Security Link SL150 Manuel d'utilisateur télécharger pdf (Page 30)

Protecting Oracle Database Appliance - Tape Backup with Oracle Secure Backup

# echo 1 > /proc/scsi/sg/allow_dio

# touch /usr/local/oracle/backup/device/enable_dio

Note: The /proc/scsi/sg/allow_dio file does not survive reboots. Setup an /etc/rc#.d script to ensure it gets set

during boot.

Hardware Compression

By default most tape drives have compression enabled, and it is recommended to compress at the tape drive level.

You can experiment with compression using RMAN, but if you opt to enable compression at a different layer of

the backup architecture you must disable tape drive compression to avoid doubling compression, which can result

in larger backups and slower transfer rates.

The table below shows the transfer rates achieved in the test environments following tuning.

TABLE 2.PERFORMANCE STATISTICS ORACLE DATABASE

APPLIANCE V1 (TESTS RUN ON X4170 M2 MEDIA SERVER)

DRIVE

TYPE

BLOCKING

FACTOR

INTERFACE

AVERAGE BACKUP TRANSFER RATE PER TAPE DRIVE

WITH HARDWARE COMPRESSION

LTO5

2048

10GbE

268 MBs

LTO5

2048

GbE

55 MBs

TABLE 3.PERFORMANCE STATISTICS ORACLE DATABASE

APPLIANCE X3-2 (TESTS RUN ON X3-2 MEDIA SERVER)

DRIVE

TYPE

BLOCKING

FACTOR

INTERFACE

AVERAGE BACKUP TRANSFER RATE PER TAPE DRIVE

WITH HARDWARE COMPRESSION

LTO6

2048

10GbE

373 MBs

Note1: GbE not tested on Oracle Database Appliance X3-2 as it was verified on Oracle Database V1 that RMAN

can easily saturate a GbE connection.

Note2: The limiting factor on a GbE interface with this configuration is the interface, not the tape drives. Each

node can send up to 120Mbs per second through an interface (bond is active-passive), but the Master/Media can

only consume 120MBs total as that is the capacity of the interface. If active-active bonding is configured, and/or

more NICs or multiple Medias Servers are used, higher rates could be achieved, as the tape drives were not

saturated.

Note3: All tests were run using the Bare Metal configuration (vs. Virtualized). Additionally, on Oracle Database

Appliance X3-2 tests only one storage module was used.

Conclusion

In conclusion, Oracle StorageTek tape products offer cost effective data protection for the Oracle Database

Appliance and, when combined with Oracle Secure Backup, provide an end to end solution fully supported by one

vendor – Oracle.

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Security Link SL150 Manuel d'utilisateur Page 30

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