On 5/23/23 15:58, Gregory Farnum wrote:
On Tue, May 23, 2023 at 3:28 AM Dietmar Rieder <dietmar.rieder@xxxxxxxxxxx> wrote:Hi, can the cephfs "max_file_size" setting be changed at any point in the lifetime of a cephfs? Or is it critical for existing data if it is changed after some time? Is there anything to consider when changing, let's say, from 1TB (default) to 4TB ?Larger files take longer to delete (the MDS has to issue a delete op on every one of the objects that may exist), and longer to recover if their client crashes and the MDS has to probe all the objects looking for the actual size and mtime. This is all throttled so it shouldn't break anything, we just want to avoid the situation somebody ran into once where they accidentally created a 1 exabyte RBD on their little 3-node cluster and then had to suffer through "deleting" it. :D -Greg
Thanks for your detailed explanation.Would it also be ok if we set the max to 5 TB create some big files (>1TB) and then set the max back to 1 TB? Would the big files then still be available and usable?
Best Dietmar
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