Forum Discussion

devans3428's avatar
devans3428
Level 4
12 years ago

backups causing server to drop network packets eventually lead to network failure

First a little history...  I just migrated netbackup 7.1.03 master/media from solaris10 sparc V440 to Redhat 6.4 netbackup 7.1.0.3 on hardware Dell PowerEdge R720xd.   I have a mixture of clients wit...
Backing Up
Backup and Recovery
NetBackup
Performance
Solaris
Troubleshooting
  • devans3428's avatar
    devans3428
    12 years ago

    Thanks Nicolai.... I have increased the NUMBER_DATA_BUFFERS_DISK and  NUMBER_DATA_BUFFERS TO 128 for starters.... I have moved the backups to a isolated nic from the public traffic on the client.   I still see minimal increase in ping times on the backup nic and also from time to time i may miss a packet.  However, the network continues to function from the public and backup nic.   So in conclusion, the fix was to lower the SIZE_DATA_BUFFERS_DISK to minimum 262144.  I will mark this one resolved after a week of doing backups to ensure nothing else creeps up.  As a side note i did increase tcp sliding window on the client solaris but i dont believe there was any affect on increasing the window.

     

    Thanks

Nicolai's avatar
Nicolai
Moderator
12 years ago

Thanks for the update. From my experiance 262144 will do just fine, just increase NUMBER_DATA_BUFFERS to 128 or 256 and you will see a much better performance. 

From a test I did longe time ago:

Before tuning: 19MB/sec (default values)

Second tuning attempt: 49MB/sec (using 128K block size, 64 buffers)

Final result: 129MB/sec  (using 128K block size and 256 buffers)

It's the NUMBER_DATA_BUFFERS that does the magic :-)