标签归档：OSD-04016

OSD-04016: 异步 I/O 请求排队时出错

发表于 2018 年 2 月 27 日由惜分飞

有某客户由于硬件故障，导致数据库无法启动，让我们介入处理
数据库启动报错

Mon Feb 26 17:28:24 2018
ALTER DATABASE OPEN
Beginning crash recovery of 1 threads
 parallel recovery started with 3 processes
Started redo scan
Completed redo scan
 read 2054 KB redo, 509 data blocks need recovery
Started redo application at
 Thread 1: logseq 41341, block 54
Recovery of Online Redo Log: Thread 1 Group 1 Seq 41341 Reading mem 0
  Mem# 0: E:\ORADATA\ORCL\REDO01.LOG
Completed redo application of 1.77MB
KCF: read, write or open error, block=0x16439 online=1
        file=1 'E:\ORADATA\ORCL\SYSTEM01.DBF'
        error=27070 txt: 'OSD-04016: 异步 I/O 请求排队时出错。
O/S-Error: (OS 1) 函数不正确。'
Errors in file d:\oracle\diag\rdbms\orcl\orcl\trace\orcl_dbw0_4928.trc:
ORA-01243: system tablespace file suffered media failure
ORA-01114: IO error writing block to file 1 (block # 91193)
ORA-01110: data file 1: 'E:\ORADATA\ORCL\SYSTEM01.DBF'
ORA-27070: async read/write failed
OSD-04016: 异步 I/O 请求排队时出错。
O/S-Error: (OS 1) 函数不正确。
DBW0 (ospid: 4928): terminating the instance due to error 1243
Mon Feb 26 17:28:29 2018
Instance terminated by DBW0, pid = 4928

这里错误比较明显，由于io错误，在数据库实例恢复之时，写回block正好在该损坏位置从而使得数据库无法正常实例恢复,进而无法open.

dbv验证文件
通过专业工具对system文件进行了重构system文件,然后dbv检查结果如下


DBVERIFY: Release 11.2.0.1.0 - Production on 星期二 2月 27 17:20:14 2018

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.


DBVERIFY - 开始验证: FILE = D:\OK\SYSTEM01.DBF
页 91156 标记为损坏
Corrupt block relative dba: 0x00416414 (file 1, block 91156)
Bad header found during dbv: 
Data in bad block:
 type: 229 format: 6 rdba: 0xe1d9e3e7
 last change scn: 0xd682.ffc8c7cb seq: 0x8c flg: 0x8c
 spare1: 0xc0 spare2: 0xf6 spare3: 0x70b3
 consistency value in tail: 0x71f50602
 check value in block header: 0x8195
 computed block checksum: 0x8689


DBVERIFY - 验证完成

检查的页总数: 215040
处理的页总数 (数据): 178112
失败的页总数 (数据): 0
处理的页总数 (索引): 19070
失败的页总数 (索引): 0
处理的页总数 (其他): 3118
处理的总页数 (段)  : 1
失败的总页数 (段)  : 0
空的页总数: 14739
标记为损坏的总页数: 1
流入的页总数: 0
加密的总页数        : 0
最高块 SCN            : 1638554501 (0.1638554501)

这里比较明显重构出来的system文件只有block 91156坏块,这里注意和没有处理之前的坏块不一样

通过dump分析坏块所属对象

Start dump data block from file D:\OK\SYSTEM01.DBF minblk 91156 maxblk 91156
 V10 STYLE FILE HEADER:
	Compatibility Vsn = 186646528=0xb200000
	Db ID=1383974140=0x527dc4fc, Db Name='ORCL'
	Activation ID=0=0x0
	Control Seq=806694=0xc4f26, File size=215040=0x34800
	File Number=1, Blksiz=8192, File Type=3 DATA
Dump all the blocks in range:
buffer tsn: 0 rdba: 0xe1d9e3e7 (903/1696743)
scn: 0xd682.ffc8c7cb seq: 0x8c flg: 0x8c tail: 0x71f50602
frmt: 0x06 chkval: 0x8195 type: 0xe5=unknown
Hex dump of corrupt header 4 = CORRUPT

