在安装grid的时候，常常会遇到不能访问磁盘，原来习惯使用dd命令来测试对磁盘的读写权限，其实ASM提供kfod命令来测试对grid是否对磁盘有访问权限
下面是测试使用kfod命令来测试对磁盘是否有访问权限。
1，版本介绍
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[grid@www.htz.pw ~]$lsb_release -a LSB Version: :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch Distributor ID: RedHatEnterpriseServer Description: Red Hat Enterprise Linux Server release 6.5 (Santiago) Release: 6.5 Codename: Santiago |
2，查看磁盘名字
这里使用的multipath来固定磁盘命令，习惯了使用multipath，觉得使用asmlib,udev来固定磁盘命令都是在多路径软件上面增加一步，本来磁盘聚合的时候就可以固定磁盘名字，就没有必要再使用其它软件来实现了。不过从RHEL 6开始,multipath不能更改权限，需要使用到udev。
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[root@www.htz.pw ~]#multipath -ll asm2 (36000c29ca5ab0cd5649a66fa333180a0) dm-3 VMware,,VMware Virtual S size=20G features=’0′ hwhandler=’0′ wp=rw `-+- policy=’round-robin 0′ prio=1 status=active `- 2:0:2:0 sdc 8:32 active ready running asm1 (36000c296a51a699a8d04a746a3b31e23) dm-2 VMware,,VMware Virtual S size=20G features=’0′ hwhandler=’0′ wp=rw `-+- policy=’round-robin 0′ prio=1 status=active `- 2:0:1:0 sdb 8:16 active ready running |
3，kfod命令
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[grid@www.htz.pw ~]$kfod -help _asm_a/llow_only_raw_disks KFOD allow only raw devices [_asm_allow_only_raw_disks=TRUE/(FALSE)] _asm_l/ibraries ASM Libraries[_asm_libraries=lib1,lib2,…] _asms/id ASM Instance[_asmsid=sid] a/sm_diskstring ASM Diskstring [asm_diskstring=discoverystring, discoverystring …] c/luster KFOD cluster [cluster=TRUE/(FALSE)] db/_unique_name db_unique_name for ASM instance[db_unique_name=dbname] di/sks Disks to discover [disks=raw,asm,all] ds/cvgroup Include group name [dscvgroup=TRUE/(FALSE)] g/roup Disks in diskgroup [group=diskgroup] h/ostlist hostlist[hostlist=host1,host2,…] metadata_a/usize AU Size for Metadata Size Calculation metadata_c/lients Client Count for Metadata Size Calculation metadata_d/isks Disk Count for Metadata Size Calculation metadata_n/odes Node Count for Metadata Size Calculation metadata_r/edundancy Redundancy for Metadata Size Calculation n/ohdr KFOD header suppression [nohdr=TRUE/(FALSE)] o/p KFOD options type [OP=DISKS/CANDIDATES/MISSING/GROUPS/INSTS/VERSION/CLIENTS/RM/RMVERS/DFLTDSTR/GPNPDSTR/METADATA/ALL] p/file ASM parameter file [pfile=parameterfile] s/tatus Include disk header status [status=TRUE/(FALSE)] v/erbose KFOD verbose errors [verbose=TRUE/(FALSE)]
[grid@www.htz.pw ~]$kfod asm_diskstring=’/dev/mapper/*’ disks=all ——————————————————————————– Disk Size Path User Group ================================================================================ 1: 20480 Mb /dev/mapper/asm1 grid oinstall 2: 20480 Mb /dev/mapper/asm2 grid oinstall KFOD-00301: Unable to contact Cluster Synchronization Services (CSS). Return code 2 from kgxgncin. KFOD-00311: Error scanning device /dev/mapper/control ORA-15025: could not open disk "/dev/mapper/control" Linux-x86_64 Error: 13: Permission denied Additional information: 42 KFOD-00311: Error scanning device /dev/mapper/vg_asm11g-lv_root ORA-15025: could not open disk "/dev/mapper/vg_asm11g-lv_root" Linux-x86_64 Error: 13: Permission denied Additional information: 42 KFOD-00311: Error scanning device /dev/mapper/vg_asm11g-lv_swap ORA-15025: could not open disk "/dev/mapper/vg_asm11g-lv_swap" Linux-x86_64 Error: 13: Permission denied Additional information: 42 这里我们能发现有2块磁盘GRID用户可以正常访问，并且也显示了用户与组
下面来看看磁盘的权限 [grid@www.htz.pw ~]$ls -l /dev/mapper/* lrwxrwxrwx 1 root root 7 Aug 30 04:15 /dev/mapper/asm1 -> ../dm-2 lrwxrwxrwx 1 root root 7 Aug 30 04:15 /dev/mapper/asm2 -> ../dm-3 crw-rw—- 1 root root 10, 58 Aug 30 03:50 /dev/mapper/control lrwxrwxrwx 1 root root 7 Aug 30 03:50 /dev/mapper/vg_asm11g-lv_root -> ../dm-0 lrwxrwxrwx 1 root root 7 Aug 30 03:50 /dev/mapper/vg_asm11g-lv_swap -> ../dm-1 [grid@www.htz.pw ~]$ls -l /dev/dm* brw-rw—- 1 root disk 253, 0 Aug 30 03:50 /dev/dm-0 brw-rw—- 1 root disk 253, 1 Aug 30 03:50 /dev/dm-1 brw-rw—- 1 grid oinstall 253, 2 Aug 30 04:15 /dev/dm-2 brw-rw—- 1 grid oinstall 253, 3 Aug 30 04:15 /dev/dm-3
再来看看grid用户的属主 [grid@www.htz.pw ~]$id grid uid=501(grid) gid=501(oinstall) groups=501(oinstall),502(dba) 这里只创建了dba与oinstall组，并没有创建其它的asmadmin,asmoper等组，越多组，越容易出错，最经典的就是grid/oracle用户下面oracle命令的属主导致的问题。 |
kfod测试grid用户对磁盘的访问权限：等您坐沙发呢！