When I setup LVM on top of a 4 disk RAID 10 with f2 layout read/write performance is really worse - it's far below single drive speed... I did some testing with dd and hexdump and I noticed that after writing a 128k file (with 64k "X" and 64k "Y") to the lvol the data on the raw disks looks somewhat weird: sda: sdb: sdc: sdd: ---------------------- YYYY .... .... XXXX .... .... .... .... XXXX YYYY .... .... .... .... .... .... Any hints how to tune this? With LVM on a standard RAID 10 (n2) the data appears as expected on the disks: sda: sdb: sdc: sdd: ---------------------- YYYY YYYY XXXX XXXX .... .... .... .... .... .... .... .... .... .... .... .... -- 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