Start dump data block from file D:\OK\SYSTEM01.DBF minblk 91155 maxblk 91155
 V10 STYLE FILE HEADER:
	Compatibility Vsn = 186646528=0xb200000
	Db ID=1383974140=0x527dc4fc, Db Name='ORCL'
	Activation ID=0=0x0
	Control Seq=806694=0xc4f26, File size=215040=0x34800
	File Number=1, Blksiz=8192, File Type=3 DATA
Dump all the blocks in range:
buffer tsn: 0 rdba: 0x00416413 (1/91155)
scn: 0x0000.613ad8d6 seq: 0x01 flg: 0x06 tail: 0xd8d60601
frmt: 0x02 chkval: 0xcc5f type: 0x06=trans data
Hex dump of block: st=0, typ_found=1

Block header dump:  0x00416413
 Object id on Block? Y
 seg/obj: 0x25  csc: 0x00.613ad8ce  itc: 2  flg: -  typ: 2 - INDEX
     fsl: 0  fnx: 0x0 ver: 0x01
 
 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0009.000.0016fda0  0x00c0130e.6f38.01  CB--    0  scn 0x0000.3e6ed294
0x02   0x0009.008.0023e862  0x00c002cf.a217.13  --U-    1  fsc 0x0000.613ad8d6


Start dump data block from file D:\OK\SYSTEM01.DBF minblk 91157 maxblk 91157
 V10 STYLE FILE HEADER:
	Compatibility Vsn = 186646528=0xb200000
	Db ID=1383974140=0x527dc4fc, Db Name='ORCL'
	Activation ID=0=0x0
	Control Seq=806694=0xc4f26, File size=215040=0x34800
	File Number=1, Blksiz=8192, File Type=3 DATA
Dump all the blocks in range:
buffer tsn: 0 rdba: 0x00416415 (1/91157)
scn: 0x0000.6193dc0c seq: 0x01 flg: 0x06 tail: 0xdc0c0601
frmt: 0x02 chkval: 0x8c21 type: 0x06=trans data
Hex dump of block: st=0, typ_found=1

Block header dump:  0x00416415
 Object id on Block? Y
 seg/obj: 0x25  csc: 0x00.6193dc04  itc: 2  flg: -  typ: 2 - INDEX
     fsl: 0  fnx: 0x0 ver: 0x01
 
 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0006.00c.001ee103  0x00c008a5.8dbd.02  C---    0  scn 0x0000.57303e03
0x02   0x000b.00f.00053100  0x00c008af.1563.09  --U-    1  fsc 0x0000.6193dc0c

这里比较明显，可以确定坏块为index，object_id=0×25=37,通过查询其他库，确定为i_obj2(obj$的index)

使用该文件启动数据库

SQL> alter database rename file 'E:\ORADATA\ORCL\SYSTEM01.DBF' to 'd:\orcl\SYSTEM01.DBF';

数据库已更改。

SQL> recover database;
完成介质恢复。
SQL> alter database open;

数据库已更改。

检查alert日志
发现smon进程由于坏块的存储，出现大量报错,需要处理,不然数据库一段时间后就会crash.

Tue Feb 27 20:31:23 2018
QMNC started with pid=27, OS id=4652 
Completed: alter database open
Tue Feb 27 20:31:25 2018
Starting background process CJQ0
Tue Feb 27 20:31:25 2018
CJQ0 started with pid=30, OS id=2172 
Tue Feb 27 20:31:25 2018
db_recovery_file_dest_size of 3912 MB is 0.00% used. This is a
user-specified limit on the amount of space that will be used by this
database for recovery-related files, and does not reflect the amount of
space available in the underlying filesystem or ASM diskgroup.
Hex dump of (file 1, block 91156) in trace file d:\oracle\diag\rdbms\orcl\orcl\trace\orcl_cjq0_2172.trc
Corrupt block relative dba: 0x00416414 (file 1, block 91156)
Bad header found during multiblock buffer read
Data in bad block:
 type: 229 format: 6 rdba: 0xe1d9e3e7
 last change scn: 0xd682.ffc8c7cb seq: 0x8c flg: 0x8c
 spare1: 0xc0 spare2: 0xf6 spare3: 0x70b3
 consistency value in tail: 0x71f50602
 check value in block header: 0x8195
 computed block checksum: 0x8689
Reading datafile 'D:\ORCL\SYSTEM01.DBF' for corruption at rdba: 0x00416414 (file 1, block 91156)
Reread (file 1, block 91156) found same corrupt data
Errors in file d:\oracle\diag\rdbms\orcl\orcl\trace\orcl_smon_3992.trc  (incident=77085):
ORA-01578: ORACLE data block corrupted (file # 1, block # 91156)
ORA-01110: data file 1: 'D:\ORCL\SYSTEM01.DBF'
Incident details in: d:\oracle\diag\rdbms\orcl\orcl\incident\incdir_77085\orcl_smon_3992_i77085.trc
Errors in file d:\oracle\diag\rdbms\orcl\orcl\trace\orcl_cjq0_2172.trc  (incident=77221):
ORA-01578: ORACLE data block corrupted (file # 1, block # 91156)
ORA-01110: data file 1: 'D:\ORCL\SYSTEM01.DBF'
Incident details in: d:\oracle\diag\rdbms\orcl\orcl\incident\incdir_77221\orcl_cjq0_2172_i77221.trc

