Hi. I have read a few days ago that using pvmove is not completely safe. If your system crashes some how in the process then your data is lost. Please some one correct me if i am wrong. A better way is to use mirroring. This are the steps to follow: (i will write vg as the volume group and logicalv as the logical volume) - Connect your new harddrive. - Partition it as LVM. with at least 2 partitions. 1 Big and 1 tinypartition (like a few hundreds of Mb) - Add both partitions with pvcreate and vgextend to your volume group - Make a mirror for your logical volumes. The tiny partition will be for the logs. - lvm will duplicate your data on a live system. You can safaly use the system when lvm does that. - When the copy operation finishes you need to remove the other partition. - For that, set the new mirrored volume again to a lineal volume removing the old partition. - Then use vgreduce and pvremove to delete the old partition. - Disconnect the old harddrive. This is safer, because mirroring duplicates your data transparently when the system is working, without deleting anything, and if the system crashes somehow, your data is not lost, it will continue copying after the reboot. You can also disconnect your harddrive after the copy process is finished, lvm will automatically detect it as a missing PV and set the remaining PV (the new one) as a lineal volume with all your data available, which is exactly what you do with the last 3 steps. pvcreate /dev/sdb1 vgextend /dev/vg /dev/sdb1 pvcreate /dev/sdb2 ------> tiny partition. Each mirrorlog requires something like 4 Mb vgextend /dev/vg /dev/sdb2 lvs -a -o +devices ---> to check what PVs are in use lvconvert -m1 /dev/vg/logicalv ----> to create the mirroring lvs -a -o +devices ----> to see how it changed and what PVs are in use for the new mirrored volume Or you can specify the PVs to use lvconvert -m1 /dev/vg/logicalv /dev/sda1 /dev/sdb1 /dev/sdb2 -----> The old, the new and the mirrorlog. This operation starts inmediatelly copying data, you will have to wait for it to finish but your system will still be working. If some new data is written, it will be copyed too. Now you can, a) disconnect you old disk if it isnt being use for lvm (check it with lvs -a -o +devices) b) disconnect it by software, for maybe, a repartition or to change it to other VG. I never did (a) yet, but did (b): lvconvert -m0 /dev/vg/logicalv /dev/sda1 ---> unset mirroring and remove /dev/sda1, all data will be in sdb1 vgreduce /dev/vg /dev/sda1 pvremove /dev/sda1 And thats it. Cheers. Diego 2009/7/13 Ron Johnson <ron.l.johnson@cox.net>: > Hi, > > Does this thread do an adequate job of documenting the process of removing a > PV from an L? > http://ubuntuforums.org/showthread.php?t=449711 > > The problem is that sdb2 is the largest PV in my LV. > > Is there a simpler way? > > # pvscan > WARNING: Ignoring duplicate config node: filter (seeking filter) > PV /dev/sda1 VG main_huge_vg lvm2 [232.75 GB / 0 free] > PV /dev/sda2 VG main_huge_vg lvm2 [232.75 GB / 0 free] > PV /dev/sda3 VG main_huge_vg lvm2 [232.75 GB / 0 free] > PV /dev/sda4 VG main_huge_vg lvm2 [233.00 GB / 0 free] > PV /dev/sdc1 VG main_huge_vg lvm2 [232.75 GB / 0 free] > PV /dev/sdc2 VG main_huge_vg lvm2 [232.75 GB / 0 free] > PV /dev/sdc3 VG main_huge_vg lvm2 [232.88 GB / 0 free] >>>PV /dev/sdb2 VG main_huge_vg lvm2 [594.25 GB / 0 free] > PV /dev/sdd4 VG main_huge_vg lvm2 [529.00 GB / 0 free] > Total: 9 [2.69 TB] / in use: 9 [2.69 TB] / in no VG: 0 [0 ] > > # df -m /data/big > Filesystem 1M-blocks Used Available Use% Mounted on > /dev/dm-0 2774711 680803 1952962 26% /data/big > > > As you can see, there's a whole lot of extra space on the LV. > > Thanks. > > -- > Scooty Puff, Sr > The Doom-Bringer > > _______________________________________________ > 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/ > _______________________________________________ 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/
