Free space on datastore.

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[MERGED] Why is space required on the datastore to be backed

Veeam Logoby MelD52 » Tue Sep 19, 2017 6:22 pm


The host to be backed up is Vmware ESXi 6.0 hosting 4 VMs: 2 Linux and 2 Windows.

I am trying to back up one Windows VM.

VEAAM is running on a physical Windows 7 Pro machine on the network. The backup drive NAS with 5.2TB free space which is visible as a Windows shared folder.

When I start the backup I get the error: "Skipping VM Processing due to insufficient free disk space on datastore datastore1."

We know that the space is low on that datastore. That is why we want to back it up - so we can safely re-configure the space.

It seems we are trapped. Why does Veeam need space available on the datastore to be backed up? Is there any way around this?

Thanks in advance for any help.

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Re: Free space on datastore.

Veeam Logoby Vitaliy S. » Tue Sep 19, 2017 7:36 pm

Mel, please take a look at Dmitry's post on the previous page for the answer. Thanks!
Vitaliy S.
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[MERGED] Mandatory Free space size at Datastore of the sourc

Veeam Logoby HenokD » Wed Oct 11, 2017 11:13 am

a Veeam novice here.. We subcontracted the Veeam Backup & Recovery portion of a project to another company.. Below are the details of the infrastructure and the current issue requiring guidance:

VMware vCenter Server v 5.5.0
Veeam Backup & Replication v

DR site:
Only one host; Drive type: None-SSD; Capacity: 5.45TB; Free space: 4.81TB [already has 9 App VM replicas]

Data center site: 2 hosts; one for DB VMs, one for App VMs
For host-1, has 9 App VMs; disk backup, tape backup & replication all done... No issues there..
For host-2,
Physical server internal storage has eight 800GB SSD in Raid 1+0; Drive type: SSD; Capacity: 2.9TB; Free space: 1.52TB
Hosting 1 production SQL DB VM ; Provision space: 2.06TB; Used space:1.38TB

Plan: Backup & replicate the production SQL DB VM to DR
Issue reported by subcontractor: Free space available in repository of the host of the production SQL DB VM is not enough for the VM snapshot to be taken during the snapshot process including the space required for corresponding tasks for the replication process. He says if the replication job is started and if there is issue on the job process completion [i.e. during taking snapshot, creating backup, delta files, compression, data moving, decompress, write, commit vm snapshot, consolidation..], there is a chance that the source production SQl DB VM might fail...
He suggests that the DB size be optimized/reduced [as the actual DB size is much smaller... which requires support with another vendor supporting the DB]
OR he asks that source host datastore be increased by adding two 800GB SSDs.

Kindly help to understand if this is a correct assessment by the subcontractor.
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Re: Mandatory Free space size at Datastore of the source hos

Veeam Logoby HenokD » Fri Oct 13, 2017 11:41 am

In short, if you have an SQL DB VM of size 1.38TB and if its host has free space of 1.52TB, will an application aware replication job for the SQL DB VM to another host's datastore complete successfully?
If not, will the attempt affect the condition of the source SQL DB VM?
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Re: Free space on datastore.

Veeam Logoby foggy » Fri Oct 13, 2017 3:24 pm

Henok, please review this thread for considerations regarding datastore space requirements. Thanks.
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