Comprehensive data protection for all workloads
foggy
Veeam Software
Posts: 19433
Liked: 1763 times
Joined: Jul 11, 2011 10:22 am
Full Name: Alexander Fogelson
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by foggy »

What processes take most of the memory and how much memory does the backup server have? How many tasks are processed at that moment? I also recommend opening a ticket with support regarding that.

zak2011
Expert
Posts: 367
Liked: 41 times
Joined: May 15, 2012 2:21 pm
Full Name: Arun
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by zak2011 »

The memory of the backup server is 12GB. Two backup copy jobs run during this time.

foggy
Veeam Software
Posts: 19433
Liked: 1763 times
Joined: Jul 11, 2011 10:22 am
Full Name: Alexander Fogelson
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by foggy »

Have you contacted support regarding that?

TedLaurent
Service Provider
Posts: 8
Liked: never
Joined: Jan 18, 2017 11:48 pm
Full Name: Ted Laurent
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by TedLaurent »

I currently have the following installation:
1 virtual Windows Server with Veeam Backup and Replication.
- 32 vCPU
- 64 GB RAM
- 7 TB disk (local)

Both local repository and proxy are set to 16 concurrent jobs.
I'm backing up 11 VMs with 2 disks each

The backup only runs 4 backups simultaneously.
The Veeam server is not experiencing any contention for CPU/Memory.

Shouldn't the number of concurrent backups be greater?

Gostev
SVP, Product Management
Posts: 26679
Liked: 4268 times
Joined: Jan 01, 2006 1:01 am
Location: Baar, Switzerland
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by Gostev » 1 person likes this post

There are other "hidden" limits in play too, for example max open VM snapshots per datastore.

TedLaurent
Service Provider
Posts: 8
Liked: never
Joined: Jan 18, 2017 11:48 pm
Full Name: Ted Laurent
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by TedLaurent »

Gostev - thank you for your response. I'm assuming that that limit is 4 when using VMware snapshots. Is there anything that can be done on the vSphere side to increase that limit?

veremin
Product Manager
Posts: 17834
Liked: 1661 times
Joined: Oct 26, 2012 3:28 pm
Full Name: Vladimir Eremin
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by veremin » 1 person likes this post

Try to increase the value, using the following registry key:

Code: Select all

MaxSnapshotsPerDatastore
Thanks!

Gostev
SVP, Product Management
Posts: 26679
Liked: 4268 times
Joined: Jan 01, 2006 1:01 am
Location: Baar, Switzerland
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by Gostev » 1 person likes this post

But be careful: too many open snapshots can overfill the remaining free space on the datastore quickly, and also affect performance for all VMs running on the same datastore due to snapshots adding a significant amount of SCSI reservations.

More importantly, increasing this number will likely reduce your backup performance, as opposed to increasing it. Because the more VMs you backup concurrently from the same datastore, the slower each VM will be backed up, for the reason of limited storage throughput. As a result, each VM's snapshot will remain open for a longer time, and accordingly will take longer to consolidate - which puts further load on the same datastore and results in a snowball effect. So, there's a good reason why the default is no more than 4.

TedLaurent
Service Provider
Posts: 8
Liked: never
Joined: Jan 18, 2017 11:48 pm
Full Name: Ted Laurent
Contact:

Re: Can you run multiple simultaneous backup jobs?

Post by TedLaurent »

Understood. Would there be circumstances were it would be safe to increase that to say 6? I'm backing up about 11 VMs that reside in a SimplivITy cluster. My storage consumption is about 50%. I know SimplivITy has some native backup capabilities but the nodes are extra small so I need to be careful about retention ( I do keep 1 backup that is retained for 4 hours. I plan on using Veeam for longer term backups.

The VMs are your typical Windows variety ... file server, exchange, web, sharepoint and SQL. They don't appear to be highly utilized.

Post Reply

Who is online

Users browsing this forum: Baidu [Spider] and 34 guests