Installation Related Issues
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Issue |
Cause |
Solution |
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Driver installation fails. |
The install script may fail for the following reasons:
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After driver installation, the openibd service fail to start. This message is logged by the driver: Unknown symbol |
The driver was installed on top of an existing In-box driver. |
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This section is relevant for RedHat and SLES distributions only.
Overview
MLNX_OFED package for RedHat comes with RPMs that support KMP (weak-modules), meaning that when a new errata kernel is installed, compatibility links will be created under the weak-updates directory for the new kernel. Those links allow using the existing MLNX_OFED kernel modules without the need for recompilation. However, at times, the ABI of the new kernel may not be compatible with the MLNX_OFED modules, which will prevent loading them. In this case, the MLNX_OFED modules must be rebuilt against the new kernel.
Detecting ABI Incompatibility with MLNX_OFED Modules
When MLNX_OFED modules are not compatible with a new kernel from a new OS or errata kernel, no links will be created under the weak-updates directory for the new kernel, causing the driver load to fail. Checking for the existence of needed module links under weak-updates directory can be done by reloading the MLNX_OFED modules. If one or more modules are missing, the driver reload will fail with an error message.
Example:
********************************************************************************
# /etc/init.d/openibd restart
Unloading HCA driver: [ OK ]
Loading HCA driver and Access Layer: [ OK ]
Module rdma_cm belong to kernel which is not a part of MLNX[FAILED]kipping...
Loading rdma_ucm [FAILED]
********************************************************************************
Resolving ABI Incompatibility with MLNX_OFED Modules
In order to fix ABI incompatibility with MLNX_OFED modules, the modules should be recompiled against the new kernel, using the mlnx_add_kernel_support.sh script, available in MLNX_OFED installation image.
There are two ways to recompile the MLNX_OFED modules:
Local recompilation and installation on one server.
Run the mlnxofedinstall command to recompile the kernel modules and reinstall the whole MLNX_OFED on the server. Mount MLNX_OFED ISO image or extract the TGZ file:
# cd <MLNX_OFED dir> # ./mlnxofedinstall --skip-distro-check --add-kernel-support --kmp --force
Notes:
- The --kmp flag will enable rebuilding RPMs with KMP (weak-updates) support for the new kernel. Therefore, in the next OS/kernel update, the same modules can be used with the new kernel (assuming that the ABI compatibility was not broken again).
- The command above will rebuild only the kernel RPMs (using mlnx_add_kernel_support.sh), and will save the resulting MLNX_OFED package under /tmp and start installing it automatically. This package can be used for installation on other servers using regular mlnxofedinstall command or yum.
Preparing a new image on one server and deploying it on the cluster.
Use the mlnx_add_kernel_support.sh script directly only to rebuild the kernel RPMs (without running any installations) on one server. Mount MLNX_OFED ISO image or extract the TGZ file:
# cd <MLNX_OFED dir> # ./mlnx_add_kernel_support.sh -m $PWD --kmp -y
Note: This command will save the resulting MLNX_OFED package under /tmp.
Example:
******************************************************************************** # cd /tmp/MLNX_OFED_LINUX-
3.3-1.0.0.0-DB-rhel7.0-x86_64 # ./mlnx_add_kernel_support.sh -m $PWD --kmp -y Note: This program will create MLNX_OFED_LINUX TGZforrhel7.1under /tmp directory. See log file /tmp/mlnx_ofed_iso.23852.log Building OFED RPMS . Please wait... Creating metadata-rpmsfor3.10.0-229.14.1.el7.x86_64 ... WARNING: Please note thatthisMLNX_OFED repository contains an unsigned rpms, WARNING: therefore, you should set'gpgcheck=0'in the repo conf file. Created /tmp/MLNX_OFED_LINUX-3.3-1.0.0.0-rhel7.1-x86_64-ext.tgz ********************************************************************************Install the newly created MLNX_OFED package on the cluster:
Option 1: Copy the package to the servers and install it using the mlnxofedinstall script.
Option 2: Deploy the MLNX_OFED package using YUM (for YUM installation instructions, refer to Installing MLNX_OFED Using YUM section):
i. Extract the resulting MLNX_OFED image and copy it to a shared NFS location.
ii. Create a YUM repository configuration.
iii. Install the new MLNX_OFED kernel RPMs on the servers: # yum update Example:
******************************************************************************** ... ... ======================================================================================================================== Package Arch Version Repository Size ======================================================================================================================== Updating: epel-release noarch
7-7epel14k kmod-iser x86_641.8.0-OFED.3.3.1.0.0.1.gf583963.201606210906.rhel7u1 mlnx_ofed35k kmod-isert x86_641.0-OFED.3.3.1.0.0.1.gf583963.201606210906.rhel7u1 mlnx_ofed32k kmod-kernel-mft-mlnx x86_644.4.0-1.201606210906.rhel7u1 mlnx_ofed10k kmod-knem-mlnx x86_641.1.2.90mlnx1-OFED.3.3.0.0.1.0.3.1.ga04469b.201606210906.rhel7u1 mlnx_ofed22k kmod-mlnx-ofa_kernel x86_643.3-OFED.3.3.1.0.0.1.gf583963.201606210906.rhel7u1 mlnx_ofed1.4M kmod-srp x86_641.6.0-OFED.3.3.1.0.0.1.gf583963.201606210906.rhel7u1 mlnx_ofed39k Transaction Summary ======================================================================================================================== Upgrade7Packages ... ... ********************************************************************************Note: The MLNX_OFED user-space packages will not change; only the kernel RPMs will be updated. However, “YUM update” can also update other inbox packages (not related to OFED). In order to install the MLNX_OFED kernel RPMs only, make sure to run:
# yum install mlnx-ofed-kernel-only
Note: mlnx-ofed-kernel-only is a metadata RPM that requires the MLNX_OFED kernel RPMs only.
Verify that the driver can be reloaded:
# /etc/init.d/openibd restart