I think we have two different threads here... As an additional note to what Phil mentioned just now, try :
`dd if=/mnt/pvfs2/abc.ts of=~/ bs=65536` This will give you an idea of some better performance that is achievable through the vfs mount for pvfs2. ~Kyle Kyle Schochenmaier 2009/10/22 Phil Carns <[email protected]>: > 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 > _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
