On 5/25/2012 5:37 AM, Joe Landman wrote: > Hi folks: Hi Joe, I may be all wet here, but this is the only thing that jumped out at me: > meta-data=/dev/md20 > data = sunit=8 swidth=56 blks > log =internal sunit=8 blks 8*56KB (or 7*64KB) = 448KB write out > [root@siFlash ~]# mdadm --detail /dev/md20 > /dev/md20: > Version : 1.2 > Raid Devices : 8 > Layout : left-symmetric > Chunk Size : 32K 7*32KB = 224KB stripe size > All this said, deletes from this unit are taking 1-2 seconds per file ... > Anything obvious that we are doing wrong? Other than your XFS writeout being apparently twice the size of your RAID stripe, nothing else stands out that I can see. I'm not a block layer expert. And since mkfs.xfs came up with 448KB, apparently this should be fine. However, everything in the literature, and the experts on this list, tells us to always precisely align XFS to the RAID stripe. That doesn't seem to be the case here. -- Stan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
