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During the execution of the procedure described in "Deploy VxFlex OS v3.x" for "Prepare the DAX devices" section 9 - "Convert the namespace device to the acceleration device name of type /dev/daxX.X:" The following error might occur → ndctl create-namespace -e namespace0.0 --mode=devdax --align=4K -f failed to reconfigure namespace: Invalid argument
Software issue related to "ndctl" might appear in some cases when the size of the device is not specified - to overcome this issue please follow the steps below
Install/upgrade the following packages to the listed versions below kmod-redhat-nfit-3.10.0_957-1.el7_6.x86_64.rpm ndctl-64.1-2.el7.x86_64.rpm libpmemblk-1.5.1-2.1.el7.x86_64.rpm libpmem-1.5.1-2.1.el7.x86_64.rpm Check the size by executing the next command ndctl list --regions -v Example: (The size is "17179869184" in the example)ndctl list --regions -v[ { “dev”:”region1”, “size”:17179869184, “available_size”:0, “max_available_extent”:0, “type”:”pmem”, “numa_node”:1, “iset_id”:7828749584277088034, “persistence_domain”:”unknown” }, { “dev”:”region0”, “size”:17179869184, “available_size”:17179869184, “max_available_extent”:17179869184, “type”:”pmem”, “numa_node”:0, “iset_id”:-7016240687023610078, “persistence_domain”:”unknown” } ] Instead of the command in section 9 (as described above), please create the namespace using the following command → ndctl create-namespace -f -e namespaceX.X --mode=devdax --align=4K -s <size> Example: ndctl create-namespace -f -e namespace0.0 --mode=devdax --align=4K -s 17179869184{ "dev":"namespace0.0", "mode":"devdax", "map":"dev", "size":"15.75 GiB (16.91 GB)", "uuid":"1040658d-xxxx-xxxx-xxxx-a224f6cd6fa4", "daxregion":{ "id":0, "size":"15.75 GiB (16.91 GB)", "align":4096, "devices":[ { "chardev":"dax0.0", "size":"15.75 GiB (16.91 GB)" } ] }, "align":4096, "name":"o-autolabel" } Validate that the device was created by running " ls /dev/dax*" Example: ls /dev/dax* /dev/dax0.0 /dev/dax1.0
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