After replication jobs, hosts lost connection to the CSV

[Borsh]

Hello!
We have two site: A and B. In each of them there are two hyper-v 2008 r2 clusters with 6 CSV.
Veeam B&R 6.5.0.144 (with patch 3). After patch is installed on veeam server all hosts were rebooted.
Onhost backup proxy and MS VSS hardwire provider is used.
We start multiple replication jobs and after their completion, Hyper-V hosts lost connection to the CSV volume, on which the replicated virtual machine are located.
Event ID in MS event viewer on hosts: 1584, 5120.
MS Hotfix KB2637197 has already installed.

Is it problem with MS VSS hardwire provider?

Support case ID - # 00206482

Thanks

[veremin]

Under certain circumstances you might get the said errors due to:

• Lack of hard disk space required for snapshot allocation. It’s recommended to have at least 20% free space on storage.
• Lack of hardware VSS provider. Or it has to do with hardware provider working or being installed wrongly.

Additionally, has our support team already commented on this issue or the case is still under investigation?

Thanks.

[Borsh]

Hello, Vladimir!
Yes, VEEAM support has already contacted with me.
I think it's lack of hardware VSS provider, because we have enough disk space (more than 70%).
In our case, MS VSS hardwire provider is using.
Can i use another VSS hardwire provider if backup proxies are on hyper-v hosts? For example, our SAN storage is HDS AMS 2300, so HDS VSS provider.

Thanks

[foggy]

Can i use another VSS hardwire provider if backup proxies are on hyper-v hosts? For example, our SAN storage is HDS AMS 2300, so HDS VSS provider.

Of course, it is recommended that hardware VSS provider is provided by the SAN vendor.

[Borsh]

But, If i know, SAN hardwire VSS provider crates snapshot on SAN storage level, is not it?

[Vitaliy S.]

Snapshot will be taken on your Hyper-V server and based on the configuration, it will either be transferred to an offhost proxy or will remain on the production Hyper-V server. Please take a look at our User Guide (pages 12-13) for further reading.

[Borsh]

I've installed VSS hardwire provider HDS AMS.
Replication job finished with warning:
5/20/2013 3:01:23 PM :: Unable to create snapshot (Hitachi VSS Hardware Provider) (mode: Veeam application-aware processing). Details: Unknown status of async operation
Vss error: '0x80042306'
--tr:Failed to create VSS snapshot.
--tr:Failed to perform pre-backup tasks.

[Vitaliy S.]

Igor, please contact our support team with all technical issues as it is explained with you click New Topic. Thanks!

[retrograde_pak]

We have the following setup:
Hyper V Cluster
OS: Windows Server 2008 R2
Servers: 2xHP Proliant DL380 G7
Storage: HP P2000 G3
Veeam: V 6.5 Patch 3

We want to have reverse-incremental backups of our VMs. Issue is that as long as all VMs are on a single host (host 1 or host 2), the veeam backup does not fail but if we distribute the VMs between host 1 and 2 then intermittently during the backup, one of host randonmnly will loose connection to eth CSV with typically errors 5120 and 5142. We have to restart the affected host and only then it rejoins in the Cluster

[veremin]

You have been merged to the existing discussion, so please take a look at the answers provided above that might help you to understand the causes of errors 5120, 5142.

Thanks.

[Borsh]

As a result, the problem has been that Jumbo frame was not enabled in the Cisco kernel switch. After it's was enabled - hosts does not lose connection to CSV when it"s used MS software provider or Hitach hardware provider.

[foggy]

Igor, thanks a lot for updating the thread on the results of your investigation!