RAID Operations

We perform RAID sync operations during which we measure the time the NAS needs to complete these tasks. In NAS servers with four bays or more, we rebuild and sync RAID 1, RAID 5, and RAID 6 arrays, while in smaller two-bay NAS servers, we are confined to a RAID 1 array. The Bitmap option is disabled in NAS servers that support it to produce comparable results since it speeds up RAID rebuild times.

We didn't include any RAID rebuild results because there was no option to disable Bitmap, so the results wouldn't be comparable to the rest. We did notice that the rebuilding of a broken RAID 1 array with more than 100 GB of data was pretty fast, at least according to what the OS was reporting. The broken RAID 1 array was reported as "good" in less than two minutes! We are very skeptical of this result, though, since it is very hard for the HDDs we used to mirror their data across the array so quickly. The RAID rebuilding process was most likely still silently running in the background after the OS had reported the RAID 1 array as good. We also checked the system activity monitor, but couldn't find anything, which was weird.

RAID Sync Graphs