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http://www.remote-dba.net/t_rac_asm_asmlib.htm
/dev/path - A block device to query for the presence of an ASM label. Figure 3.3: Querying Disks with Oracleasm. If the queried device is not an ASM disk, then FAILED will be displayed between the brackets. In a RAC configuration, all nodes must be able to see the same ASM devices.
https://docs.oracle.com/en/database/oracle/oracle-database/18/ostmg/administer-filter-driver.html
See Also: My Oracle Support articles about Oracle ASMFD available at My Oracle Support (https://support.oracle.com) for additional information about Oracle ASMFD, such as supported operating system platforms (certification matrix) or configuration issues.. ASMCMD Oracle ASM Filter Driver Management Commands for information about the ASMCMD commands for administering …
https://www.thegeekdiary.com/oracle-asm-shell-script-to-map-physical-disk-devices-to-asmlib-disks/
Finding asmlib disk name and asm disk name. By default when you scan disks with oracleasm scandisks, the corresponding disk device files (ASMLIB disk names) are stored into the path /dev/oracleasm/disks. For example :
https://docs.oracle.com/database/121/OSTMG/GUID-DA8FBBB8-9831-44D1-AA41-5890B829CAEE.htm
Multipathing also improves system performance by distributing the I/O load across all available paths, providing a higher level of data availability through automatic failover and failback. Although Oracle ASM is not designed with multipathing functionality, Oracle ASM does operate with multipathing technologies.
https://docs.oracle.com/cd/E18248_01/doc/install.112/e16763/oraclerestart.htm
With Oracle Database 11 g Release 2 (11.2), Oracle ASM is part of an Oracle Grid Infrastructure installation, either for a cluster, or for a standalone server. If you want to upgrade an existing Oracle ASM installation, then you must upgrade Oracle ASM by running an Oracle Grid Infrastructure upgrade (upgrades of existing Oracle ASM installations).
https://www.red-gate.com/simple-talk/sql/oracle/oracle-automatic-storage-management-filter-driver-oracle-asmfd/
May 22, 2015 · Oracle ASMFD is a kernel module that resides in the I/O path of the Oracle ASM disks. ASMFD uses the filter driver to validate write I/O requests to Oracle ASM disks. Any write I/O requests that are not issued by Oracle software (e.g. using dd command) are not committed to ASM disks.4/4(4)
https://community.oracle.com/thread/3963796
Sep 27, 2016 · The steps look good for me assuming you have set asm scan boot to yes to scan disks every time when you boot the system. You can verify the setting in the /etc/sysconfig/oracleasm file . One more thing to look is to verify the ASMlib is coming after iscsi and have the devices attached to the system. Cheers, Gleb
https://www.oracle.com/technetwork/server-storage/linux/multipath-097959.html
ASMLib is a support library for the Automatic Storage ... but it is not an ASM disk. The single path disks /dev/sdb and ... are ASM disks, but ASMLib will see that it already has a path to that disk. It will ignore them. Finally, ASMLib will scan any other disks that did not match either prefix. ...
https://docs.oracle.com/cd/E80920_01/SAGUG/exadata-administering-asm.htm
When a failure group is not specified, Oracle ASM adds each disk within its own failure group. However, when the disks are stored on Oracle Exadata Storage Server s and a failure group is not specified, Oracle ASM adds a disk to the failure group for that cell. The failure group name is the cell name.
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