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There is no backup of date. Most important first.
Home filesystem has quotas active, temporary diskspace can be requested through workspace mechanism.
For home and workspace filesystems, best performance is achieved with large I/O in blocks > 4MB. All filestytems can be accessed from SXes and frontends under same path.
Avoid formated I/O on SX, try to do large block, unformated I/O.
You can use the variables F_SETBUF and C_SETBUF to set buffer size of standard buffered I/O.
For fast local I/O, you can create a directory in /raid/tmp, this is a fast node local disk space. Please make sure that you clean that directory at job end!