The new option is broadly similar to the previous option but is enabled by default and is implemented such that, when un-checked, the same code as v6 is used to write image files.Īutomatically disable Changed Block Tracking on the backup target drive and selectively enable/disable CBT on any NTFS mounted drive using the Macrium Reflect UI. The 'Disable Direct Disk I/O' option is selected by default and replaces the previous option 'Enable file write caching.'. Take 'Other Tasks' > 'Edit Defaults' > 'Advanced' > 'Advanced Backup Options': We suggest that you try with this option selected/checked first. If the option is un-checked when you install the latest release then this is due to previous configurations made in v6. Please check your backup speeds after installing the latest release before un-checking this setting.
Note : Deselecting this option may also have an adverse effect on backup creation times and allow AV software to interfere with the backup process. When the target disk write speed is slower than the source read > compress cycle then any impact, no matter how small, on the backup target write speed will cause a slow down in image creation time. These three operations are performed asynchronously, so the backup speed is a function of the slowest of these operations. We now realise that our tests were conducted without the target disk being the bottleneck in the backup process (Read -> Compress -> Write). Incremental backup speed increased dramatically in some tests due to the effects of CBT and some Full backups were also slightly faster. Several customers have noticed an increase in backup creation times when saving to local disks How Image file write efficiency affects backup speed when the target disk write speed is the bottleneckĭuring the v7 development process we tested the impact of disabling direct disk I/O and Changed Block Tracking and discovered no detrimental impact in Full backup creation times over v6. Image and File and Folder file write efficiency To install this release take the 'Other Tasks' > 'Check for updates' menu option in Macrium Reflect. We apologise for any inconvenience caused by these problems. This release contains improvements and bug fixes for Macrium Reflect 7 to address customer concerns expressed in the support forum, and via direct support emails.
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