Recently I had a long time test which just untar linux kernel code to two
different directories and compare it in a kvm vm. Those two directories were
two rbd volumes in ceph cluster.
I realized sometimes there’s a diff, but when I manually compare again then
diff disappear. It seems like some files finished write but can not read yet.
In my understanding, client needs waiting until the write data becomes
readable. But in this case the client does not wait for readable.
Is it normal correct behavior or what?
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