Cloning Performance Question 1

[Till]

Hi @ll

We're using a AFTD (on EMC² DMX) to back up slower file servers with many small files and use staging because the write speed would not be high enough for our LTO III drives.

Staging of the savesets however works fine but I am disappointed about the write performance to the LTO III drives.
It varies between 8 MByte/s and 20 MByte/s sometimes which is too poor for the LTO's as well.

Does anybody of you know a way to tune this or to improve the performance of this process ?

We're using NW 7.4.2 on Win2K3 by the way

Thanks in advance

cheers Till

 

[a060463xyz]

You should check your Tape Drivers, EMC recommends the tape.sys from Microsoft or the nonexclusive IBM Atape drivers.
HP or Certance Drivers are not recommended.
Format the Filesystem of the Advanced Disk Device with a blocksize of 64 kb.
How ist your Tape drive attached ?
If you use Fibrechannel separate Disk and Tape to different hbas if possible.

 

[Till]

Thank you a060463xyz

These were some helpful ideas because we were in fact using hp drivers under Windows 2003.
The LTO's are SCSI and connected to a Fibre Card within a NEO 4000 Jukebox
It bugs me that LAN backups to these LTP's are much faster than from a AFTD..

cheers Till

 

[605]

You can also check for the optimal tape drive speed using NetWorker's 'bigasm' directive. For details, please see the 'NetWorker Performance Tuning Guide'. It will give an an idea how fast your tape drive could actually write.