Hi, The cp command line tool is likely using much smaller access sizes than pvfs2-cp to transfer data. You can confirm by running cp in strace to look at what sizes the read() or write() operations are. In pvfs2-cp you can toggle the access size with the -b option.
-Phil 谢长才 wrote: > Hi dear Rob: > I use two I/O data servers, one of them acts as metadata server, > when i run pvfs2-cp /mnt/pvfs2/abc.ts ~/ > the read speed can reach 11MBytes/s > but when i mount the pvfs2 system to /mnt/pvfs2 entry > and then run cp abc.ts ~/ the speed only can reach 4Mbytes/s . > how can i solve this problem ??? > i know it's slower ,but why only reach 50 persent . _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
