Important QTS Update for Potential Data Corruption on NAS Using RAID 5/6
Release date: July 25, 2017
Severity: Critical
Scope
The following models are NOT affected:
TS-409, TS-409U, TS-509, TS-809, TS-809 Pro, TS-809U, TS-x10, TS-x10U, HS-210, HS-210-D, HS-210-X, TS-x12, TS-x12E, TS-x12P, TS-x12U, TS-x19P, TS-x19P+, TS-x19PII, TS-x19U, TS-x20, TS-x20D, TS-x20U, TS-x21, TS-x21U, TS-x28, TAS-x28, TS-x30, TS-x31, TS-x39, TS-x39U, TS-x39 Pro, TS-x39 Pro II, TS-x39 Pro II+, TS-239H, SS-x39, TS-x59, TS-x59U, TAS-x68, TS-x69, TS-x69L, TS-x69U, TS-x69 Pro, TS-269H
If your model is not in the list, please answer the following questions.
| Question |
Answer |
| Yes |
No |
| Are you using RAID 5 or RAID 6? |
Proceed to the next question. |
Your NAS is not affected. |
Have you ever installed any of the following builds?
- 4.2.x: Builds released between versions 4.2.0 and 4.2.6
- 4.3.x: Builds released before version 4.3.3.0238 build 20170703
|
Follow the recommended solution. |
Your NAS is not affected. |
Summary
A RAID 5 and RAID 6 algorithm issue that was reported by IT expert Wayne Small has been resolved in QTS builds released after April 17, 2017. Silent data corruption might have occurred on NAS devices with affected QTS builds and RAID 5 or RAID 6 configurations. The latest QTS builds already address this issue and users can recover corrupted data by installing a recent build and then enabling RAID scrubbing. However, RAID scrubbing cannot recover corrupted data if the RAID is degraded.
Solution
QNAP recommends installing any of the following QTS builds:
-
QTS 4.3.3.0238 Build 20170703
-
QTS 4.2.6 Build 20170628 (only for NAS devices that do not support 4.3.x)
After installing the update, you must also enable RAID scrubbing in order to detect and repair silent data corruption. When RAID scrubbing is enabled, QTS automatically verifies all parity blocks and fixes all mismatched parities to ensure data integrity.
Important: Your NAS usage and RAID capacity greatly affects the RAID scrubbing completion time. It may take any time from several hours to several days, depending on how often the NAS is accessed and on the NAS capacity. QNAP recommends minimizing NAS access while RAID scrubbing is in progress.
Please contact QNAP Support at
scrubbing_support@qnap.com if you have any further questions.
Installing the Update
-
Log on to QTS as administrator.
-
Go to Control Panel> System> Firmware Update.
-
Under Live Update, click Check for Update.
-
QTS downloads and installs the latest available update.
Tip: You can also download the build from the QNAP website. Go to Support> Download and then perform a manual update.
Enabling RAID Scrubbing
- Log on to QTS as administrator.
- Go to "Storage Manager"> "Global Setting".
- Select the storage pool or volume that contains the RAID 5 or RAID 6 group and then click "Manage".
- Select the RAID group, click "Manage", and then select "RAID Scrubbing".
QTS starts the RAID scrubbing process. To check the progress, go to Control Panel> System> System Logs, or click Background Tasks from the QTS task bar.
Tip: To schedule RAID scrubbing, go to Global Settings> RAID Scrubbing and then click Edit.
