Avamar DB2 备份失败，并在 db2diag 日志中出现错误“Unable to spawn Avdb2 for backup”，并出现错误 SQL2025N

Summary: Avamar DB2 备份失败或完成，但有例外情况。db2diag.log 在备份开始后不久显示供应商错误和 SQL2025N I/O 错误。 启用 avdb2 调试后，显示进程文件锁定错误。

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Symptoms

Avamar DB2 备份失败或完成，但有例外情况。db2diag.log 在备份开始后不久显示供应商错误和 SQL2025N I/O 错误。

avdb2 日志显示以下内容：

2023-01-13 02:30:10 avdb2 Info : Process 965860 (/usr/local/avamar/bin/avdb2) finished (code 170: completed with errors, client log should be examined)
2023-01-13 02:30:10 avdb2 Warning : CTL workorder "DB2_DB_0220-DBNAMEXDS01_DB-1673547600007#1" non-zero exit status 'code 170: completed with errors, client log should be examined'
2023-01-13 02:30:10 avdb2 Error : Unable to spawn Avdb2 for backup/restore of [db2inst1/DBNAME db2inst1/DBNAME].
2023-01-13 02:30:10 avdb2 Info : Process 966206 (/usr/local/avamar/bin/avtar) for workorder DB2_DB_0220-DBNAMEXDS01_DB-1673547600007#201 started
2023-01-13 02:30:10 avdb2 Info : Setting ctl message version to 3 (from 1)
2023-01-13 02:30:10 avdb2 Info : Setting ctl max message size to 268435456
2023-01-13 02:30:13 avdb2 Info : Process 966206 (/usr/local/avamar/bin/avtar) finished (code 0: success)
2023-01-13 02:30:13 avdb2 Error : Unable to get the list of backup images from the child process.
2023-01-13 02:30:13 avdb2 Info : Starting graceful (staged) termination, Unable to get the list of backup images from the child process. (wrap-up stage)


启用调试后，还可以看到与流程文件锁定类似的错误：

2023/01/12-18:20:04.79408 [ctl_conn_recv-DB2_DB_0220-DBNAMEXDS01_DB-1673547600007#1] ctl_connection::lowdata:
recv:

 

备份启动后 db2diag.log 中的错误： 
2023-01-17-03.30.03.849521+480 I300934E909 LEVEL: Error
PID : 9696 TID : 140540540610304 PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : DBNAME
APPHDL : 0-55065 APPID: *LOCAL.db2inst1.230116193009
AUTHID : DB2INST1 HOSTNAME: db2hostname
EDUID : 32933 EDUNAME: db2med.30870.0 (DBNAME) 0
FUNCTION: DB2 UDB, database utilities, sqluMapVend2MediaRCWithLog, probe:699
DATA #1 : String, 144 bytes
Vendor error: rc = 25 returned from function sqluvput.
Return_code structure from vendor library /usr/local/avamar/lib/libdb2_avamarloader.so:

DATA #2 : Hexdump, 48 bytes
0x00007FD47978F350 : 1701 0000 4176 7461 7220 496E 7075 742F ....Avtar Input/
0x00007FD47978F360 : 4F75 7470 7574 2065 7272 6F72 2E00 0000 Output error....
0x00007FD47978F370 : 0000 0000 0000 0000 0000 0000 0000 0000 ................

2023-01-17-03.30.04.850521+480 E301844E535 LEVEL: Error
PID : 9696 TID : 140540540610304 PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : DBNAME
APPHDL : 0-55065 APPID: *LOCAL.db2inst1.230116193009
AUTHID : DB2INST1 HOSTNAME: db2hostname
EDUID : 32933 EDUNAME: db2med.30870.0 (DBNAME) 0
FUNCTION: DB2 UDB, database utilities, sqluMCWriteToDevice, probe:1304
MESSAGE : Media controller -- problem writing to vendor device. rc = -2025

2023-01-17-03.30.04.850898+480 E302380E571 LEVEL: Error
PID : 9696 TID : 140540540610304 PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : DBNAME
APPHDL : 0-55065 APPID: *LOCAL.db2inst1.230116193009
AUTHID : DB2INST1 HOSTNAME: db2hostname
EDUID : 32933 EDUNAME: db2med.30870.0 (DBNAME) 0
FUNCTION: DB2 UDB, database utilities, sqluMCWriteToDevice, probe:1304
MESSAGE : SQL2025N An I/O error occurred. Error code: "". Media on which this
error occurred: "".

Cause

发生此错误是因为 Avamar /usr/local/avamar/var/clientlogs 目录的用户或权限不正确。

在本例中导致问题的 不正确权限示例： 
drwxr-xr-x 2 root root 20480 Jan 17 08:00 clientlogs

Resolution

对于用于备份作业的 db2 用户和组，目录至少需要读取+执行权限。

下面是可用于解决问题的示例命令。必须对此进行调整，以匹配操作系统 Avamar 路径和 db2 管理员组名称。

命令必须以 root 用户身份运行。 
chown root:db2iadm1 /usr/local/avamar/var/clientlogs

设置最小权限的命令示例： 
chmod 755 /usr/local/avamar/var/clientlogs


Affected Products

Avamar Client, Avamar Plug-in for IBM DB2, Avamar Server
Article Properties
Article Number: 000210810
Article Type: Solution
Last Modified: 02 Jun 2023
Version:  2
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