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RAID reconstruction process

ZAR has been discontinued
After about twenty years, I felt ZAR can no longer be updated to match the modern requirements, and I decided to retire it.

ZAR is replaced by Klennet Recovery, my new general-purpose DIY data recovery software.

If you are looking specifically for recovery of image files (like JPEG, CR2, and NEF), take a look at Klennet Carver, a separate video and photo recovery software.
RAID recovery run

There are two panels on the program window - left and right. Left panel displays the map of the RAID disks; right panel allows you to adjust disk I/O settings as you go. For more information on the disk I/O, refer to runtime control functions.

The procedure is fully automated. Expect the following progress indications:

Preparing analysis
Early into the process, ZAR checks if it needs to reconstruct a missing RAID5 member disk and does some other RAID analysis.

Scanning RAID
During this stage all the array member disks are scanned and the fragments of the filesystem structures and data files identified. These fragments are then used to reconstruct the layout of the array.

RAID recovery time

The RAID recovery can be completed before the entire disk set is scanned. This depends on the amount and type of data stored on the disks and the filesystem type in use. In extremely short cases, the RAID recovery can be completed in less than a couple of minutes. This is the expected behavior.

Still, the worst case is having to scan the entire disk set. This may take up to about two hours per terabyte of disk space on the array including parity disk, if any.

Copyright © 2001 - 2023 Alexey V. Gubin.