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Backup to ZFS Storage Appliance Best Practices for Exadata Database Machine

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Backup to ZFS Storage Appliance Best Practices
for Exadata Database Machine

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Backup to ZFS Storage Appliance Best Practices for Exadata Database Machine

  1. 1. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 2 Backup to ZFS Storage Appliance Best Practices for Exadata Database Machine Emre Baransel Principal Advanced Support Engineer
  2. 2. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Using ESBU Oracle Engineered Systems Backup Utility for Oracle ZFS Storage Appliance Which tasks are performed? 1. Oracle ZFS Storage Appliance configuration  storage administrator A project including NFS shares is configured in a user-selected storage pool. 2. Engineered System nodes configuration  system administrator The client NFS and Oracle Direct NFS (dNFS) are configured in this step. 3. RMAN run block script generation  database administrator RMAN scripts are generated in this step. 3 http://www.oracle.com/technetwork/server-storage/sun-unified-storage/downloads/zfssa-plugins-1489830.html
  3. 3. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Enable dNFS & configure oranfstab file • What is dNFS? • How to enable/disable dNFS? • How to configure oranfstab file? • How to understand if dNFS is enabled? • How to understand if dNFS is being used? • How to monitor dNFS performance? • What about fstab options? • What about filesystemio_options? 4 Instead of using the operating system kernel NFS client, you can configure Oracle Database to access NFS V3 servers directly using an Oracle Internal Direct NFS client, which is faster.
  4. 4. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Enable dNFS & configure oranfstab file • What is dNFS? • How to enable/disable dNFS? • How to configure oranfstab file? • How to understand if dNFS is enabled? • How to understand if dNFS is being used? • How to monitor dNFS performance? • What about fstab options? • What about filesystemio_options? 5 $ cd $ORACLE_HOME/rdbms/lib $ make -f ins_rdbms.mk dnfs_on $ make -f ins_rdbms.mk dnfs_off ! Requires database restart
  5. 5. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | • What is dNFS? • How to enable/disable dNFS? • How to configure oranfstab file? • How to understand if dNFS is enabled? • How to understand if dNFS is being used? • How to monitor dNFS performance? • What about fstab options? • What about filesystemio_options? server: zfsserver1  NFS server Host name (Alias) path: 10.177.52.158  First path to NFS server, NFS server NIC local: 10.177.52.151  First client-side NIC path: 10.177.52.159  Second path to NFS server, NFS server NIC local: 10.177.52.151  Second client-side NIC (For load balance purpose) export: /oraclenfs mount: /zfsbackup | |mount point on a database server |mount point on the NFS server Enable dNFS & configure oranfstab file 6 DNFS searches for mount entries in the following order: 1. $ORACLE_HOME/dbs/oranfstab 2. /etc/oranfstab 3. /etc/mtab
  6. 6. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | • What is dNFS? • How to enable/disable dNFS? • How to configure oranfstab file? • How to understand if dNFS is enabled? • How to understand if dNFS is being used? • How to monitor dNFS performance? • What about fstab options? • What about filesystemio_options? Reported in the alert.log: ... Oracle instance running with ODM: Oracle Direct NFS ODM Library Version 3.0 ... Direct NFS: channel id [0] path [celntap3-bc] to filer [celntap3-bc] via local [] is UP Direct NFS: channel id [1] path [celntap3-bc] to filer [celntap3-bc] via local [] is UP Enable dNFS & configure oranfstab file 7
  7. 7. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Enable dNFS & configure oranfstab file • What is dNFS? • How to enable/disable dNFS? • How to configure oranfstab file? • How to understand if dNFS is enabled? • How to understand if dNFS is being used? • How to monitor dNFS performance? • What about fstab options? • What about filesystemio_options? 8 - v$dnfs_servers - v$dnfs_files - v$dnfs_channels
  8. 8. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Enable dNFS & configure oranfstab file • What is dNFS? • How to enable/disable dNFS? • How to configure oranfstab file? • How to understand if dNFS is enabled? • How to understand if dNFS is being used? • How to monitor dNFS performance? • What about fstab options? • What about filesystemio_options? 9 - v$dnfs_stats NFS_READ: Read operations NFS_WRITE: Write operations - Performance Monitoring script here: Direct NFS monitoring and v$views (Doc ID 1495739.1) - OS utilities sar,nmon.. can be used to monitor network traffic
