64 TB VSS snapshot limit in Windows 2016

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64 TB VSS snapshot limit in Windows 2016

Veeam Logoby enoch » Mon Sep 05, 2016 7:29 am

Hi all,

Maybe the wrong forum, but does anyone know if it's possible with Windows 2016 to have greater volumes than 64 TB in Windows and still be able to VSS on running virtual machines in Hyper-V?

https://support.microsoft.com/en-us/kb/2967756
enoch
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Re: 64 TB VSS snapshot limit in Windows 2016

Veeam Logoby Delo123 » Mon Sep 05, 2016 8:51 am

I don't believe this is going to change.

https://technet.microsoft.com/en-us/win ... erver-2016

Having more than 64TB on a single VM sounds scary anyway ;)
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Re: 64 TB VSS snapshot limit in Windows 2016

Veeam Logoby enoch » Mon Sep 05, 2016 9:01 am

This problem is not only if you have a VM with more than 64 TB, the problem is that it's not possible to make a VSS snapshot on a phycical Hyper-V server which have a volume that is larger than 64 TB.

The Hyper-V server could on this 64TB volume have 100's of VM's, but the "problem" (up to windows 2012r2) is limit on the volume.
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Re: 64 TB VSS snapshot limit in Windows 2016

Veeam Logoby Delo123 » Mon Sep 05, 2016 10:54 am

Yes, that is why you can have nearly unlimited (I think) volumes each 64TB large, you just have to make sure you thin provision them in storage spaces... We have 10x62TB thin provisioned volumes on "only" 480TB of storage to overcome VSS limit
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Re: 64 TB VSS snapshot limit in Windows 2016

Veeam Logoby nmdange » Tue Sep 06, 2016 12:46 am 1 person likes this post

Since VM backups using the new RCT (Resilient Change Tracking) will no longer require doing a VSS snapshot on the host level, you should be able to have a host volume larger than 64TB and still do backups. However, I think each VM would still be limited to 64tb.
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Re: 64 TB VSS snapshot limit in Windows 2016

Veeam Logoby foggy » Wed Sep 07, 2016 2:01 pm 1 person likes this post

nmdange is spot on. The limit is still there, however, VSS snapshots will not be used during onhost backup from Windows Server 2016, so you can have larger volumes in this case.
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Re: 64 TB VSS snapshot limit in Windows 2016

Veeam Logoby enoch » Sun Sep 11, 2016 2:43 pm

Great news, does Veeam support Windows 2016 RCT or do we need to wait until Veeam 9,5?
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Re: 64 TB VSS snapshot limit in Windows 2016

Veeam Logoby Vitaliy S. » Mon Sep 12, 2016 8:53 am 1 person likes this post

Yes, you need to wait till Veeam B&R v9.5 comes out to start using Windows 2016 RCT (Resilient Change Tracking) engine.
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