Hi All, I was running some experiments on my 3-node ceph cluster (mounted at /mnt/ceph), and noticed unexpected behavior regarding cephfs set_layout command.
root@varunc-virtual-machine:/mnt/ceph/folder1# touch test3 root@varunc-virtual-machine:/mnt/ceph/folder1# cephfs test3 set_layout -p 3 -s 41943040 root@varunc-virtual-machine:/mnt/ceph/folder1# cephfs test3 show_layout layout.data_pool: 3 layout.object_size: 41943040 layout.stripe_unit: 4194304 layout.stripe_count: 1 root@varunc-virtual-machine:/mnt/ceph/folder1# vi test3 root@varunc-virtual-machine:/mnt/ceph/folder1# cephfs test3 show_layout layout.data_pool: 0 layout.object_size: 4194304 layout.stripe_unit: 4194304 layout.stripe_count: 1 I create an empty file and set its layout (which it displays correctly in the corresponding show_layout). Then, I open the file and write something to it (a single line of text), and again use the show_layout command, and it reverts to the default layout. What is the reason for this? Is it that I can not write to the file simply using vi editor? Because when I do the same process again, but instead use cat command to redirect the input into the new file, the layout set by me persists. root@varunc-virtual-machine:/mnt/ceph/folder1# touch test4 root@varunc-virtual-machine:/mnt/ceph/folder1# cephfs test4 set_layout -p 3 -s 41943040 root@varunc-virtual-machine:/mnt/ceph/folder1# cephfs test4 show_layout layout.data_pool: 3 layout.object_size: 41943040 layout.stripe_unit: 4194304 layout.stripe_count: 1 root@varunc-virtual-machine:/mnt/ceph/folder1# cat file1.txt > test4 root@varunc-virtual-machine:/mnt/ceph/folder1# cephfs test4 show_layout layout.data_pool: 3 layout.object_size: 41943040 layout.stripe_unit: 4194304 layout.stripe_count: 1 Also, how do I set the layout for an entire directory. I tried the following: root@varunc-virtual-machine:/mnt/ceph# cephfs folder2/ set_layout -p 3 -s 4194304 Error setting layout: Invalid argument root@varunc-virtual-machine:/mnt/ceph# cephfs folder1/ set_layout -p 0 -s 4194304 Error setting layout: Invalid argument (folder1 contains around 1000 files, folder2 is empty) Thanks, Varun
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