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Important QTS Update for Potential Silent Data Corruption on NAS Using RAID 5/6
The following models are NOT affected by this issue.

1-bay:
- TAS-168
- TS-109 / TS-109 Pro / TS-109 II / TS-109 Pro II
- TS-110
- TS-112 / TS-112P
- TS-119 / TS-119P+ / TS-119P II
- TS-120
- TS-121
- TS-128
- TS-131

2-bay:
- HS-210
- TAS-268
- TS-209 / TS-209 Pro / TS-209 Pro II / TS-209 II
- TS-210
- TS-212 / TS-212P / TS-212E
- TS-219 / TS-219P / TS-219P+ / TS-219P II
- TS-220
- TS-221
- TS-228
- TS-231
- TS-239H / TS-269H
- TS-239 Pro / TS-239 Pro II / TS-239 Pro II+
- TS-259 Pro / TS-259 Pro+
- TS-269 Pro / TS-269L

4-bay:
- SS-439 Pro
- TS-409 / TS-409 Pro / TS-409U
- TS-410 / TS-410U
- TS-412 / TS-412U
- TS-419P / TS-419P+ / TS-419P II / TS-419U / TS-419U+ / TS-419U II
- TS-420 / TS-420-D / TS-420U
- TS-421 / TS-421U
- TS-431 / TS-431U
- TS-439 Pro / TS-439 Pro II / TS-439 Pro II+ / TS-439U-RP/SP
- TS-459 Pro / TS-459 Pro+ / TS-459 Pro II / TS-459U-RP/SP / TS-459U-RP+/SP+
- TS-469 Pro / TS-469L / TS-469U-RP / TS-469U-SP

5-bay:
- TS-509 Pro
- TS-559 Pro / TS-559 Pro+ / TS-559 Pro II
- TS-569 Pro / TS-569L

6-bay:
- TS-639 Pro
- TS-659 Pro / TS-659 Pro+ / TS-659 Pro II
- TS-669 Pro / TS-669L

8-bay:
- SS-839 Pro
- TS-809 Pro / TS-809U-RP
- TS-859 Pro / TS-859 Pro+ / TS-859U-RP / TS-859U-RP+
- TS-869 Pro / TS-869L / TS-869U-RP

12-bay:
- TS-1269U-RP

Q1: How can I quickly check if my NAS is affected by the silent data corruption issue?
A1: Your NAS is not affected if its model number is listed above.

Q2: What should I do if my NAS model is not in the list?
A2: Refer to the recommended solution in the following technical advisory:
https://www.qnap.com/en/technical-advisory/tec-201707-01

Q3: Why can't I find the RAID scrubbing feature?
A3: The NAS does not support RAID scrubbing if at least one of the following conditions is true.

  1. The model is listed above.
  2. The model does not support upgrading to QTS 4.3.3.
  3. The Storage Manager screen looks like the examples below.
    Important: If your NAS does not support RAID scrubbing, it is not affected by the issue.

Q4: Why is RAID scrubbing disabled on my NAS?
A4: This is a known issue that will be resolved in the next QTS release. You can perform one of the following workarounds.

  1. Schedule data scrubbing on Storage Manager (Global Settings > Data Scrubbing).
  2. Log on to the command line and then perform the following steps.
a. Check the multiple device (md) driver of your RAID 5 or RAID 6 using the following command:
[~] # cat /proc/mdstat

In the following example, the md driver of RAID 5 is “md1”.

b. Start RAID scrubbing using the following command:

[~] # echo repair > /sys/block/md1/md/sync_action

You can monitor the RAID scrubbing progress in the Background Tasks section of the QTS task bar.

Q5: How can I schedule RAID scrubbing?
A5: Go to Storage Manager > Global Settings > Data Scrubbing and then click Edit to create a schedule.

Q6: How often should I perform RAID scrubbing?
A6: QNAP recommends performing RAID scrubbing every month.

Q7: Can I stop RAID scrubbing?
A7: The current user interface does not allow you to stop RAID scrubbing once started. To stop the process, log on to the command line and then perform the following steps.

a. Check the multiple device (md) driver of your RAID 5 or RAID 6 using the following command.

[~] # cat /proc/mdstat

In the following example, the md driver of RAID 5 is “md1”.

b. Stop RAID scrubbing using the following command:

[~] # echo idle > /sys/block/md1/md/sync_action

Q8:  What will happen if I restart the NAS while RAID scrubbing is in progress?
A8: RAID scrubbing will stop and you will need to restart the process.

Q9:  Is the silent data corruption related to how I use the NAS or the types of hard disk that I install?
A9: Silent data corruption refers to unintentional changes to data resulting from errors that are undetected by the operating system. NAS usage and installed disks are often not related to the issue. However, using an affected NAS for database and virtualization purposes increases the risk of silent data corruption occurring. Also, disk firmware issues and disk failures are generally known to cause data corruption.

Release date: 2017-07-28
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