Since the NFS client is kernel-based, the bugs in some kernel versions will make the NFS service unavailable. To enjoy a better experience, please use recommended kernel versions.
Known client issues
No response of the file system due to kernel network stack defects (priority: high)
For a system with a kernel version in the range of v2.6.32-696 to v2.6.32-696.10.1 (including v2.6.32-696, excluding v2.6.32-696.10.1), when the kernel requests to retry due to a busy NFS server, a kernel network stack defect may be triggered, resulting in no response to the operation.
If there is no response to the operation, restart the CVM instance. For more information, see RHEL6.9:NFSv4 TCP transport stuck in FIN_WAIT_2 forever. No response of the file system due to kernel defects (priority: high)
For a system with one of the following kernel versions, the NFS server failover mechanism may cause file opening, read, and write deadlocks in the NFS client, resulting in no response of the file system.
Redhat 6, CentOS 6 2.6.32-696.3.1.el6
All kernel versions earlier than Redhat 7 and CentOS 7 3.10.0-229.11.1.el7
For a system with one of the following kernel versions, if network reconnection occurs due to network partitioning or jitter, the NFS client may continue to have no response due to failure to handle error codes properly. The manifestation is as follows: The file system gives no response, and bad sequence-id error is repeatedly printed in the system message.
All kernel versions earlier than Redhat 6 and CentOS 6 2.6.32-696.16.1.el6
For an operating system with a kernel version of CentOS/RedHat 5.11.x, executing operations that require traversing a directory, such as the Is command and a command containing the wildcard character * or ?, will cause jams or no response due to kernel defects. In this case, please upgrade the kernel to avoid this issue in the future.
Failure to support the chown command and system call (priority: low)
A system with a v2.6.32 kernel does not support executing the chown command and system call in the NFS client.
Failure to terminate Is operations (priority: low)
For a system with a kernel version of v2.6.32-696.1.1.el6 or earlier, adding and deleting files or subdirectories are also performed while Is operations are in progress, making Is operations unable to end.
In this case, please upgrade the kernel to avoid this issue in the future.
For a system with a kernel version of v4.18.0-305.12.1, Is and other directory traverse operations cannot end. Please upgrade the kernel to v4.18.0-305.12.1 to fix the issue. For more information, see Linux Kernel Archives. Recommended NFS images
Linux images
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CentOS | CentOS-6.9-x86_64: v2.6.32-696.16.1.el6.x86_64 or later CentOS-6.10-x86_64: v2.6.32-754.17.1.el6.x86_64 or later CentOS-7.2-x86_64: v3.10.0-514.26.2.el7.x86_64 or later CentOS-7.3-x86_64: v3.10.0-514.26.2.el7.x86_64 or later CentOS-7.4-x86_64: v3.10.0-693.2.2.el7.x86_64 or later CentOS-7.5-x86_64: v3.10.0-862.14.4.el7.x86_64 or later CentOS-7.6-x86_64: v3.10.0-957.21.3.el7.x86_64 or later CentOS-7.7-x86_64: v3.10.0-1062.18.1.el7.x86_64 or later CentOS-8.-x86_64: 4.18.0-147.5.1.el8_1.x86_64 or later |
Tencent OS Linux | TencentOS Server 2.2 (Tkernel 3) TencentOS Server 2.4 (Tkernel 4) TencentOS Server 2.6 (Final) TencentOS Server 3.1 (Tkernel 4) |
Debian | Debian-9.6-amd64: v4.9.0-8-amd64 or later Debian-9.8-amd64: v4.9.0-8-amd64 or later Debian-9.10-amd64: 4.9.0-9-amd64 or later |
Ubuntu | Ubuntu-14.04-amd64: v4.4.0-93-generic or later Ubuntu-16.04-amd64: v4.4.0-151-generic or later Ubuntu-18.04-amd64: v4.15.0-52-generic or later Ubuntu-20.04-amd64: v5.4.0-31-generic or later |
OpenSuse | OpenSuse-42.3-x86_64: v4.4.90-28-default or later |
SUSE | Enterprise Server 12 SP2 x86_64: v4.4.74-92.35-default or later Enterprise Server 12 SP4 x86_64: v4.12.14-95.16-default or later |
CoreOS | CoreOS-1745.7.0_64: v4.19.56-coreos-r1 or later CoreOS-2023.4.0_64: v4.19.56-coreos-r1 or later |
Windows images
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Windows Server 2012 | Windows Server 2012 R2 Datacenter 64-bit Chinese Windows Server 2012 R2 Datacenter 64-bit English |
Windows Server 2016 | Windows Server 2016 DataCenter 64-bit Chinese Windows Server 2016 Datacenter 64-bit English |
Windows Server 2019 | Windows Server 2019 Datacenter 64-bit Chinese Windows Server 2019 IDC 64-bit English |