Oracle Cloud Storage and File system

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o rp o ra tion

Oracle Cloud

Storage and File

system

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Few notes about me

•I

• Am a DBA • Work in Tieto

• Have 4 years exprerience working with Oracle products • Am 10g/11g OCP certified

• Am mainly working with Oracle Apps

• Sometimes blog at: adbaday.wordpress.com

• More often tweet as @akarpov_ • [email protected]

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Agenda

• Cloud Storage

• Cloud file system (focus) • Features

• Benefits • Use cases • Demos

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Questions

• Who has heard of Oracle Cloud Storage? • Who has heard of ACFS?

• Who uses ACFS?

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Oracle Cloud Storage

• Big movement in IT towards Consolidation, Grid and Cloud Computing 

• ASM appeared in 10gR1

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Cloud Storage - architecture

• Picture with all components

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ASM Cluster File System (AFCS)

• Introduced in Grid Infrastructure 11gR2 • Built from the traditional ASM disk groups • General purpose file system

• Uses standard file related system calls like others file systems in the market

• Requires ASM Dynamic volume

• Disk creation for ACFS is performed with a typical workflow process

• Supported on RH/EL 5.x ACFS Supported On OS Platforms. [ID 1369107.1]

• In January 2011 ACFS has been rebranded to Oracle Cloud file system

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ASM Dynamic Volumes

• Similar as other logical volumes (for example, LVD in Linux) • All volume IO is processed through the ADVM driver

• Special file type asmvol used for creating ADVM Dynamic volumes

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ASM Dynamic Volume manager (ADVM)

• Designed for cluster and single host volumes

• Loadable kernel driver

• ASM features

• Dynamic storage provisioning

• Cross platform (Linux, Windows, Unix)

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Overview

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ACFS deployment

• Two types of ACFS file systems:

• CRS Managed ACFS (for example, ORACLE_HOME) • General Purpose ACFS

• No structural differences

• Does not support Oracle Database files (controlfiles, datafiles, online redo logs, etc.)

• Does not support grid home installation

• From 11.2.0.3 supports RMAN backups (backupsets), archivelogs and Data Pump dumpsets

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ACFS Mount registry

• Persistent entry for each GP ACFS file system after reboot • Similar to /etc/fstab on Linux

• Not needed for CRS Managed ACFS file systems • Need for mounting GP FS during node startup

• /sbin/acfsutil registry -a -f -n ol58-1123-rac1 /dev/asm/u02-361 /u02

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Manage ACFS

• Online resize - be careful!

• There is a limit of 5 extents for the file system's internal storage bitmap. This causes any attempts to increase the file system to fail after it has been increased four or more times.

• Solution - /sbin/fsck -a -v -y -t acfs /dev/asm/acfs-368

• Decrease FS and increase again with increase size > descrease size

• Mount / umount (also via NFS protocol) • Register

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ACFS Snapshots

• Read / write snapshots from 11.2.0.3

• First Copy-on-Write (FCOW) methodology • Available under .ACFS

• Accessing the snapshot will always provide a point-in-time view of a file

• ACFS snapshots can be very useful for file-based recovery or for filesystem backups

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ACFS Replication

• Enabled replication of ACFS file systems across the network to a remote site

• Replication logs are used to replicate from primary to standby asynchronously

• Data Guard for FS => Complete DR solution

• Supports ACFS Tagging

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ACFS Tagging

• Common naming attribute to a group of files • Select files with tag for replication

• Avoid entire file system replication

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Limits

• 63 snapshots

• Up to 64 mounts on 32 bit systems, and 256 mounts on 64 bit systems

• Do not use ACFS to store database files

• Do not use ADVM volume devices for bootstrap or root filesystem

• Do not partition (fdisk) ADVM volume devices

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Benefits

• One software for everything • Dynamic management

• No need to separate storage administrators and ASM administrators

• Mount it anywhere with NFS • Features

• Performance

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Oracle Apps considerations

• eBusiness Suite application stack on ACFS

• Not specially certified • Not Unsupported

• Ideal for placing shared log files, output files, etc

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Licencing

• Comes free out-of-the box with Grid Infrastructure installation

• Unless you want to store your personal files on ACFS • No limitations in feature usage

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Q & A

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