先给大家拜个晚年！
小弟用两台RedHat 5.5企业版安装了10g的RAC，用ASM管理表空间，使用一个SAN的存储，存储上大概有1T的空间，分了500G给ASM，现在一年多过去了，空间快满了，想再划200G给ASM，应该怎么操作？
还有，现在的USER表空间占了80G，可以清理吗？
小弟是小白鼠，只懂一点点开发，对于主机和ORACLE的配置知识了解的很少，所以请各种大侠说的仔细一点。
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ASM往你的磁盘组添加磁盘即可，会进行自动平衡的
alter diskgroup ****
add
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往diskgroup添加一个disk就成。
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reblance时、你可能需关注一下、
给你看个OCP考题：
16. Immediately after adding a new disk to or removing an existing disk from an Automatic Storage Management (ASM) instance,
you find that the performance of the database decreases initially, until the addition or removal process is completed.
Performance then gradually returns to normal levels.
Which two activities could you perform to maintain a consistent performance of the database while adding or removing disks? (Choose two.)
A. increase the number of checkpoint processes
B. define the POWER option while adding or removing the disks
C. increase the number of DBWR processes by setting up a higher value for DB_WRITER_PROCESSES
D. increase the number of slave database writer processes by setting up a higher value for DBWR_IO_SLAVES
E. increase the number of ASM Rebalance processes by setting upa higher value for ASM_POWER_LIMIT during the disk addition or removal
Answer: B, E