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Thanks for the help.

So to force the use of xrdcp command, I recompiled a custom xrootd modifying line 55 of XrdXrootdPgrwAio.hh (new line static const int aioSZ = 1024*1024) and it's working as expected. Any way to change it using some env variable? (tried with XRD_CPCHUNKSIZE but it seems not to be the right param).

After that, I tried to mount the directory xrootd as a FUSE. In my config I disabled the sendfile option (not implemented by the plugin):

xrootd.async force limit 8 maxsegs 8 maxstalls 5 maxtot 4096 segsize 1024k nosf

and from the client side:

xrootdfs -o rdr=root://localhost:8094/my/directory,uid=daemon /my/mount/point
cp /my/mount/point/big.bin ./ # big.bin is 10MiB

but this time I am getting async-read request (i.e. aio_nbytes) of 131 KiB (still not 1MiB).
What am I doing wrong?

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