fsck on lvm can be a bit tricky. Like a the normal process, the partition needs to be umounted and we can boot up using the rescue cd or in emergency mode. Normally, you
fsck /dev/sda1
if the partition is lvm, you need to activate the lvm first like so
vgchange --ignorelockingfailure -ay lvscan --ignorelockingfailure (this command should now work) fsck /dev/volumegroup/lvname
if the logical volume contains a partition, you need to kpartx the lv.
Related ArticlesOver the years, there were many attempts to find the best way to partition the hard disk or even the virtual machine. Do you need to have /var, /tmp, /usr…etc as separate partitions? Some people say it depends on what applications your server is running. If it is a mail server, maybe the /var might … Continue reading
Resizing a lvm partition is straight forward if it doesn’t contain a partition table. Simply do a: lvresize -L disksize /dev/vg/lv resize2fs /dev/vg/lv If it is running a virtual machine like xen with a partition table, how to resize the domU, whether to shutdown domU or not depends largely on the partiton structure. In centos, … Continue reading
shrinking a lvm partition is straight forward if it doesn’t contain a partition table. Simply do a: umount lvm_partition resize2fs /dev/vg/lv newSize lvresize -L disksize /dev/vg/lv resize2fs /dev/vg/lv execute the last command if nessary. Assuming you have a partition table in a 10G domU which uses the default partition table, Disk /dev/xenvg/XenWeb: 10.5 GB, 10502537216 … Continue reading
It is a good idea to backup the whole virtual machine to a separate machine to achieve redundancy. 99% uptime and full redundancy can be achieved using on-the-fly mirroring, ie network raid 1. Hardware and network performance will determine if this method will work or not. There are a few software that can achieve this. … Continue reading
I dont see any reason why one should use lvm in xen guest. The whole idea of using lvm is to have the ability to resize disk size easily and resizing a xen guest can be done easily without using LVM. Actually, having LVM in xen guest complicates the process of resizing… You can google … Continue reading