Hi, I'm trying to use LVM together with md. I know you guys don't recommend this combination, but I need it to get good performance from our disks plus some protection. This combination used to work with 0.3, but stop working with the new 1.0.7. I think the problem is that after rebooting LVM has problem figuring out that it needs to use md0-3 and not their corresponding part (/dev/sd?). Have you done this before? I'm adding the series of commands we used to create the volume, plus the status after we reboot the machine. CREATING THE VOLUME # cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid5] [multipath] read_ahead 1024 sectors md4 : active raid0 md3[3] md2[2] md1[1] md0[0] 143372288 blocks 512k chunks md3 : active raid1 sdi[1] sdh[0] 35843584 blocks [2/2] [UU] md2 : active raid1 sdg[1] sdf[0] 35843584 blocks [2/2] [UU] md1 : active raid1 sde[1] sdd[0] 35843584 blocks [2/2] [UU] md0 : active raid1 sdc[1] sdb[0] 35843584 blocks [2/2] [UU] unused devices: #dd bs=256k if=/dev/zero of=/dev/md0 count=1000 #dd bs=256k if=/dev/zero of=/dev/md1 count=1000 #dd bs=256k if=/dev/zero of=/dev/md2 count=1000 #dd bs=256k if=/dev/zero of=/dev/md3 count=1000 # pvcreate /dev/md0 pvcreate -- physical volume "/dev/md0" successfully created # pvcreate /dev/md1 pvcreate -- physical volume "/dev/md1" successfully created # pvcreate /dev/md2 pvcreate -- physical volume "/dev/md2" successfully created # pvcreate /dev/md3 pvcreate -- physical volume "/dev/md3" successfully created # vgcreate vg01 /dev/md[0-3] vgcreate -- INFO: using default physical extent size 32 MB vgcreate -- INFO: maximum logical volume size is 2 Terabyte vgcreate -- doing automatic backup of volume group "vg01" vgcreate -- volume group "vg01" successfully created and activated # pvscan pvscan -- reading all physical volumes (this may take a while...) pvscan -- ACTIVE PV "/dev/md0" of VG "vg01" [34.12 GB / 34.12 GB free] pvscan -- ACTIVE PV "/dev/md1" of VG "vg01" [34.12 GB / 34.12 GB free] pvscan -- ACTIVE PV "/dev/md2" of VG "vg01" [34.12 GB / 34.12 GB free] pvscan -- ACTIVE PV "/dev/md3" of VG "vg01" [34.12 GB / 34.12 GB free] pvscan -- inactive PV "/dev/md4" of VG "vg01" [34.12 GB / 34.12 GB free] pvscan -- WARNING: physical volume "/dev/sdb" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdc" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdd" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sde" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdf" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdg" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdh" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdi" belongs to a meta device pvscan -- total: 13 [170.92 GB] / in use: 13 [170.92 GB] / in no VG: 0 [0] #lvcreate -i 4 -I 512 -L 130G -n lv01 vg01 lvcreate -- doing automatic backup of "vg01" lvcreate -- logical volume "/dev/vg01/lv01" successfully created # vgdisplay -v --- Volume group --- VG Name vg01 VG Access read/write VG Status available/resizable VG # 0 MAX LV 256 Cur LV 1 Open LV 0 MAX LV Size 2 TB Max PV 256 Cur PV 4 Act PV 4 VG Size 136.50 GB PE Size 32 MB Total PE 4368 Alloc PE / Size 4160 / 130 GB Free PE / Size 208 / 6.50 GB VG UUID tXh4cm-QVz6-bT6a-yLRl-PnHc-cY16-72aPfp --- Logical volume --- LV Name /dev/vg01/lv01 VG Name vg01 LV Write Access read/write LV Status available LV # 1 # open 0 LV Size 130 GB Current LE 4160 Allocated LE 4160 Stripes 4 Stripe size (KByte) 512 Allocation next free Read ahead sectors 1024 Block device 58:0 --- Physical volumes --- PV Name (#) /dev/md0 (1) PV Status available / allocatable Total PE / Free PE 1092 / 52 PV Name (#) /dev/md1 (2) PV Status available / allocatable Total PE / Free PE 1092 / 52 PV Name (#) /dev/md2 (3) PV Status available / allocatable Total PE / Free PE 1092 / 52 PV Name (#) /dev/md3 (4) PV Status available / allocatable Total PE / Free PE 1092 / 52 AFTER REBOOT # pvscan pvscan -- reading all physical volumes (this may take a while...) pvscan -- inactive PV "/dev/md0" of VG "vg01" [34.12 GB / 1.62 GB free] pvscan -- inactive PV "/dev/md1" of VG "vg01" [34.12 GB / 1.62 GB free] pvscan -- inactive PV "/dev/md2" of VG "vg01" [34.12 GB / 1.62 GB free] pvscan -- inactive PV "/dev/md3" of VG "vg01" [34.12 GB / 1.62 GB free] pvscan -- inactive PV "/dev/md4" of VG "vg01" [34.12 GB / 1.62 GB free] pvscan -- WARNING: physical volume "/dev/sdb" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdc" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdd" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sde" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdf" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdg" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdh" belongs to a meta device pvscan -- WARNING: physical volume "/dev/sdi" belongs to a meta device pvscan -- total: 13 [170.92 GB] / in use: 13 [170.92 GB] / in no VG: 0 [0] [root@sculpin root]# vgdisplay -v --- Volume group --- VG Name vg01 VG Access read/write VG Status available/resizable VG # 0 MAX LV 256 Cur LV 1 Open LV 0 MAX LV Size 2 TB Max PV 256 Cur PV 4 Act PV 4 VG Size 136.50 GB PE Size 32 MB Total PE 4368 Alloc PE / Size 4160 / 130 GB Free PE / Size 208 / 6.50 GB VG UUID tXh4cm-QVz6-bT6a-yLRl-PnHc-cY16-72aPfp --- Logical volume --- LV Name /dev/vg01/lv01 VG Name vg01 LV Write Access read/write LV Status available LV # 1 # open 0 LV Size 130 GB Current LE 4160 Allocated LE 4160 Stripes 4 Stripe size (KByte) 512 Allocation next free Read ahead sectors 1024 Block device 58:0 --- Physical volumes --- PV Name (#) /dev/sdc (1) PV Status available / allocatable Total PE / Free PE 1092 / 52 PV Name (#) /dev/sde (2) PV Status available / allocatable Total PE / Free PE 1092 / 52 PV Name (#) /dev/sdg (3) PV Status available / allocatable Total PE / Free PE 1092 / 52 PV Name (#) /dev/sdi (4) PV Status available / allocatable Total PE / Free PE 1092 / 52