Hello guys:

I'd like you to share some thoughs about my scenario and performance.
Here's what I have:

Server (Director & Storage)
====================
System: KVM guest running on Proxmox 4.1 host
Network: virtio
Storage: 5x200 GB Virtual disks (qcow2 format), used as physical volumes
Filesystem: ext4 'by default' on LVM
Memory: 4 GB
CPU: 1 core on guest, 8 cores on host (Intel Core i7 3.4 GHz)
Bacula: 7.4.0 built from source
OS: CentOS 7 x86_64
Roles: Bacula with MySQL (used only for backups, nothing else)

- iperf tests between my bacula server and one of my clients (which is
also a KVM guest sharing the same physical host with virtio network)
gave me near 9.78 Gbps rate which seems awesome.
- I'm using disk backups without Attribute Spooling enabled, yet.
- GZIP compression and SHA1 signatures are also enabled for all my jobs.
- MySQL hasn't been tuned at all, it came by default.

Yesterday, I ran a Full backup for a Samba fileserver with 280 GB of
data. Such backup took about 6 hours, having near 15% compression rate
and near 240 GB written by SD and FD daemons. This Samba server have
Bacula Client 2.4.4.

Today I'm running a Full backup for a Zimbra server with near 450 GB
of data to be backed up. I'm running iptraf-ng right now and I can see
variable rate transfer through my network interface from 10 Mbps up to
80 Mbps with an average of 50 Mbps.

I'd like to hear some thoughts from you because I have some questions:

- Is it normal to have a rate of 50 Mbps rate while running a backup?
- How can I know if MySQL is a bottleneck?
- Should I disable compression and signatures to improve speed of
backups? Is it worth it?
- What if I enable attribute spooling? I've read posts in which some
people noticed an improvement on data transfer but the despooling
process of attributes it took too long.
- Is my backup speed good enough? Should I worry about it? Can they be
even faster?

Thanks in advance for reading and helping :)

Have a nice day

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