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On Tue, 2005-06-14 at 18:13, Peter Chubb wrote: > >>>>> "Badari" == Badari Pulavarty <pbadari@us.ibm.com> writes: > > Badari> What kernel are you running ? Does the kernel has ext3 > Badari> "reservation" support enabled ? > 2.6.11, and yes, although it's not set in the mount options. 2.6.11 has "reservation" turned ON by default. You should be fine. > > > Badari> Do you see performance problem > Badari> with "read" tests also ? > > Yes. Hmm. > > Badari> And also, does the write test writes > Badari> to multiple files in the same directory ? Or multiple threads > Badari> writing to same file ? > > It's standard iozone --- mutliple processes writing to multiple files in > the same directory. If you are running multiple files in the same directory, without reservations files will be badly fragmented. Can you run "filefrag" on the files ? (I am also assuming each process writes to its own file). Thanks, Badari > > All the mount options are the defaults. > > A sample test is: > > mdadm -Ss > mdadm -C /dev/md0 -l 0 -c 1024 -n 2 -R /dev/sdc /dev/sdk > mke2fs -j /dev/md0 > mount /dev/md0 /shift/oplapro97/data01 > cd /shift/oplapro97/data01 > iozone -MCew -t1 -f IOZONE -s32g -r256k -i0 -i1 > ~/tests/unsw_ext3/iozone_2_disk_1stream_ext3 > rm -rf /shift/oplapro97/data01/* > iozone -MCew -t2 -f IOZONE -s32g -r256k -i0 -i1 > ~/tests/unsw_ext3/iozone_2_disk_2stream_ext3 > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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