Oracle ASM keeps redundancy quite simple by providing only 3 options. you can choose to have no redundancy or mirroring provided by the ASM instance. This is the ‘External’ option and assumes that you are handling mirroring somewhere else perhaps through hardware raid on your storage network. You can chose ‘normal’ 2 way mirroring r …
The process for modifying a votedisk that is stored on ASM differs from the process when the votedisk is stored on some other medium. When your voting disks are stored on ASM you can move them off to non ASM storage with the replace command: $ crsctl replace votedisk [path_to_new_votedisk] (this can be done from …
An ASM instance forms and presents is the underlying structure for an ASM dynamic volume. ASM provides a disk group which is really a logical container for physical space. ASM is very efficient at storing data files but there are many types of files that cannot be stored on ASM and it cannot be read …
An ASM instance has its own SGA but it is not the same as the SGA in a database instance. The 4 main sections of the SGA in an ASM instance are: ASM Cache – this is used during rebalancing operations for reding and writing blocks. Large Pool – Used for Parallel Operations. Shared Pool …
You cannot simply add more copies of voting disks to increase redundancy because the number of voting disks is managed by Oracle ASM and determined by the redundancy of the disk group. To increase the number of voting disks, you need to move them to a disk group with higher redundancy. So, create the new …
The ORA-15260 error when attempting ot issue an alter diskgroup command is a permissions issue. It will generally be because you are logged in as SYSDBA rather than SYSASM. Prior to 11gR2 you could log in and administer diskgroups with SYSDBA privileges but this changed with 11.2. SQL> ALTER DISKGROUP DATA add disk ‘/dev/oracleasm/disks/DISK2’;ALTER …
Firstly, you need to create files padded to the required disk size. So if you want 4 1Gb files you could execute the below commands on shared storage: dd if=/dev/zero of=/SHAREDDISK/asmDisk1-1 bs=1024k count=1000 dd if=/dev/zero of=/SHAREDDISK/asmDisk1-2 bs=1024k count=1000 dd if=/dev/zero of=/SHAREDDISK/asmDisk1-3 bs=1024k count=1000 dd if=/dev/zero of=/SHAREDDISK/asmDisk1-4 bs=1024k count=1000 dd creates your file, ‘if’=/dev/zero gets null …