Personally I always go MD+LVM. It is faster (MD can do parallel reads in RAID1) and it requires only 2 disks (if you do not want to rebuild the mirror after every reboot) and MD is designed just to do RAID, and it does it very well. It is also more flexible. Also I have … Read more
Revised answer: LXC containers share the same kernel as the host, so any filesystem they mount should be accessible from outside. If you do a cat /proc/mounts on the host, can you see the container filesystems? If you see a line like /dev/mapper/… /var/lib/lxc/o1/rootfs ext4 … then you should be able to access /var/lib/lxc/o1/rootfs from … Read more
LVM does backup it’s metadata to /etc/lvm/backup and /etc/lvm/archive. At the top of each file it will tell you the time/data when the file was generated so chances are you’ll have a copy of the older metadata as it was before you deleted the LV. I believe the backup is automatic anytime the metadata changes. … Read more
The meaning of the o in the output of lvs is described in its manpage, under the lv_attrs attributes section: 6 device (o)pen Basically this means the device has been mounted.
Yes, I also checked out all on-disk layout of MBR/PBR/GPT/MD/LVM, and came to the same conclusion. For your case (LVM on raw disk), if LVM-PE(physical extent) is 1MB-aligned with pvcreate, you can be sure all futher data allocation will be aligned, as long as you keep allocation size to (1MB * N). Since both “vgcreate … Read more
Sure, of course it’s possible. dd if=/dev/mygroup-mylv | ssh 192.168.1.103 dd of=/dev/newvgroup-newlv Boom. Do yourself a favor, though, and use something larger than the default blocksize. Maybe add bs=4M (read/write in chunks of 4 MB). You can see there’s some nitpicking about blocksizes in the comments; if this is something you find yourself doing fairly … Read more
The whole point of UUIDs is to uniquely identify something, and what you’re trying to do makes them non-unique. I highly doubt that this is possible. I played around with pvchange -u to change the UUID of a duplicated PV, but the operation always failed. If you really need to mount the backups on the … Read more
As yoonix pointed out in the comment, the pvresize without options resizes physical volume to the size the operating system reports for the underlying partition. pvresize /dev/sdXY –setphysicalvolumesize option can be used to shrink the physical volume or to override the operating system autodetected size (if for some reason is wrong). To extend a logical … Read more
After a bit of trial and error… as mentioned in the possible answers, it turned out to require xfs_growfs rather than resize2fs. CentOS 7, fdisk /dev/xvda Create new primary partition, set type as linux lvm. n p 3 t 8e w Create a new primary volume and extend the volume group to the new volume. … Read more
What does the logical volume contain? Is it a filesystem (I accidentally wrote partition)? Could it be it’s mounted? In that case: umount /dev/my-volumes/volume-1 Does it have any active snapshots? Edit: try lvchange -an -v /dev/my-volumes/volume-1 and lvremove -vf /dev/my-volumes/volume-1. Edit 2: please post ‘lvs’. Edit 3: Try this with some other problematic volume. It’s … Read more