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February 25th, 2020 04:00
"No matching devices" when trying to restore with nsrndmp_recover
Hi Pro's,
I have some challenging task to restore some old data from 2006.
The equipment has been "idle" for more than ten years but the backup server (Solaris 10) is intact together with a storage node (Windows 2003). The old tape library had to be replaced but I could not find a new library that could be connected to the backup server itself (as the old one was) due to it is DIFF SCSI and the new tape library had LVD SCSI. I then connected the new library to the storage-node that had the LVD SCSI and configured the library itself together with its two tape drives in networker.
I now started to locate the data and tried to initiate a restore but I get an error…
mminfo -s bckserver -avr client,name,ssid,cloneid,sumsize,ssflags,pool 06K411
client name ssid clone id size ssflags pool
filer1 /vol/vol1/.snapshot/backup/data 2492811718 1167411605 9576 MB vrENF STGpool20
Restore command:
nsrndmp_recover -s bckserver -c filer1 -J storagenode1 -S 2492811718 -m /vol/restore_vol /vol/vol1/.snapshot/backup/data
42787:nsrndmp_recover:ssid'2492811718': Performing recover from NDMP type of device
5767:nsrndmp_recover:ssid'2492811718': NSR server bckserver: no matching devices on `storagenode1’
5768:nsrndmp_recover:ssid'2492811718': waiting 30 seconds then retrying...
I have added the two tape drives as target devices to the media pool “STGpool20”
Any idea why this doesn’t work? Does the tape library need to be directly connected to the backupserver or is there somthing else I am missing?
bingo.1
2.4K Posts
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February 26th, 2020 02:00
BTW - the were in fact SCSI converter/bridges available to connect differential with single-ended/LVD SCSI buses. You may want to search ebay for one them.
With respect to NDMP backups - the Network Data Management Protocol - very course - defined 2 standards:
- the control mechanism for the devices and
- the data format itself
The 'N' flag indicates that this backup is of type NDMP indicating that this backup is a pure NDMP backup which must have been written by a NDMP tape drive. Consequently, you must reconfigure your jukebox drives as NDMP devices because only NDMP drivers will be able to read/write NDMP data.
So your obvious problem is that your tape devices are not of the type 'NDMP'. And of course these drives must be connected to a NDMP filer because only he can handle NDMP devices properly.
The jukebox type (SCSI or NDMP) does select how the jukebox is controlled. I think that even for the vast majority of mixed scenarios, the jukebox has been configured as a standard SCSI jukebox. However, the jukebox type does not affect the data format for the tape drive/volume.