Discussions specific to the VMware vSphere hypervisor
Kirill.Naumenko
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Re: Active snapshots limit reached for datastore

Post by Kirill.Naumenko » Feb 10, 2019 4:57 pm

Andreas Neufert wrote:
Feb 10, 2019 12:42 pm
Each time we create a snapshot for a VM we check how many snapshots we have created for backup. This is per Datastore. There is no counter, we check actual situation.
Sorry but how other jobs that stucking on such step - "Active snapshots limit reached for datastore" understand how many snapshots on datastore if Veeam don't have counter about it?
I have more then 80 jobs on different datastores - and I don't understand how many snapshots at different time exist.
I have different datastores -VSAN, ISCSI on Windows,Linux repositories - is it normal to change this parameter for all of them at one time?

Andreas Neufert
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Re: Active snapshots limit reached for datastore

Post by Andreas Neufert » Feb 12, 2019 9:54 am 1 person likes this post

As I said this was configured in a way that there will be no issues at our 300.000 VMware customers. Individual storages are much faster and do not run into high latency when you create snapshots or snapshot commits. So you need to test maybe in a way by increasing the setting by 1 each day and see if you run into issues.

Andreas Neufert
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Re: Active snapshots limit reached for datastore

Post by Andreas Neufert » Feb 12, 2019 9:54 am

At performance tests we usually use arround 20 snapshots.

Hoegimator
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[MERGED] Resource not ready: Active snapshots limit reached for datastore

Post by Hoegimator » Feb 21, 2019 12:28 pm

Hi all,

We are running v.9.5.0.1922, our vSphere Storage is Cisco Hyperflex v.3.5(2a) with ESXi 6.5u2.

Today I saw the limitation of active Snapshots "Resource not ready: Active snapshots limit reached for datastore".
All the Google researches pointe to the registry entry "MaxSnapshotsPerDatastore (REG_DWORD)", but we don't have that registry entry.

Therefore my first question is, where is that limitation set?
Secondary, is that "MaxSnapshotsPerDatastore" registry still valid?

Thanks for any advise
Joerg

scott.anderson
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Re: Active snapshots limit reached for datastore

Post by scott.anderson » May 06, 2019 1:31 am

The current limit of 4 is extremely conservative. Its fair if you have an older vSphere/Storage solution, but most current implementation of vSphere on a modern storage solution would have no difficulty processing a lot more than that. We have to pretty much "tweek" this on every implementation now as its actually causing a significant bottle neck in job processing, for no real reason. Would really like to see this as an GUI option on the vSphere cluster or hosts properties in the Backup Infrastructure. That way its not left to people hacking the registry to "fix" it.

TimeKnight
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Re: Active snapshots limit reached for datastore

Post by TimeKnight » Jun 12, 2019 3:10 pm

I do not know if this is working correctly in 9.5u4a. I have a greenfield installation of 9.5u4 and in one of my backups jobs I have added a VMware Datastore cluster that contains two datastores. When I run this job, it will only process 4 VMs at a time instead of 8. Does it treat a datastore cluster of multiple datastores at 1 datastore or am I missing something else?

Gostev
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Re: Active snapshots limit reached for datastore

Post by Gostev » Jun 12, 2019 3:31 pm

No, this limit is per individual datastore.

marius roma
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Re: Active snapshots limit reached for datastore

Post by marius roma » Aug 01, 2019 7:15 am

I read the previous posts but I am a little bit confused.
I am using B&R version 9.5.4.2615 and I got the message "Active snapshots limit reached for datastore" but I cannot reduce the number of snapshots in my infrastructure.
So, what should I do in order to:
  • Verify that the number of snapshots is really critical (I am not sure it is…)
  • Verify which datastore is affected
  • Ensure that my job can go on working?
Regards
marius

foggy
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Re: Active snapshots limit reached for datastore

Post by foggy » Aug 01, 2019 2:53 pm 1 person likes this post

Hi Mario, have you played with the registry value mentioned above?

marius roma
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Re: Active snapshots limit reached for datastore

Post by marius roma » Aug 01, 2019 3:36 pm

To be honest I simply solved the problem by reducing the number of snapshots.
If changing the registry values is the right solution I'll apply it as soon as I face the problem again.
Regards
marius

foggy
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Re: Active snapshots limit reached for datastore

Post by foggy » Aug 01, 2019 4:46 pm 1 person likes this post

Yes, it might help in case reducing the number of snapshots is not an option.

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