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Device file in /dev/mapper/ present even after removing partition with parted

These observations are from CentOS 6.3 and 6.4. I have a multipath device with a single partition: # ls -l /dev/mapper/ total 0 crw-rw---- 1 admin root 10, 57 Dec 22 12:52 control lrwxrwxrwx 1 admin ...
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1answer
188 views

No ouptut from kpartx -av and -l

I am trying to learn how to use kpartx, and am having some trouble. My end goal is to use nested LVMs for virtual machines, where the VM's "/home" is in one nested LVM and the rest of the VM is on a ...
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1answer
210 views

kpartx verbose info: what does it mean?

When mounting images with the wonderful kpartx in verbose mode it displays some, likely very useful, information: # kpartx -av wheezy_cln.img add map loop0p1 (252:2): 0 131072 linear /dev/loop0 2048 ...
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3answers
436 views

Opening a Qemu/Xen file based VM Image (won't boot after upgrade)

Apart from one Virtual Host still running Xen/RHEL5, all our virtual capability is hosted on KVM hosts with LVM storage devices. I've stupidly attempted an Ubuntu full release upgrade on a guest ...
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484 views

poor performance with vmdk mounted as loop device even after conversion to raw

Edit 13/12/12 - At this stage it would appear to be related to Western Digital (and possibly others) Advanced Format 4K block sizes. This link goes some way into describing the issue, however the ...
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385 views

Backing up LVM volume with multiple partitions

I want to create a backup of a LVM volume (Xen DomU's), however a LVM volume can have multiple partitions and those are dynamic (I cannot guarantee LVM #1 has 1 partition and LVM #2 has 3 etcetera). ...
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1answer
3k views

losetup -d giving : device busy

I am mounting a KVM disk (LVM) following these commands : # losetup /dev/loop0 foo.img # kpartx -av /dev/loop0 # mount /dev/mapper/loop0p1 /mnt # unmount /mnt # kpartx -dv /dev/loop0 # losetup -d ...