User Guide

23
Chapter 4 - Installation Notes
In this section
• General Installation Notes
• NetWare Installation Notes
• Error! Reference source not found.
• Linux/UNIX Installation Notes
General Installation Notes
Device Buffer Sizes
To maintain optimal performance, Yosemite Backup sets a default buffer size that is allocated evenly
between each device attached to your computer. For example, if two devices are attached to your
computer, the buffer size is 32MB and the available free memory is 32MB or more, Yosemite Backup
allocates 16MB to each device.
The default (recommended) device buffer size is 25% of physical memory. If this amount is 32MB or
more, Yosemite Backup sets the buffer size to 32MB. If the 25% is not exactly equal to 16MB, 8MB,
4MB, 2MB or 1MB, Yosemite Backup sets the buffer size to the next lower setting.
For example, if 96MB is installed, 25% is 24MB. As a result, Yosemite Backup sets the buffer size to the
next lowest setting (16MB).
Setting this value higher can enhance performance, especially if more than two devices are attached to
your system. Yosemite Backup can buffer more data in memory by reading larger amounts of data from
the disk at a time. However, do not set the buffer size to exceed available system memory or your
performance will decrease due to excessive disk operations.
To change the device buffer size
1. Start Yosemite Backup and open the Device view.
2. Select the device whose buffer size you want to change.
3. Open the Configuration property page and select a new buffer size in the I/O buffer size field.
Buffer sizes can be set between 512 KB and 256 MB.
4. You can also change the default block size.
Block sizes can be set between 512 bytes and 64 KB.
5. Click Apply or OK to save your changes.