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kbing
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problem backing up VM w/RDM disk

Post by kbing » Feb 10, 2010 4:00 pm

I have a VM that is running the OS on a VM virtual hard disk (.vmdk) and the second and third disk setup are physical RDM's. We are running vSphere 4 update1.

I want to backup the VM OS but not the RDM's with Veeam Backup but get an error because it is trying to backup the -rdmp.vmdk file. I believe this is the file that VMware uses to map to the LUN.

Anyone know how to accomplish the above backup without getting the error's below?

Verifying changed block tracking... Disk "Hard disk 2" has incorrect changed block tracking configuration. Disk "Hard disk 3" has incorrect changed block tracking configuration. One or more VM disks have incorrect changed block tracking configuration. To resolve this, open VMware vSphere Client, right-click the VM, choose Edit Settings, Options tab, select General, click Configuration Parameters, and set all entries with ‘ctkEnabled’ substring to false. Veeam Backup will then automatically re-enable changed block tracking with the correct settings during the next job run. Backing up file "[emc_lun60_vmfs_lun2] D01EXCHANGE04/D01EXCHANGE04_2-rdmp.vmdk" BackupDisk failed Client error: Failed to open VDDK disk [[emc_lun60_vmfs_lun2] D01EXCHANGE04/D01EXCHANGE04_2.vmdk] ( is read-only mode - [true] ) Failed to open VMDK. Logon attempt with parameters [VC/ESX: [d01vcenter];Port: 443;Login: [forum\kbing_admin];VMX Spec: [moref=vm-896];Snapshot mor: [snapshot-1036];Transports: [san]] failed because of the following errors: Server error: End of file

Gostev
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Re: problem backing up VM w/RDM disk

Post by Gostev » Feb 10, 2010 4:14 pm

Hello, as per System Requirements physical RDMs are not supported by Veeam Backup.
http://www.veeam.com/files/release_note ... _notes.pdf
All types and versions of virtual hardware are supported, except independent and physical RDM disks (virtual RDM disks are supported). You can use disk exclusion functionality to exclude some of the unsupported disks from backup/replication.
This limitation is not specific to our products, you cannot perform pRDM backups with any image level backup solution because VMware does not support snapshotting pRDM disks (technically, this is simply impossible to do because of what pRDM is and how VMware snapshots work).

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Re: problem backing up VM w/RDM disk

Post by mdornfeld » Feb 10, 2010 6:31 pm

KBing,
As Anton somewhat mentioned, you could try excluding the physical disks using the "Exclude" functionality when you setup the backup job.

That should accomplish what you're after.

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Re: problem backing up VM w/RDM disk

Post by BearHuntr » Feb 11, 2010 6:40 pm

Unfortunately, the handling of VMs with Physical RDMs attached seems to have changed for the worse in 4.1. When I was using 3.x, it would just ignore the RDM and backup only the virtual drives with no errors. No special setup was needed. Now, in 4.1 you have to set an exclude for the RDM disks or it will fail. Plus, since the exclude can not be singled out for just one VM in a job, any VMs with RDMs need to be in a completely separate job from VMs without RDMs. It's very frustrating.

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Re: problem backing up VM w/RDM disk

Post by tsightler » Feb 11, 2010 6:43 pm

I believe this is actually a change from VMware. I think that VCB automatically skipped pRDM's, while vStorage API does not. I could be mistaken on this though.

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Re: problem backing up VM w/RDM disk

Post by BearHuntr » Feb 11, 2010 7:06 pm

tsightler wrote:I believe this is actually a change from VMware. I think that VCB automatically skipped pRDM's, while vStorage API does not. I could be mistaken on this though.
That would make sense, however, the limitations on disk exclusions is all Veeam.

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Re: problem backing up VM w/RDM disk

Post by Gostev » Feb 11, 2010 7:52 pm

BearHuntr wrote:Unfortunately, the handling of VMs with Physical RDMs attached seems to have changed for the worse in 4.1. When I was using 3.x, it would just ignore the RDM and backup only the virtual drives with no errors. No special setup was needed.
Still the case with 4.1 (but only in VCB mode) :wink:
BearHuntr wrote: Plus, since the exclude can not be singled out for just one VM in a job, any VMs with RDMs need to be in a completely separate job from VMs without RDMs. It's very frustrating.
We are working on it.

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Re: problem backing up VM w/RDM disk

Post by BearHuntr » Feb 12, 2010 3:08 pm

Gostev wrote:We are working on it.
Thank you!!!

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