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cost of turning off rebalance of ASM diskgroup

One time I turned of the rebalance of ASM diskgroup when adding new disk and forgot about it until the developer told me that they run into error ORA-01653, unable to extend table in tablespace.
 
Usually this is caused by a few scenarios(no space on disk, data file reach to max, datafile is not auextensible etc), but this time it's caused by asm disk not balanced.

the datafile is 16GB, let me try to extend it to 20GB.

14:14:56 RMS8DEV> alter database datafile 26 resize 20000m;
alter database datafile 26 resize 20000m
*
ERROR at line 1:
ORA-01237: cannot extend datafile 26
ORA-01110: data file 26: '+DATA2/rms8dev/datafile/radiostage_data.282.819106481'
ORA-17505: ksfdrsz:1 Failed to resize file to size 2560000 blocks
ORA-15041: diskgroup "DATA2" space exhausted

it failed, but the disk /dev/rhdisk18 has 79GB free space! why cannot I use it?

ASMCMD [+] > lsdsk -k
Total_MB  Free_MB   OS_MB  Name        Failgroup   Failgroup_Type  Library  Label  UDID  Product  Redund   Path
  102400    88217  102400  FRA_0001    FRA_0001    REGULAR         System                         UNKNOWN  /dev/rhdisk15
  102400    98882  102400  FRA2_0000   FRA2_0000   REGULAR         System                         UNKNOWN  /dev/rhdisk16
  102400    79326  102400  DATA2_0006  DATA2_0006  REGULAR         System                         UNKNOWN  /dev/rhdisk18
  102400      114  102400  DATA2_0000  DATA2_0000  REGULAR         System                         UNKNOWN  /dev/rhdisk2
  102400      110  102400  DATA2_0001  DATA2_0001  REGULAR         System                         UNKNOWN  /dev/rhdisk3
  102400      104  102400  DATA2_0002  DATA2_0002  REGULAR         System                         UNKNOWN  /dev/rhdisk4
  102400      105  102400  DATA2_0003  DATA2_0003  REGULAR         System                         UNKNOWN  /dev/rhdisk5
  102400      102  102400  DATA2_0004  DATA2_0004  REGULAR         System                         UNKNOWN  /dev/rhdisk6
  102400      106  102400  DATA2_0005  DATA2_0005  REGULAR         System                         UNKNOWN  /dev/rhdisk7

Let me rebalance the diskgroup and retry the file extension.

SQL> alter diskgroup data2 rebalance power 11;

Diskgroup altered.

After the rebalance complete, it's balanced as shown below.

[agcoux136:grid:/home/grid]asmcmd lsdsk -k
Total_MB  Free_MB   OS_MB  Name        Failgroup   Failgroup_Type  Library  Label  UDID  Product  Redund   Path
  102400    88217  102400  FRA_0001    FRA_0001    REGULAR         System                         UNKNOWN  /dev/rhdisk15
  102400    98882  102400  FRA2_0000   FRA2_0000   REGULAR         System                         UNKNOWN  /dev/rhdisk16
  102400    11309  102400  DATA2_0006  DATA2_0006  REGULAR         System                         UNKNOWN  /dev/rhdisk18
  102400    11311  102400  DATA2_0000  DATA2_0000  REGULAR         System                         UNKNOWN  /dev/rhdisk2
  102400    11310  102400  DATA2_0001  DATA2_0001  REGULAR         System                         UNKNOWN  /dev/rhdisk3
  102400    11309  102400  DATA2_0002  DATA2_0002  REGULAR         System                         UNKNOWN  /dev/rhdisk4
  102400    11310  102400  DATA2_0003  DATA2_0003  REGULAR         System                         UNKNOWN  /dev/rhdisk5
  102400    11308  102400  DATA2_0004  DATA2_0004  REGULAR         System                         UNKNOWN  /dev/rhdisk6
  102400    11310  102400  DATA2_0005  DATA2_0005  REGULAR         System                         UNKNOWN  /dev/rhdisk7

Let me try to extend the datafile from 16GB to 20GB.

14:16:35 RMS8DEV> alter database datafile 26 resize 20000m;

Database altered.

Elapsed: 00:00:12.51
15:04:00 RMS8DEV>

it's working now! 


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