTA_UNUSED 3) Unused State – Open
KFDSTA_DROPPING 4) Disk being dropped from group
KFDSTA_HUNG 5) Disk drop operation hung
KFDSTA_FORCING 6) Disk beinng drop forced
KFDSTA_DROPPED 7) Disk no longer part of group
KFDSTA_ADDING 8) Disk being globally validated
- kfddde[0].ddchgfl Bit flags for chngs
- kfddde[1].dskname: OSM disk name
- kfddde[1].fgname Fail group name
- kfddde[1].crestmp.hi /lo: Create timestamp
- kfddde[1].failstmp.hi/lo : Failure timestamp
- kfddde[1].timer: Failure timer
- kfddde[1].size: Resize target(AUs)
- kfddde[1].srRloc.super.hiStart/loStart Relative loc in SR
- kfddde[1].dskrprtm :Disk repair time
- kfddde[0].zones[0].start /size/used/spare : Zone information
写得有点烂.