On Sat, May 07, 2011 at 12:09:46PM -0400, Justin Piszcz wrote: > Hello, > > Using 2.6.38.4 on two hosts: > > Host 1: > $ /usr/bin/time find geocities.data 1> /dev/null > 80.92user 417.93system 2:19:07elapsed 5%CPU (0avgtext+0avgdata 105520maxresident)k > 0inputs+0outputs (0major+73373minor)pagefaults 0swaps > > # xfs_db -c frag -f /dev/sda1 > actual 40203982, ideal 40088075, fragmentation factor 0.29% > > meta-data=/dev/sda1 isize=256 agcount=44, agsize=268435455 blks > = sectsz=512 attr=2 > data = bsize=4096 blocks=11718704640, imaxpct=5 > = sunit=0 swidth=0 blks > naming =version 2 bsize=4096 ascii-ci=0 > log =internal bsize=4096 blocks=521728, version=2 > = sectsz=512 sunit=0 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > -- > > Host 2: > $ /usr/bin/time find geocities.data 1>/dev/null > 54.60user 337.20system 48:42.71elapsed 13%CPU (0avgtext+0avgdata 105632maxresident)k > 0inputs+0outputs (1major+72981minor)pagefaults 0swaps > > # xfs_db -c frag -f /dev/sdb1 > actual 37998306, ideal 37939331, fragmentation factor 0.16% > > meta-data=/dev/sdb1 isize=256 agcount=10, agsize=268435455 blks > = sectsz=512 attr=2 > data = bsize=4096 blocks=2441379328, imaxpct=5 > = sunit=0 swidth=0 blks > naming =version 2 bsize=4096 ascii-ci=0 > log =internal bsize=4096 blocks=521728, version=2 > = sectsz=512 sunit=0 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > > -- > > Host 1: RAID-6 (7200 RPM Drives, 18+1 hot spare) Those will be 3TB drives > Host 2: RAID-6 (7200 RPM Drives, 12) and those are 1TB drives. Different hardware is guaranteed to give you different performance, especially from a seek capability perspective. > Each system uses a 3ware 9750-24i4e controller, same settings. > > Any thoughts why one is > 2x faster than the other? Different filesystem sizes mean different directory, inode and data layouts, especially if you are using inode64. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
