On Thu, Oct 30, 2008 at 6:22 PM, Bryn M. Reeves <bmr@redhat.com> wrote: > rae l wrote: >> How to make lvm error handling robust? >> >> Steps: >> 1. create pv,vg,lv on multiple disks, one group (sda,sdb,sdc), other >> groups (sdd, sde, ...); >> 2. unplug one disk (sda, one pv); >> >> then all LVM broken, even other unrelated groups of lvm cannot work >> from then on, > > Not been the case when I've encountered this situation. The affected VG > can only be activated in partial mode but all other VGs should continue > to operate just fine. The real problem is: 1. When one PV corrupted, the information of VG and LV on this VG will remain in the Linux Kernel and keep until rebooting; Steps: 1. pvcreate /dev/sd[a-c] 2. vgcreate vg1 /dev/sd[a-c] 3. lvcreate -n lv1 -L 200G vg1 now the PV/VG/LV all looks good, lvs will display them all; Then one PV corrupted (hard disk fail, or some program does stupid thing), do like this: 1. dd if=/dev/zero of=/dev/sda then pvs/vgs/lvs will all report errors, cannot find the required information, Couldn't find all physical volumes for volume group vg1. Even I cannot remove it: 1. lvremove /dev/mapper/vg1-lv1 2. vgremove vg1 Only after rebooting, the stupid error message will go. So the real problem is how to strip the stupid error message without a reboot? Thank you. > >> all lvm commands report error and stops executing. >> >> How to solve this? > > Plan your storage better. If you're placing VGs on single disk devices > then you should use LVM2's redundancy features - by creating mirrored > LVs you would avoid a single disk becoming a single point of failure. > > Alternately, address redundancy further down the stack by using hardware > or software RAID to add redundancy and fault tolerance to the storage > being managed by LVM2. > > Regards, > Bryn. -- Cheng Renquan, Shenzhen, China George Carlin - "The other night I ate at a real nice family restaurant. Every table had an argument going." _______________________________________________ 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/
