Tape Drives / iSCSI

I never tested it with 2.6.35. I most projects we recommend a backup tool supporting remote media agents (e.g. latest Backupexec with the Linux agent installed on Proxmox VE if you run Windows boxes). faster.
 
thanks tom. I thought about that, too. but with kernel 2.6.32 everything works fine. I´m still waiting for SCSI-Passthrough like VMware did for my KVM Windows machines.
 
hi tom,

I tested it now with windwos 2008 r2 x64 and backupexec 2010 r2 and the linux media server agent. But with virtio net on the 2k8 r2 guest I get only about 700MB/min to tape. On native 2k8 install I get about 3500MB/min to tape. Is there perhaps an issue with the 2k8 virtio drivers? On W2K3 I got about 1300MB/min to tape. I´m confused I though vhost-net would boost the guest to host performance. I do not want to install native w2k8 because I need this host for 2 more machines. Are there any tweaks to this constellation?
 
I am using pretty the same on a site. Here is my setup and the backup results.

Proxmox VE host (2.6.32, latest)
Intel SH3200, Intel(R) Xeon(R) CPU 3050 @ 2.13GHz
Adaptec Raid 5808Z, 4 x 1 GB WD RE2 in Raid10

Code: 
pveperf
CPU BOGOMIPS:      8534.59
REGEX/SECOND:      696225
HD SIZE:           94.49 GB (/dev/mapper/pve-root)
BUFFERED READS:    180.00 MB/sec
AVERAGE SEEK TIME: 7.94 ms
FSYNCS/SECOND:     2655.37
DNS EXT:           79.55 ms
DNS INT:           1.24 ms (mydomain.com)
On this host, I got a HP LTO3 on a dedicated Adaptec SCSI adapter.

The windows 2008r2 guest
cat /etc/qemu-server/126.conf

Code: 
name: servername
ostype: w2k8
memory: 1280
sockets: 1
boot: ca
freeze: 0
cpuunits: 1000
acpi: 1
kvm: 1
onboot: 0
cores: 1
virtio1: local:126/vm-126-disk-1.raw,cache=none
virtio2: local:126/vm-126-disk-2.raw,cache=none
bootdisk: virtio1
vlan0: virtio=3E:79:68:B5:1F:82
Backup Exec
I installed Backup Exec 2010r2 (now also sp1) on the windows guest and the Linux agent on the host.

Backup performance
Backup files from the (local) Proxmox VE host:
Code: 
Backed up 1466 files in 166 directories.
Processed 202519786615 bytes in  58 minutes and  56 seconds.
Throughput rate: 3277 MB/min
Compression Type: Hardware
Backup files from another Proxmox VE host (another node):
Code: 
Backed up 78918 files in 44809 directories.
Processed 128340564844 bytes in  49 minutes and  47 seconds.
Throughput rate: 2459 MB/min
Compression Type: Hardware
Exchange DB on a remote Proxmox VE (also running as KVM):
Code: 
Backed up 1 Exchange Server stores
Processed 18.302.021.910 bytes in  11 minutes and  49 seconds.
Throughput rate: 1477 MB/min
Compression Type: Hardware
 
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