Security Link SL150 Manual de usuario descargar pdf (Pagina 29)

Protecting Oracle Database Appliance - Tape Backup with Oracle Secure Backup

Recommended tuning by tape drive

In order to achieve optimal performance, tape settings in Oracle Secure Backup must be tuned for your

environment. Oracle Secure Backup tape drive tuning consists of modifying the block size that gets written to

tape, enabling direct I/O if running on Linux and enabling tape drive compression.

Set Blocking Factor and Max Blocking Factor

There are two settings available for block size setup in Oracle Secure Backup - Blocking Factor and Max Blocking

Factor. The best description of these settings is found in the Oracle Secure Backup Administrator's Guide:

"The block size of a block of data is the size of the block in bytes as it was written to tape. All blocks read or

written during a given backup or restore operation have the same block size. The blocking factor of a block of data

expresses the number of 512-byte records that are contained in that block. So, for example, the Oracle Secure

Backup default blocking factor (128) results in a tape block size of 128*512 bytes or 64KB. The maximum

blocking factor is an upper limit on the blocking factor that Oracle Secure Backup uses. This limit comes into play

particularly during restores, when Oracle Secure Backup must pick an initial block size to use without knowing the

actual block size on the tape. The maximum blocking factor limits this initial block size to a value that is acceptable

to both the tape device and the underlying operating system."

To configure block sizes, open the Oracle Secure Backup GUI and navigate to Configure->Defaults & Policies-

>Media. Modify the Blocking factor and Max blocking factor settings to adjust the block size written to tape.

This example uses a 1MB block size (Default block size of 128 512 byte records = 64K X 32 = 2048 for 1MB –

(see figure 22):

Figure 22: Oracle Secure Backup Media screen with block setting changes.

Direct I/O

On systems running Linux, Oracle Secure Backup is able to take advantage of Direct I/O to achieve faster backup

speeds. Direct I/O eliminates a memory copy of data going to a device such as a tape drive thereby increasing

performance. To enable Direct I/O execute the following commands as the root user:

1 2 ... 24 25 26 27 28 29 30 31

Sin comentarios

Security Link SL150 Manual de usuario Pagina 29