Networker

[Networker] Cloning performance - Quantum VTL to LTO4 tape

2010-01-08 22:45:20
Subject: [Networker] Cloning performance - Quantum VTL to LTO4 tape
From: 0grobinson <networker-forum AT BACKUPCENTRAL DOT COM>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Fri, 8 Jan 2010 06:54:10 -0500
I am cloning from a Quantum DXI7500 to three LTO4 drives using three instances 
of nsrclone running across two storage nodes but my throughput is averaging 
approximately 40-MBPS per drive.

Networker Console and the DXI7500 console show regular bursts of 120-MBPS and 
the speed fluctuates between 30-MBPS up to 120-MBPS, but the DXI console shows 
10-20 second delays with 0-MBPS being read and the virtual tape drive reports 
its status as moving, I am assuming because its repositioning to the beginning 
of the next saveset?

So my question is what sort of speeds are others seeing for cloning to LTO4 
drives from a VTL? And is the 10-20 second delay I am seeing due to nsrclone 
repositioning the virtual tape drive to the beginning of the next saveset?

Any tips on improving cloning throughput greatly appreciated, thanks.

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