Vendor:??

OS:??

Hardware:??

NAS Version:??

Let us know the details!

EMC Celerra NS20

os type "DartOS" 

os version "EMC Celerra File Server.T.5.6.42.501"

Master/Media Server: Windows 2003 SP2 x86

Did you find anything in the Windows Event Log?

You porbably think about this document..

http://seer.entsupport.symantec.com/docs/279687.htm

But os version on Celerra is much older.

marekk

But can u able to find any thing in the Event Log and  bptm logs !

ltid debug logs shows this:

20:33:20.741 [3520.3524] <4> LtidProcCmd: Pid=476, Data.Pid=476, Type=204, Param1=0, Param2=0, LongParam=0
20:33:20.741 [3520.3524] <6> DownDrivePath: DOWNing path c80t0l0 for HP.ULTRIUM4-SCSI.000 on host ********
20:33:20.741 [3520.3524] <6> WriteEntry: Updating drive HP.ULTRIUM4-SCSI.000 at path c80t0l0 on attach host server_2.***.***
20:33:20.773 [3520.3524] <16> emmlib_NdmpUserIdQuery: (0) queryNdmpCredentials failed, emmError = 2000003, nbError = 0
20:33:20.788 [3520.3524] <16> DownDrivePath: (-) Translating EMM_ERROR_FilerNotExist(2000003) to 328 in the device management context
20:33:20.788 [3520.3524] <6> DownDrivePath: failed retrieving alternative path for drive HP.ULTRIUM4-SCSI.000. retval = 328

It's strange becasue Creditenials are configured properly, I can verify and probe Cellera host.. but for example after 30 minutes after backup NDMP path is turned off and next backup ends with errors because of no drives available. I have to manually change drive state to up to turn on ndmp path.

bptm doesnt show any errors.

marekk

Event Application logs for AVR shows this:

ndmp_public_session_create() failed: Unable to retrieve authentication challenge from NDMP server

Altho' we don't utilise EMC filers, there certainly appears to be some authentication issue here?

Have trawled thru' the Knowledgebase etc tho' all I could find, that hasn't already been suggested, is the following posting which may be of use:

NDMP ERROR

Have you made any changes recently that may have affected this backup, or is it something that has never worked?