Snapshot Backups + Ramdisk LV + vzdump

[lechup]

I'm trying to overcome I/O performance problems when backup and image store is on the same PV (I guess snapshot LV is a problem). I've created LV in ramdisk, and use such crontabbed script to backup image files saved on /dev/pve/data:

# setup PV and LV
vgextend pve /dev/ram0
vgextend pve /dev/ram1
lvcreate -L 984MB -s pve/data -n ramsnap /dev/ram0 /dev/ram1
mount /dev/pve/ramsnap /backup/ramsnap


# backup
mkdir /backup/vm/$BACKUP_ID
rsync -rv /backup/ramsnap/ /backup/vm/$BACKUP_ID/


# clear 
umount /backup/ramsnap
lvremove /dev/pve/ramsnap -f

Now I do not have performance I/O issues while backuping, but I would rather to use vzdump tool.

I didin't find simple way to set details of how to create snapshot LVs - Am I missing something obvious?

Maybe hook script is the right place to look at? I've skimmed it just once but found bash/rsync way simpler to implement for now...

 

[dietmar]

There is no way to configure that, sorry.

 

[lechup]

Thanks for clear statement! If somebody is interested in configuring I/O problemless snapshot backups see: http://django-geek.blogspot.com/2012/06/io-problems-on-ovh-proxmox-lvm2.html