Slow backups with NBU 18.104.22.168 and MSL8096
- Clustered master server with 2 Linux nodes running NBU 22.214.171.124.
- Two Windows Server 2008 R2 media servers on HP ProLiant DL380 G5 (2* E5410 @ 2.33GHz & 24GB RAM each)
- HP MSL8096 tape library with 3 drives (multipath connected, latest drive and library firmware installed), LTO-5 tapes only.
- A mix of Windows 2003 R2 and Windows 2008 R2 clients (VM's and physical systems - approx. 200+ servers). All clients are on NBU Client v126.96.36.199. Physical servers are backed up over the 1GB network. VM's over fiber.
Conducting tests using HP's Library and Tape tools (installed on one of the media servers) it shows the MSL8096 drives are able to backup 30GB of data up to an average speed of approx 310MB/s (unencrypted) and up to 260MB/s (with 2.1 encryption).
Though trying to backup physical systems over the 1GB network this remains between a disappointing 5 ~ 20MB/s. Even if one single backup job is started manually without any other jobs running this does not come close to the magic threshold of 50MB/s. Backing up shares with NDMP on our NetApp sometimes reaches the 40MB/s but still not enough.
Several of our config files with the following values (if applicable):
NUMBER_DATA_BUFFERS = 256
NUMBER_DATA_BUFFERS_DISK = 64
SIZE_DATA_BUFFERS = 524288
SIZE_DATA_BUFFERS_DISK = 524288
SIZE_DATA_BUFFERS_NDMP = 524288
It's very time consuming to get this resolved and quite honestly I'm lost where to look.
Any assistance is appreciated.
Thanks in advance!