Backup to Disk - Synthetic Full - very Slow

[adrian138]

Veeam B&R v11
VMWARE
Backup Repository - NAS Synology - btrfs

Hi there,

I have big performance Problem with Synthetic Full creation which takes way to long to create. Our Fileserver 1.1TB now startet 37hours ago and is now on 22%.

Are there Synology btrfs issues?

Thanks for your help,

adrian

[Mildur]

What repo type are you using? NFS or CIFS?
And whats the bandwidth from the NAS to the backup server?

Is it is CIFS and a low bandwidth, you will get very slow synthentic full speeds. Every block must be transferred to the backup/gateway server, backup server create a new vbk and then all blocks transferred back to the nas.

It would be better to use iscsi and refs, if that‘s the case.
Or change synthentic full to active full if you don‘t have the space to create an iscsi LUN.

[adrian138]

Hi, thanks for your reply.

its a Linux btrfs connection
NAS > Backupswitch > VMWARE Host all 10gbit

I have just seen the Synology NAS maybe needs a Defragmentation, last time it run was 2 years ago!

[Mildur]

And how it is configured in Veeam? What type of Backup Repo?

- Direct attached:
* iscsi to your vbr server
* vmdk on a vmware datastore connected to your synology

- File Protocol
* Cifs Share to the vbr server
* NFS Share to the vbr server

[adrian138]

Repository is connected through NFS (Linux) btrfs

The Vsphere Servers are all connected in Veeam (vmdk runs on a Netapp SAN)

[Mildur]

Ok, if I understand correctly, you have created an NFS Backup Repository in your Veeam Environment.
https://helpcenter.veeam.com/docs/backu ... ml?ver=110

You could try to use active full instead of synthetic full to see, if the performance of the full is better.
With NFS Backup Repo, you don‘t have any advantages in disk usage.
Or you could configure an iscsi LUN, connect it directly to a windows server (2016 or 2019) on the hypervisor and use dieect attached backup repo. If you format it with reFS, you will get the FastClone feature for your synthetic fulls and really good storage savings.
https://helpcenter.veeam.com/docs/backu ... ml?ver=110

[briskik]

Have you resolved your performance issue yet? I too have very slow Synthetic full backup operations with a Synology NAS. The nas has 48 x 7k drives with 2 SSD Cache Drives in Raid1, connected over 10gb CIFS share. Entire Veeam infrastructure is over 10gb network.
I can perform Read/Write within Windows with manually copying single or multiple .VIB or .VBK's from the NAS to Veeambackup server and have acceptable performance. I have one job that backups a 8.9TB server, and is currently 43% of the way done after 260 Hrs running

My single Tape job that takes my backup's from the Synology NAS to tape across the 10gb network is also getting 10MB for performance

[HannesK]

Hello,
and welcome to the forums.

there are two solutions for NAS systems
1) use active full backup jobs to avoid merges
2) mount the NAS as block storage with XFS / REFS and avoid SMB / NFS

if you only read 10MByte/s, then I assume that the gateway server is misconfigured (maybe one in a branch office by keeping automatic selection)

Best regards,
Hannes