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Mouhamadou Diaw

Migrating from ASMLIB to ASMFD

By | Database Administration & Monitoring | No Comments

Before Oracle 12.1 the methods used to configure ASM were • udev • asmlib Oracle 12.1 comes with a new method called Oracle ASM Filter Driver (Oracle ASMFD). In Oracle documentation we can find following: Oracle ASM Filter Driver (Oracle ASMFD) is a kernel module that resides in the I/O path of the Oracle ASM disks. Oracle ASM uses the filter driver to validate write I/O requests to Oracle ASM disks. The Oracle ASMFD simplifies…

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Daniel Westermann

udev rules for ASM devices on RHEL 7

By | Database Administration & Monitoring | 2 Comments

Preparing the storage devices for use with ASM is one of the first tasks you should do. When you do not want to use ASMLib then udev is what you should use for this. As the order/naming of the devices in the device tree is not guaranteed (e.g. dm-1 is not guaranteed to be the same device after a reboot of the system) you need a way to fix this and that is what udev…

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Oracle Team

ASM iostats

By | Database Administration & Monitoring | One Comment

By Franck Pachot . A few screenshots and a link here. Sysadmins do not like ASM because they don’t have the tools they like to manage the disks. For example, they don’t want to run SQL queries to check performance, and asmcmd iostat is quite limited. Here is a nice way to get I/O statistics easily from command line.

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Oracle Team

Where is the ASM SPFILE?

By | Database Administration & Monitoring | No Comments

By Franck Pachot . In the previous blog post, to the question “where is the ASM SPFILE” I answered by running ‘asmcmd spget’. But this is available only if the ASM instance is started. If you have corrupted your SPFILE (and it’s easy to do it) you can start with a local PFILE and the CREATE SPFILE= FROM PFILE. But then you get the location of the local one you used. If you need to…

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Oracle Team

Extended clusters and asm_preferred_read_failure_groups

By | Database Administration & Monitoring | One Comment

By Franck Pachot . When you have 2 sites that are not too far you can build an extended cluster. You have one node on each site. And you can also use ASM normal redundancy to store data on each site (each diskgroup has a failure group for each site). Writes are multiplexed, so the latency between the two sites increases the write time. By default, reads can be done from one or the other…

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Daniel Westermann

Upgrading the Grid Infrastructure from 12.1.0.1 to 12.1.0.2 on the command line

By | Database Administration & Monitoring | 2 Comments

A lot of people use the graphical way to upgrade Oracle software from one version to another. While there is nothing to say against that the same can be done without any graphical tools. This post outlines the steps to do so. Currently my cluster is running Grid Infrastructure 12.1.0.1 without any PSU applied. The node names are racp1vm1 and racp2vm2: [grid@racp1vm2 ~]$ /u01/app/12.1.0/grid_1_0/bin/crsctl query crs softwareversion Oracle Clusterware version on node [racp1vm2] is [12.1.0.1.0]…

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David Hueber

ODA – VMs possibilities & performances

By | Hardware & Storage | No Comments

As you know it is possible to install the ODA in a virtualized mode and to take avantages from all cores not licensed with Enterprise Edition for additional VMs. The question is what could we do with it and which performances could we expect… The answer to the first question is indeed pretty simple….almost everything. If you have and ODA X5-2 with the version 12.1.2.3.0 implemented in virtualized mode then you are running an OVM…

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Oracle Team

Oracle Database 12c: ACFS – un système de fichier pour vos bases

By | Technology Survey | One Comment

La version 12c d’Oracle Grid Infrastructure introduit de nombreuses nouveautés dans le support d’ACFS, le système de fichiers clusterisés d’Oracle. Nous abordons dans ce posting la capacité d’ACFS d’être le système de fichier de votre base de données ainsi que sa capacité de mise en œuvre des snapshots. Rappel sur ACFS Ce système de fichier est apparu avec la version 11.2 du cluster Oracle. Il s’appuie sur ASM ainsi qu’ADVM pour ASM Dynamic Volume Manager. Il est…

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