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CHAPTER 8 - LIBRARY TROUBLESHOOTING
P
ERFORMANCE
The storage management process involves many system components, from the files in
the file system on the host computer, through the backup server, and out to the
library, all managed by software running on an operating system. The storage
management process only runs as fast as the slowest component in the system.
Performance issues are solved by identifying and addressing performance limitations
in your system. See sections below for the following potential performance
limitations:
•
Average File Size below
•
File Storage System on the next page
•
Connection from the Backup/Archive Host Server to a Disk Array on the next page
•
Backup/Archive Server on the next page
•
Backup/Archive Software and Method on the next page
•
Connection from the Backup/Archive Host Server to a Disk Array on the next page
•
Media on page 223
Average File Size
The hard drive must seek to the position of a file before it can start reading. The more
time the disk drive spends seeking to files, the lower the performance. Therefore, if
the average file size is small, the read performance is lower.
To determine the average file size, divide the size of the backup by the number of
files.
If the average file size is small (64 KB or less), consider using a sequential, image, or
block backup method that backs up the whole hard drive or LUN image instead of
individual files. The trade off for using one of these methods is that you might only
be able to restore the entire image instead of individual files.
Note:
File fragmentation also causes excessive drive seeking, which lowers performance, so
ensure that files are regularly defragmented.
JANUARY 2023
P
ROBLEMS
221
SPECTRA STACK LIBRARY
USER GUIDE
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