Hi, I'm trying to create a raid1 but when I want create my LV, I get the following error : # device-mapper: reload ioctl on failed: Invalid argument # Failed to activate new LV. My command is : lvcreate --type raid1 -m 1 -L 55G -n lv0 vg0 Vgdisplay : --- Volume group --- VG Name vg0 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 63 VG Access read/write VG Status resizable MAX LV 0 Cur LV 0 Open LV 0 Max PV 0 Cur PV 2 Act PV 2 VG Size 1.09 TiB PE Size 4.00 MiB Total PE 285588 Alloc PE / Size 0 / 0 Free PE / Size 285588 / 1.09 TiB VG UUID k7hTZD-QXLt-LO34-Fc5P-vk5T-zcOL-2JgZmr --- Physical volumes --- PV Name /dev/mapper/mpatha PV UUID ccouAp-S0ew-vAWv-nRSc-VgA3-bzFi-pfHDqA PV Status allocatable Total PE / Free PE 142794 / 142794 PV Name /dev/mapper/mpathd PV UUID v3nfWQ-w7eU-jrnk-PDMW-Rxnc-cMAe-qn4F5e PV Status allocatable Total PE / Free PE 142794 / 142794 If I do not specify the type, it works well ( lvcreate -m 1 -L 55G -n lv0 vg0) but in this case it's a mirror and I need a raid1. Any help is welcome :) Regards, Thomas # lvm version LVM version: 2.02.95(2)-RHEL6 (2012-10-16) Library version: 1.02.74-RHEL6 (2012-10-16) Driver version: 4.20.0 _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/