Applicable models:
All TNAS models
Applicable TOS versions:
TOS 5.1 or TOS 6.0
Fault Phenomenon:
After logging into the TOS system, there is a noticeable lag, and the system responds slowly. The TOS desktop dashboard shows that the system is experiencing a load bottleneck, yet both CPU and memory usage are within normal levels. Additionally, no processes with abnormally high resource consumption are found in Control Panel > System Information > Processes.
Cause of the Issue:
High system load may lead to performance bottlenecks, with the main causes related to the following key metrics: CPU usage, memory usage, network I/O, disk I/O, and disk performance. Any abnormality in these metrics can potentially cause the system to become blocked.
Problem Diagonsis and Solutions:
When both CPU and memory usage in TOS are within normal ranges, the issue can be diagnosed by checking the following aspects.
1、Check the disk I/O usage: Go to TOS Control Panel >> System Information >> Resource Monitor >> Disk I/O. To check disk I/O, perform read/write operations on the disk (e.g., copy files from a PC to the NAS via SMB protocol). The I/O speed of a regular HDD is 150-280MB/s, SATA SSD I/O speed is 550MB/s, and NVMe SSD I/O speed is 3500MB/s.
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2、Run a disk performance test to check the health of the disk, go to TOS Control Panel >> Storage Management >> Disks >> More >> Performance Test to check the values of IOPS, throughput, and latency, and verify if they are within normal ranges (you can refer to the data provided by the hard drive manufacturer for these metrics).
![Image]()
3、Check the network I/O usage, go to TOS Control Panel >> System Information >> Resource Monitor >> Network I/O. To monitor the upload and download speeds, perform operations on the network interface (such as copying files from a PC to the NAS via SMB protocol).
![Image]()
4、If the cause of the system bottleneck cannot be determined after all the above troubleshooting steps, please contact our customer service department to schedule a remote diagnosis and analysis with a technical engineer.
All TNAS models
Applicable TOS versions:
TOS 5.1 or TOS 6.0
Fault Phenomenon:
After logging into the TOS system, there is a noticeable lag, and the system responds slowly. The TOS desktop dashboard shows that the system is experiencing a load bottleneck, yet both CPU and memory usage are within normal levels. Additionally, no processes with abnormally high resource consumption are found in Control Panel > System Information > Processes.
Cause of the Issue:
High system load may lead to performance bottlenecks, with the main causes related to the following key metrics: CPU usage, memory usage, network I/O, disk I/O, and disk performance. Any abnormality in these metrics can potentially cause the system to become blocked.
Problem Diagonsis and Solutions:
When both CPU and memory usage in TOS are within normal ranges, the issue can be diagnosed by checking the following aspects.
1、Check the disk I/O usage: Go to TOS Control Panel >> System Information >> Resource Monitor >> Disk I/O. To check disk I/O, perform read/write operations on the disk (e.g., copy files from a PC to the NAS via SMB protocol). The I/O speed of a regular HDD is 150-280MB/s, SATA SSD I/O speed is 550MB/s, and NVMe SSD I/O speed is 3500MB/s.
2、Run a disk performance test to check the health of the disk, go to TOS Control Panel >> Storage Management >> Disks >> More >> Performance Test to check the values of IOPS, throughput, and latency, and verify if they are within normal ranges (you can refer to the data provided by the hard drive manufacturer for these metrics).
3、Check the network I/O usage, go to TOS Control Panel >> System Information >> Resource Monitor >> Network I/O. To monitor the upload and download speeds, perform operations on the network interface (such as copying files from a PC to the NAS via SMB protocol).
4、If the cause of the system bottleneck cannot be determined after all the above troubleshooting steps, please contact our customer service department to schedule a remote diagnosis and analysis with a technical engineer.
Statistics: Posted by TMzethar — Today, 16:43