有些时候EST_MINUTES的值可能并不能给你太多的证据，我们还可以看到SOFAR（截止目前移动的UA数）的值一直在增加，恩，不错，这是一个很好的一个观察指标。ASM的alert日志中也显示了删除磁盘的操作，以及OS ARB0进程的ID，ASM用它用来做所有的rebalance工作。更重要的，整个过程之中，没有任何的错误输出：
SQL> alter diskgroup testdg drop disk TESTDG_0000
NOTE: GroupBlock outside rolling migration privileged region
NOTE: requesting all-instance membership refresh for group=5
Tue Jan 10 14:49:01 2017
GMON updating for reconfiguration, group 5 at 222 for pid 42, osid 6197
NOTE: group 5 PST updated.
Tue Jan 10 14:49:01 2017
NOTE: membership refresh pending for group 5/0x97f863e8 (TESTDG)
GMON querying group 5 at 223 for pid 18, osid 5012
SUCCESS: refreshed membership for 5/0x97f863e8 (TESTDG)
NOTE: starting rebalance of group 5/0x97f863e8 (TESTDG) at power 1
Starting background process ARB0
SUCCESS: alter diskgroup testdg drop disk TESTDG_0000
Tue Jan 10 14:49:04 2017
ARB0 started with pid=39, OS id=25416
NOTE: assigning ARB0 to group 5/0x97f863e8 (TESTDG) with 1 parallel I/O
cellip.ora not found.
NOTE: F1X0 copy 1 relocating from 0:2 to 2:2 for diskgroup 5 (TESTDG)
NOTE: F1X0 copy 3 relocating from 2:2 to 3:2599 for diskgroup 5 (TESTDG)
Tue Jan 10 14:49:13 2017
NOTE: Attempting voting file refresh on diskgroup TESTDG
NOTE: Refresh completed on diskgroup TESTDG. No voting file found.
Tue Jan 10 14:51:05 2017
NOTE: stopping process ARB0
SUCCESS: rebalance completed for group 5/0x97f863e8 (TESTDG)
Tue Jan 10 14:51:07 2017
NOTE: GroupBlock outside rolling migration privileged region
NOTE: requesting all-instance membership refresh for group=5
Tue Jan 10 14:51:10 2017
GMON updating for reconfiguration, group 5 at 224 for pid 39, osid 25633
NOTE: group 5 PST updated.
SUCCESS: grp 5 disk TESTDG_0000 emptied
NOTE: erasing header on grp 5 disk TESTDG_0000
NOTE: process _x000_+asm1 (25633) initiating offline of disk 0.3915944675 (TESTDG_0000) with mask 0x7e in group 5
NOTE: initiating PST update: grp = 5, dsk = 0/0xe96892e3, mask = 0x6a, op = clear
GMON updating disk modes for group 5 at 225 for pid 39, osid 25633
NOTE: group TESTDG: updated PST location: disk 0001 (PST copy 0)
NOTE: group TESTDG: updated PST location: disk 0002 (PST copy 1)
NOTE: group TESTDG: updated PST location: disk 0003 (PST copy 2)
NOTE: PST update grp = 5 completed successfully
NOTE: initiating PST update: grp = 5, dsk = 0/0xe96892e3, mask = 0x7e, op = clear
GMON updating disk modes for group 5 at 226 for pid 39, osid 25633
NOTE: cache closing disk 0 of grp 5: TESTDG_0000
NOTE: PST update grp = 5 completed successfully
GMON updating for reconfiguration, group 5 at 227 for pid 39, osid 25633
NOTE: cache closing disk 0 of grp 5: (not open) TESTDG_0000
NOTE: group 5 PST updated.
NOTE: membership refresh pending for group 5/0x97f863e8 (TESTDG)
GMON querying group 5 at 228 for pid 18, osid 5012
GMON querying group 5 at 229 for pid 18, osid 5012
NOTE: Disk TESTDG_0000 in mode 0x0 marked for de-assignment
SUCCESS: refreshed membership for 5/0x97f863e8 (TESTDG)
Tue Jan 10 14:51:16 2017
NOTE: Attempting voting file refresh on diskgroup TESTDG
NOTE: Refresh completed on diskgroup TESTDG. No voting file found.
因此ASM预估了9分钟的时间来完成rebalance，但实际上只使用了2分钟的时候,因此首先能知道rebalance正在做什么非常重要，然后才能知道rebalance什么时候能完成。注意，估算的时间是动态变化的，可能会增加或减少，这个依赖你的系统负载变化，以及你的rebalance的power值的设置，对于一个非常大容量的磁盘组来说，可能rebalance会花费你数小时甚至是数天的时间。
ARB0进程的跟踪文件也显示了，当前正在对哪一个ASM文件的extent的在进行重分配，也是通过这个跟踪文件，我们可以知道ARB0确实是在干着自己的本职工作，没有偷懒。
[grid@jyrac1 trace]$ tail -f +ASM1_arb0_25416.trc
*** 2017-01-10 14:49:20.160
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:24.081
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:28.290
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:32.108
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:35.419
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:38.921
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:43.613
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:47.523
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:51.073
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:54.545
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:49:58.538
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:02.944
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:06.428
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:10.035
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:13.507
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:17.526
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:21.692
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:25.649
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:29.360
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:33.233
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:37.287
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:40.843
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:44.356
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:48.158
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:51.854
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:55.568
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:50:59.439
ARB0 relocating file +TESTDG.256.932913341 (120 entries)
*** 2017-01-10 14:51:02.877
ARB0 relocating file +TESTDG.256.932913341 (50 entries)