is the acronym for Self-Monitoring, Analysis and Reporting Technology, which is a monitoring system used to gauge drive reliability and provide information on the current status of the drives. attributes are examined by utilizing several parameters to see if the drive is starting to develop problems. The results can serve as an indicator of the remaining lifespan of a drive. Pay extra attention to the following three S.M.A.R.T. attributes 1 that are related to bad sectors: Reallocated Sector Count (ID 5), Reallocated Event Count (ID 196), and Current Pending Sector Count (ID 197). A bad sector is a cluster of unreadable data caused by wear and tear, over-heating, collision, file system error, etc. Upon detecting an impaired sector, it will be redirected to a reserved space – a spare sector. This reallocation process is called “remapping.” Note, though, that increasing remapping operations will slow down drive access and may spell the end of your drive. It is ideal to have a low value of the above attributes, as these values can be used as a benchmark to detect looming drive failures. Both Google ’s and our statistics show that these attributes are highly correlated to a higher chance of drive failure. Drives that have developed bad sectors are 10X more likely to result in failed drive access than those which don’t have any bad sectors. tests regularly, the other thing you can do on your Synology NAS is configuring notification event settings in “Internal Storage” under the Advanced tab in Control Panel. Select the seven events 2 in particular and take necessary action upon receiving a notification message triggered by them. Let’s get started with three common error terms: ICRC, IDNF, and UNC errors. An ICRC error is a communication problem occurring when data is transferred between the host and the hard drive, while an IDNF error occurs when the drive is unable to read data that is located at a corrupt sector. A UNC error implies that the data the hard drive attempts to read is damaged and cannot be corrected using ECC (Error correction code). The following are events 3 related to these errors:Ģ. Drive re-identification (IDNF error) alertģ. Alert of drive with read abnormality (UNC error) Drive reconnection alert when Synology NAS boots upĤ. When you receive a notification regarding any of these errors above, it could be an early warning sign of a failing drive. If the issue continues, it may suggest that the drive is not working properly. We strongly recommend that you back up your data and replace the current drive. Other than the above-mentioned alerts, there are three other events that you should pay attention to as well. Since accumulated bad sectors will gradually lead to data loss in the long term, you’ll receive a warning when the detected bad sectors are increasing. Bad sectors may also lead to drive I/O errors. However, your drive may be still working properly after several retries. If this error keeps occurring, please back up your data and examine the hard drive status by conducting a S.M.A.R.T. By the way, you can refer to the Synology Products Compatibility List to check the expected lifespan of your SDD. Consider replacing your drive with a healthy one when you receive a warning, as it could be a sign of impending drive failure. In general, it’s only a matter of time before a drive fails, but we can take simple yet important precautions against drive failures before they ultimately lead to data loss. Take preemptive action upon receiving hard drive alerts, for ignoring these warning signs may cost you big when disaster strikes. You can take a more proactive approach by performing diagnostic S.M.A.R.T. (Note: this is run from the root directory, so no need to change directories).Tests on a regular basis to gain insights into the current status of your drive. Then tail the following to confirm that the drive shows as healthy: e.g., if it's sata1 or sda (disk 1 in both cases) leave it as: (Note: after the first /dev/, specify the harddrive. If the failure persists, run the following, then confirm the test passes:ĭhm_tool -v 4 -d /dev/ -dhm -outputPath /var/log/healthtest/ > disk_ihm.verbose. Sudo cp -ra /var/log/healthtest /var/log/healthtest_old
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