关于oracle asm磁盘组支持的LUN磁盘最大值

wangshengmao

   我用的存储是xiv，给数据库划出4个磁盘，每个LUN磁盘设置为2T，服务器用的是power 780,操作系统是aix6.1,oracle使用oracle 11g R2版本
  在使用asmca配置asm磁盘组的时候，发现找不到LUN磁盘，磁盘的权限我已经设置好了
  最后通过sql语句配置asm磁盘组，提示超出最大值2048G，然后缩小LUN磁盘大小到1999G，仍然提示超出最大值
  

  当我把LUN磁盘缩小到500G的时候，配置磁盘组就可以看到磁盘了，也能正常加入asm磁盘组了，谁知道oracle配置asm磁盘组的时候，支持一个LUN磁盘最大是多少吗?

wangshengmao

居然没人解答，太心寒了

l495051275

你多尝试尝试，然后找到那个最大值!!让我们都知道下！！！:wink:

ahyan

问题解决了？ASM支持的LUN大小是有限制的。

milujite

If you use ASM you do not have any filesystem in ASM (yet). Therefore no restrictions of filesystems will apply to ASM. The database will directly access the ASM Diskgroups and the diskgroup will either consist of block devices (dev/sd*) or character (raw) devices (dev/raw/raw*).
There is one limit to the size of an ASM Disk which is 4 PB (if you storage system can provide such a lun).
However even if you have any circumstances preventing you from having block devices/partitions etc bigger than 2 TB what you would do is create a diskgroup with multiple disk in it. Since you can have 10000 ASM Disks in one Diskgroup (e.g. +DATA) that gives you some space.
Best practices is really to have only 2 Diskgroups one for the DATA and one for the Flashback Recovery Area.
Here is a very good whitepaper for this:
http://www.oracle.com/technology ... actices%2009-07.pdf

Regards
Sebastian

大意就是如果使用asm直接管理raw设备，可以达到4PB，但是如果使用asm和ext3有2T限制，既然用了ASM，为啥还要去弄什么EXT3.

dengbao2001

论坛回答问题只是大家义务帮忙的，没有人有责任一定要帮你，这是你将问题提交到论坛首先到明白的一个道理。

既然你用了P，又用了Oracle，只要购买了服务，完全去可以咨询ORAcle，人家会有义务有责任回答客户的任何问题