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Netbackup and 3PAR

Level 3

Hi all

I have a Netbackup 7.7.1 server backing up VMs from 3PAR LUNs and EVA LUNs.
The VM backup job was running smoothley.

Suddenly the job started to fail for all VMs on the 3PAR. (EVA is fine).
It also writes very slowly before it fails. the speed is clearly SLOW

Is there any known compatibility issues ?

attached is one of the error logs.


Level 5

They are no known issues with 3PAR.

Can you try disabling Accelerator and see if the backup works?

Also you should look at upgrade to at least 7.7.3.

They are 3rd party tools you can use for testing read performance on a LUN:

If you are using multiple paths, then disable it and try each path until you find a problem path.  Work with 3PAR to identify the issue with the SAN configuration.

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A simple to use but with good and clever options for disk file system IO speed profiling is:

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If your restore is going to VMFS datastore LUN on 3PAR then the issue cannot possibly be an incompatibility between NetBackup and the 3PAR - because NetBackup doesn't write directly to the LUNs, the writes are performed by the VMware VDDK, and even this should be LUN agnostic - the only possibility is an issue with the server OS of the NetBackup for VMware host (i.e. the Media Server or Enterprise Client) performing the restore - or between the server HBA (model, firmware, driver) and the SAN switch(es) and 3PAR target ports.

IMO, you might be better off talking with your storage team.

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tip #1:   advanced storage arrays typically have "modes" for LUNs.  i.e. a LUN can be a Solaris mode LUN, or a Windows mode LUN or a Linux mode LUN, and some arrays even have ESXi mode LUNs (but usually a Linux mode LUN is enough for an ESXi host).

tip #2:  not all versions of the VDDK in not all versions of NetBackup support multi-pathing - also written as only some versions of some VDDK on some OS for some versions of NetBackup support multi-pathing.  And even then you may have to install the correct multi-pathing DSM to support ALUA.  If you don't know exactly whether or exactly whether not any of this applies to you then you cannot rule any of it out, and so you really do need to talk to your storage admin team.

tip #3:  multi-pathing for NetBackup for VMware host should either:

a) correctly configured


b) correctly not-configured check the NetBackup documentation.

What this means is:

a) you can use multi-pathing


b) you should not be attempting to use multi-pathing.

If you do not know the exact correct answer for your combinations of versions hardware (servers, HBAs, switches, storage arrays) and combinations of versions of software (storage array, HBA, firmware, driver. OS, SAN switch fabric OS, ESXi operating system version, DSM version, multi-path driver verison, backup host OS version, etc)... then you need to do your research until you are 100% certain that you can use multi-pathing or 100% certain that you should not use multi-pathing.  They are no grey areas.  This is a black and white topic.

tip #4:  in storage array terms... treat the NetBackup for VMware host (i.e. the Media Server or the Enterprise Client) as if it were just another ESXi host in the ESXi cluster.  (assuming multi-pathign is correctly configured or correctly not-configured).