之前创建asm磁盘的时候总结过一下错误：http://blog.csdn.net/rhys_oracle/article/details/17029333

当今天情况是这样的。如下：

在使用openfiler通过iSCSI映射到本地，发现将整个磁盘创建为asm提示如下错误：

[root@rac1 iscsi]# /etc/init.d/oracleasm createdisk VOL1 /dev/sdhMarking disk "VOL1" as an ASM disk: [FAILED][root@rac1 iscsi]# tail -5 /var/log/oracleasm Cleaning any stale ASM disks...Scanning system for ASM disks...Device "/dev/sdg" is not a partitionDevice "/dev/sdh" is not a partitionDevice "/dev/sdh" is not a partition[root@rac1 iscsi]# 

提示不是一个分区。这是为什么呢？

  因为：挂载到本地的iSCSI磁盘一定要分区后再使用，而且分区一定要是主分区。如果挂载的单张磁盘大于2TB，使用parted工具创建分区（fdisk不支持在大于2.2TB的磁盘上创建分区）。

重新分区：

[root@rac1 iscsi]# fdisk /dev/sdhDevice contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0xcf1af59a.Changes will remain in memory only, until you decide to write them.After that, of course, the previous content won't be recoverable.Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)WARNING: DOS-compatible mode is deprecated. It's strongly recommended to         switch off the mode (command 'c') and change display units to         sectors (command 'u').Command (m for help): nCommand action   e   extended   p   primary partition (1-4)pPartition number (1-4): 1First cylinder (1-10240, default 1): Using default value 1Last cylinder, +cylinders or +size{K,M,G} (1-10240, default 10240): Using default value 10240Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.[root@rac1 iscsi]# 

重新创建asm磁盘：

[root@rac1 iscsi]# /etc/init.d/oracleasm createdisk VOL1 /dev/sdh1Marking disk "VOL1" as an ASM disk: [  OK  ][root@rac1 iscsi]# 

Device "/dev/sdg" is not a partition【再续】