  9. 9. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Enable dNFS & configure oranfstab file • What is dNFS? • How to enable/disable dNFS? • How to configure oranfstab file? • How to understand if dNFS is enabled? • How to understand if dNFS is being used? • How to monitor dNFS performance? • What about fstab options? • What about filesystemio_options? 10 DNFS does not utilize NFS mount options. However setting the proper mount options is recommended to be in compliance with database requirements and to improve performance if DNFS is not operational and the system defaults to NFS. Oracle ZFS Storage: FAQ: Exadata RMAN Backup with The Oracle ZFS Storage Appliance (Doc ID 1354980.1) Sun ZFS Storage Appliance: Oracle Database 11g R2 NFS Mount Point Recommendations (Doc ID 1567137.1) Mount Options for Oracle files when used with NFS on NAS devices (Doc ID 359515.1)
  10. 10. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Enable dNFS & configure oranfstab file • What is dNFS? • How to enable/disable dNFS? • How to configure oranfstab file? • How to understand if dNFS is enabled? • How to understand if dNFS is being used? • How to monitor dNFS performance? • What about fstab options? • What about filesystemio_options? 11 Direct NFS does not depend on the value of filesystemio_options. Direct NFS always issues async and direct I/O as it does not depend on OS support. However, since we can always fall back to the OS NFS client in case of mis-configuration, as a precaution, set filesystemio_options to 'directio' or 'setall' if the OS supports it.
  11. 11. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Increase MTU size • To avoid backup performance regression, the MTU size should be set to 65520. • Backup/restore performance and stability will be higher on the higher MTU settings. • The MTU size reduction should be utilized if page allocation failure events have been experienced 12 Exadata version Recommended Permitted < 11.2.3.3.0 or >= 12.1.2.1.0 65520 7000,15000,31000,64000 >= 11.2.3.3.0 and < 12.1.2.1.0 7000 15000,31000,64000,65520
  12. 12. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Configure Projects To Use a Write Bias of “Throughput” Synchronous writes are optimized for throughput. Data is written to the primary data disks instead of the log device(s), and the writes are performed in a way that optimizes for total bandwidth of the system. 13
  13. 13. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Increase "Database record size" • 2013.1.1 or later code levels are required to use large 1MB record sizes. • If the ZFS Storage Appliance is running earlier code, 128K record size is the largest available option. 14
  14. 14. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Backup Compression • Attempting to compress data that doesn’t typically yield good compression results lengthens the backup window significantly, consumes unnecessary CPU resources, and results in very little space savings. 15 Backup Type Duration Compression Ratio nocompress 3 min. - ZFS LZJB compression 2 min. 58% compression ZFS GZIP compression 16 min. 75% compression RMAN compression 16 min. 75% compression A recent tablespace backup test results of Exa-ZFS configuration.
  15. 15. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Keep some free space • The recommendation from Oracle Exadata MAA and Sun ZFS Storage Appliance development team is to keep 20% free space on each disk pool created, allowing the copy and write operations to run optimally. If the free space is allowed to reduce past the 20% recommendation, then write operations to the Sun ZFS Storage Appliance might be impacted because the appliance will be forced to spend more time looking for free space. 16
  16. 16. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ZFS-Exadata Configuration References • Oracle ZFS Storage: FAQ: Exadata RMAN Backup with The Oracle ZFS Storage Appliance (Doc ID 1354980.1) • Backup and Recovery Performance and Best Practices using Oracle Sun ZFS Storage Appliance and Oracle Exadata Database Machine http://www.oracle.com/technetwork/database/features/availability/maa-wp-dbm-zfs-backup-1593252.pdf • "Oracle Engineered Systems Backup Utility for Oracle ZFS Storage Appliance" tool http://www.oracle.com/technetwork/server-storage/sun-unified-storage/downloads/zfssa-plugins-1489830.html 17

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