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slow backup using lvm snapshots and tar

Hi list:

I'm using this command to create s snapshot of every LV's server,
mount the LV, make a TGZ to a shared folder (NFS),  then umount LV
image and remove snapshot LV. The problem is tar backup is extremely
slow (it takes 3 hours to make backup of all servers).

This is the command I'm using:

for vps in `cat vps`; do lvcreate -L10G -s -n "$vps"snapshot
/dev/vg0/"$vps".domain-disk && mount /dev/vg0/"$vps"snapshot
/mnt/vmbackup && cd /mnt/vmbackup && nice -n 19 tar pczf
/shared/lvbackups/"$vps"_`date +%F` . && cd ; umount /mnt/vmbackup &&
lvremove -f /dev/vg0/"$vps"snapshot;done

My question is:
How can I make TAR backup faster? is it possible? Is there other
command faster than TGZ in this case?

thanks in advance.

Israel Garcia

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