Re: [linux-lvm] About online pvmove/lvresize on shared VG
Hi David, Thank for your reply. more questions, On 7/9/2020 12:05 AM, David Teigland wrote: On Wed, Jul 08, 2020 at 03:55:55AM +, Gang He wrote: but I cannot do online LV reduce from one node, the workaround is to switch VG activation_mode to exclusive, run lvreduce command on the node where VG is activated. Does this behaviour is by-design? or a bug? It was intentional since shrinking the cluster fs and LV isn't very common (not supported for gfs2). OK, thank for confirmation. For pvmove command, I cannot do online pvmove from one node, The workaround is to switch VG activation_mode to exclusive, run pvmove command on the node where VG is activated. Does this behaviour is by-design? do we do some enhancements in the furture? or any workaround to run pvmove under shared activation_mode? e.g. --lockopt option can help this situation? pvmove is implemented with mirroring, so that mirroring would need to be replaced with something that works with concurrent access, e.g. cluster md raid1. I suspect there are better approaches than pvmove to solve the broader problem. Sorry, I am a little confused. In the future, we can do online pvmove when VG is activated in shared mode? from man page, I feel these limitations are temporary (or Not Yet Complete). By the way, --lockopt option can help this situation? I cannot find the detailed description for this option in manpage. Thanks Gang Dave ___ 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/
Re: [linux-lvm] About online pvmove/lvresize on shared VG
On Wed, Jul 08, 2020 at 03:55:55AM +, Gang He wrote: > but I cannot do online LV reduce from one node, > the workaround is to switch VG activation_mode to exclusive, run lvreduce > command on the node where VG is activated. > Does this behaviour is by-design? or a bug? It was intentional since shrinking the cluster fs and LV isn't very common (not supported for gfs2). > For pvmove command, I cannot do online pvmove from one node, > The workaround is to switch VG activation_mode to exclusive, run pvmove > command on the node where VG is activated. > Does this behaviour is by-design? do we do some enhancements in the furture? > or any workaround to run pvmove under shared activation_mode? e.g. --lockopt > option can help this situation? pvmove is implemented with mirroring, so that mirroring would need to be replaced with something that works with concurrent access, e.g. cluster md raid1. I suspect there are better approaches than pvmove to solve the broader problem. Dave ___ 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] About online pvmove/lvresize on shared VG
Hello List, I use lvm2-2.03.05, I am looking at online pvmove/lvresize on shared VG, since there are some problems in old code. Now, I setup three node cluster, and one shared VG/LV, and a cluster file system on top of LV. e.g. primitive ocfs2-2 Filesystem \ params device="/dev/vg1/lv1" directory="/mnt/ocfs2" fstype=ocfs2 options=acl \ op monitor interval=20 timeout=40 primitive vg1 LVM-activate \ params vgname=vg1 vg_access_mode=lvmlockd activation_mode=shared \ op start timeout=90s interval=0 \ op stop timeout=90s interval=0 \ op monitor interval=30s timeout=90s \ meta target-role=Started group base-group dlm lvmlockd vg1 ocfs2-2 Now, I can do online LV extend from one node (good), but I cannot do online LV reduce from one node, the workaround is to switch VG activation_mode to exclusive, run lvreduce command on the node where VG is activated. Does this behaviour is by-design? or a bug? For pvmove command, I cannot do online pvmove from one node, The workaround is to switch VG activation_mode to exclusive, run pvmove command on the node where VG is activated. Does this behaviour is by-design? do we do some enhancements in the furture? or any workaround to run pvmove under shared activation_mode? e.g. --lockopt option can help this situation? Thanks a lot. Gang ___ 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/
