| Author |
 Topic  |
|
|
protech
Old Timer
United Kingdom
303 Posts
Status: offline |
 Posted - 06/11/2012 : 12:28:17 PM
|
Hi
We have a DPM 2010 Server that backs up (when it works) 6 virtual machines and 2 hyper-v core Servers.
The issue we have is, that for reasons we can't figure, the DPM Server seems to loose contact with the Servers is should be backing up.
We can test the Server-to-DPM agent connectivity and get the 'OK' response. Then leave the backup jobs to run overnight, only to find in the morning that they did not run because DPM 2010 advises that the
"agent is not reachable". Sometimes if we ask DPM to try and reconnect using "Refresh Information" it will succeed with an "OK", other times it will come back as "unavailable".
The network infrastructure is fine, DNS is fine, firewalls are turned off on all Servers yet we still can't understand why we get random loss of agent connectivity.
Anyone any ideas?
Thanks
|
|
|
JeffWouters
Here To Stay
Netherlands
147 Posts
Status: offline |
Posted - 06/11/2012 : 12:59:33 PM
|
| Do you seprate your backup traffic from your normal traffic? In my exprience, the symptom you describe will be seen when the backup traffic blocks out all other traffic on the NIC... |
Greetsz,
Jeff. |
 |
|
|
joe_elway
Honorable But Hopeless Addict
Ireland
7397 Posts
Status: offline |
|
|
wobble_wobble
Honorable But Hopeless Addict
Ireland
4517 Posts
Status: offline |
Posted - 06/12/2012 : 01:45:58 AM
|
Couple of things to check.
Firewalls enabled on the OS, both DPM and the target.
Are the targets on the same LAN or is there a firewall/ router between them?
When it fails, does it fail on all?
If so, try moving the DPM server to a different port on the switch.
|
Joe
After everything that has happened during the month of Jan 07, I do believe that pigs fly backwards!
http://whatismyv6.com/ |
|
|
|
protech
Old Timer
United Kingdom
303 Posts
Status: offline |
Posted - 06/19/2012 : 10:02:32 AM
|
Before we change to use a separate LAN for the backup, I should point out that DPM seems to loose connectivity to the agents on the Servers even when there is nothing happening on the network ie no backups running. The DPM Server can happily ping/name resolve the Servers with agents on.
Is there any log file on DPM that we can look at to see more info as to what the issue may be? The standard error message is not to useful.. |
|
|
|
joe_elway
Honorable But Hopeless Addict
Ireland
7397 Posts
Status: offline |
|
|
protech
Old Timer
United Kingdom
303 Posts
Status: offline |
Posted - 06/20/2012 : 1:01:38 PM
|
Hi,
There is no cluster as such. Just one physical server running 2008R2 and DPM and two physical Servers running 2008R2 Core + hyper-v.
Each of the hyper-v hosts 'host' 3 completely independent VM's. The error is Data Protection Manager Error ID 300 - ie check your IPSec (turned off everywhere), Firewall (turned off everywhere) and RPC is running (which it is). We have this same setup running elsewhere without any issue.
Beyond that the loss of connectivity seems totally random.
Any suggestions?
|
|
|
|
protech
Old Timer
United Kingdom
303 Posts
Status: offline |
Posted - 07/05/2012 : 09:35:58 AM
|
| Turned out issue was cause by a screwed up DNS Server. So basically name resolution was only working 50% of the time. |
|
|
| |
Topic |
|
DPM 2010 and it's agent issue.
