Rebuilding RAID 6 takes a lot of time

We have a DL360 Gen10 with 5 SSD’s of 1.92Tb in RAID 6 configuration, running ESXi version 6.7.0-U3.
Last week we had a failed SSD in Bay 1 and replaced it with a new one.
After that we expected the system to rebuild the RAID 6, but in iLO 5 we see on the Volume a “LogicalDriveStatusReasons” which stands for “Recovering”. It is our production server and the performance is very slow, due the large amount of data and the rebuilding process. Who has the same experience and knows how long this process will take? Is this normal and expected, almost more than a week? Any suggestion of comment is more than welcome.

Tagged: RAID

NAS data recovery

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Jace Elric

Participant

June 17, 2025 at 10:24 am

Rebuilding RAID 6 on your HPE DL360 Gen10 with 5 SSDs can take a long time, especially while the server is in use. Even with SSDs, RAID 6 rebuilds involve heavy calculations and data movement, so it’s normal for the process to take several days or even more than a week.

The “Recovering” status you see in iLO means the rebuild is ongoing. Performance will be slower during this time, particularly if the rebuild priority is low or if the system is busy with other tasks.

To speed up the rebuild, check the RAID controller settings and increase the rebuild priority if possible. Reducing the server workload and making sure all firmware is up to date can also help. It’s also a good idea to check the health of the other drives.

Overall, long rebuild times and reduced performance are expected with RAID 6 under load. Keep monitoring the progress until the rebuild finishes.

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