Operation Manual

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Enabling bitmap/ disabling bitmap
This function can reduce the rebuilding duration after a crash, or time length required to
remove/re-add a hard disk. This feature does not improve the disk read/write
performance and might even cause a small degradation in performance. However, if an
array has a bitmap, a hard disk can be removed and re-added, and only changes in
blocks need to be made since the removal (as recorded in the bitmap) can be re-synced.
Note: The bitmap support is only available for RAID 1, RAID 5, RAID 6 and RAID 10.
To enable a bitmap, select a RAID group and click “Manage” > “Enable Bitmap” and then
“OK”.