重建i_obj2 index，参考：//www.xifenfei.com/?p=5566

发表在 Oracle备份恢复 | 标签为 io异常恢复, ORA-27070, OSD-04016 | 评论关闭

一次侥幸的OSD-04016 O/S-Error异常恢复

发表于 2013 年 5 月 17 日由惜分飞

一台数据库因为异常断电导致硬盘IO出现O/S-Error: (OS 23) 数据错误(循环冗余检查)错误，使得datafile 6无法完成实例恢复.使用dbv检查该数据文件也出现类似错误,尝试copy该文件,也出现了类似的错误.尝试dd拷贝完整,发现dd也只能拷贝81951个block.

Tue May 14 15:32:10 2013
Completed redo scan
 16941 redo blocks read, 1106 data blocks need recovery
Tue May 14 15:32:17 2013
Errors in file d:\oracle\product\10.2.0\admin\water\bdump\water_p002_1472.trc:
ORA-01115: IO error reading block from file 6 (block # 81951)
ORA-01110: data file 6: 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\WATER\YD_DATA01.DBF'
ORA-27070: async read/write failed
OSD-04016: 异步 I/O 请求排队时出错。
O/S-Error: (OS 23) 数据错误(循环冗余检查)。

因为该数据库有一天前的备份,而且他们只要求恢复其中三张核心表的数据,通过分析数据字典,确定出来相关表的block均不在block 81951之上,也就是说,如果数据库只是该block异常了,可以通过跳过该block,从而copy相关block,来实现数据库恢复,因为是一个文件的中间部分异常了,所以决定使用dd来copy文件正常部分

dd if=D:\ORACLE\PRODUCT\10.2.0\ORADATA\WATER\YD_DATA01.DBF bs=8192 count=81951 of=h:\dd\yd_data01_1.dbf
dd if=D:\ORACLE\PRODUCT\10.2.0\ORADATA\WATER\YD_DATA01.DBF bs=8192  skip=81952   of=h:\dd\yd_data01_2.dbf

dd出来文件之后,因为我们跳过了block 81952(block 0 数据库为记录),所以我们需要通过dd来构造block 81952,并且把他们合并到一起

dd if=/dev/zero of=h:\dd\yd_data01_1.dbf seek=81951 bs=8192 count=1
dd if=h:\dd\yd_data01_2.dbf seek=81952 bs=8192 of=h:\dd\yd_data01_1.dbf

然后使用dul工具抽出来客户需要的三张核心表的数据,恢复工作算完成。
针对本次恢复,如果需求是open数据库,通过设置隐含参数,bbed之类原则上也可以实现.
这次的恢复算是比较侥幸:1.客户有一天前的exp,只需要恢复三张核心表数据;2.三张表的数据恰好都不在损坏的block中;3.数据库就损坏了一个block.
如果出现不幸情况,那可能需要先硬盘恢复,然后数据库恢复,最后折腾数据.
总之再次提醒各位:数据库备份很重要,很重要.对于需求是不能丢失数据的系统备份,一定要rman的方式备份,千万别选择exp/expdp

发表在非常规恢复 | 标签为 O/S-Error, OSD-04016 | 一条评论

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一次侥幸的OSD-04016 O/S-Error异常恢复

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