slower backup speed with certain OS

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Posts: 6
Comments: 6

Hi,

I'm testing vmprotect 8 with trial. I have vsphere 5.0 with iscsi SAN and vmprotect appliance backup to network share.

I found the backup speed comparing to Windows 2008 R2, Windows 2003 and Linux. The speed was:
- CentOS Linux at about 5 MB/s
- Windows 2003 at about 7 MB/s
- Windows 2008 R2 at about 11 MB/s

All network are Gigabit; the backup was running while network in low traffics; no scheduled task running on any VM being backup; vmtools are installed on all VMs and all vsphere hosts and server with the network share for backup are on the same network switches

Questions:
1. are these speed look normal
2. Should I expect the different between different OS?
3. Any suggest to increase the speed?

Thanks,
Aldous

Tue, 11/13/2012 - 17:01
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Posts: 22
Comments: 3800

Hi Aldous,

First of all I would like to thank you for posting this and other questions here. The questions are quite general ones and the answers may be helpful for other forum users as well.

Now back to the issue: the speed of the backup may be dependent on the type of the guest OS since Acronis vmProtect reads the file system of the disks inside the virtual machine, which means that different file systems may be read with different speed. Also unsupported volumes, such as Linux LVMs or Windows dynamic disks will be read in sector-by-sector mode which is slower than usual method (which excludes unused space, swap files, etc.).

Another reason for relatively slow speed is described in http://forum.acronis.com/forum/37234 thread (in short the reason is reading disks in NBD mode).

For you the best approach would be to install Acronis vmProtect Windows Agent and connect the iSCSI LUN where the VMs disks reside to this Windows machine (via iSCSI initiator). This will allow the disks to be read through iSCSI channel in "direct SAN-access" mode which is faster than via NBD (network) mode.

Thank you.
--
Best regards,
Vasily
Acronis vmProtect Program Managers

Wed, 11/14/2012 - 11:45
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