On 6/12/2012 10:56 AM, Matthew Whittaker-Williams wrote: > = sunit=0 swidth=0 blks > RAID Level : Primary-6, Secondary-0, RAID Level Qualifier-3 > Size : 40.014 TB > Strip Size : 64 KB > Number Of Drives : 24 This may or may not be directly related to your issue as you describe the problem workload as primarily read oriented. But I should point out you've got a stripe size of 22*64K = 1408KB, yet you're doing 4KB unaligned writeout. An unaligned XFS typically leaves a lot of performance on the table, and can have disastrous results with parity RAID RMW cycles. Though with 4KB writeout you're probably not going to hit the same problem as with misalignment due to incorrect stripe offset, such as specifying an effective stripe size of 1344 when the hardware stripe is 1408 (off by 1 spindle). Is there a particular reason you didn't create these two filesystems with: ~$ mkfs.xfs -d su=64k,sw=22 /dev/sdX Surely I'm missing something. -- Stan _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
