With the increase in speed of processors and memory the bottleneck during backups is now the hard drive. Because most applications rely on disk access these applications may show a noticeable performance degradation if being used during a backup.
Vista and Windows 7 has introduced the concept of background IO and this feature enables the backup to utilize that functionality.
The feature was tested using a disk benchmark program (PerformanceTest 7) while patching a 1GB PST file. First the disk was benchmarked with no activity, then during a normal backup and then during the backup running in background mode.
|Disk activity||Average Performance index||Notes|
|No backup (idle)||350|
|Patching||100||Normal backup mode|
|Updating cache||91||Normal backup mode|
|Updating cache||315||Background mode|
From the results you can see that normally disk performance would take a serious hit during the backup. However with the backup running in background mode there is almost no effect on other tasks because they get priority. In fact when normal tasks need the disk the backup basically stops until the disk is free again.
Old Article ID: 23
Posted: 22 Apr, 2010 by Marais D.