Base copy problem

[Adam Kasprzak]

Hello!

 

I have red probably all of the "yet another base copy problem" on this forum and still have a problem.

 

I can not get rid of 2 base copies which block all my options. I have 1TB SR (lvm) with 400GB live vm. Besides I have two 200GB base copies of mentioned vm.

 

vhd scan shows:

vhd-util scan -f -a -c -m "VHD-*" -l VG_XenStorage-6fb26ede-883c-e26d-de67-0bd7e7ebe139 -p
vhd=VHD-47cc3579-0357-4f60-a7e5-e96f8ddffd1d capacity=429496729600 size=219034943488 hidden=1 parent=none
  vhd=VHD-9813bb56-1dbc-42fb-8661-f97824a7ab86 capacity=429496729600 size=214127607808 hidden=1 parent=VHD-47cc3579-0357-4f60-a7e5-e96f8ddffd1d
      vhd=VHD-62b6004d-0037-4c43-aabe-9adf04feb244 capacity=429496729600 size=430343979008 hidden=0 parent=VHD-9813bb56-1dbc-42fb-8661-f97824a7ab86

 

Besides I have two VDI to coalesce in the Advanced tab in Xen Orchestra. I have tried rescanning the SR, but without any luck.

 

I can not export VM because there is not enough room to make another snapshot.

 

Attached two screenshots from Xen Orchestra

 

Your help is much appreciated!

Thanks,

Adam

 

[Olivier Lambert]

Check your /var/log/SMlog

 

I have the feeling you don't have enough space to coalesce while the VM is running.

[Adam Kasprzak]

That was probably it. Finally I have shut the vm down, exported it. Deleted vm (base copies have been coalesced) and then imported vm again. I needed half a day for that, but it worked. 

[Olivier Lambert]

Good! You won't have these issues on a thin pro storage, keep that in mind if you can recreate it in the future (or add another disk).

[Adam Kasprzak]

That's true - we do have a fileserver, but I started my journey long time ago with local storage. Now I have a backup Xen server with everyday disaster recovery + full export once a week to zfs fileserver, so from the safety side I think I'm covered.

 

From the other side - having local storage has one big advantage for me. I run a network app with quite big database on vm "server". It is super fast when all of the vms are stored on local ssd, tested that on a machine which was parked on other local hdd and you could feel that it took longer time to read from db.

[Olivier Lambert]

You can have a local storage in thin provisioned too :) (It's called "local ext" and available in XO as "New/Storage/Local ext"). It's as fast as local LVM.