Networker

Re: [Networker] cloning save sets to LTO4 vs LTO2

2008-05-13 12:14:19
Subject: Re: [Networker] cloning save sets to LTO4 vs LTO2
From: Francis Swasey <Frank.Swasey AT UVM DOT EDU>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Tue, 13 May 2008 12:05:57 -0400
I have a similar setup. We have four 8TB partitions and two LTO-4 tape drives on an IBM 3650 (running RHEL 4) and I see (as reported by NMC) speeds up to 140MB/s. The LTO-4 tape drives are point-to-point attached to QLogic 4Gb dual port HBA's. We have two of the HBA's and connect one port to a tape drive and one port to the Nexsan SATABeast controller on each one.
So, as long as your storage node/server has enough cpu power to push the
data and your disk devices can read that fast, yes, you'll see better
throughput with the LTO-4 drives.
Frank

On 5/13/08 11:07 AM, Jon Fraley wrote:
Networker 7.3.3

We currently do D2D2T.  We have three 2TB partitions we back up to. We
then clone the Save Sets to tape in parallel from the three partitions
to three separate LTO2 drives.  We probably average around 45MB/s to
each drive.  We are planning on replacing our storage this fall and one
vendor has suggested we replace our Adic i2000 (6 LTO2 drives, nearly 4
years old, but rock solid) with a smaller library with LTO4 drives on
the thought of having more through put to the drives.
Since cloning save sets is single threaded to the drive, will I see a
significant increase in through put with LTO4 drives?  We are planning
to increase our disk backup space from 6TB to at least 25TB.
Thanks -- Jon

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Frank Swasey                    | http://www.uvm.edu/~fcs
Sr Systems Administrator        | Always remember: You are UNIQUE,
University of Vermont           |    just like everyone else.
  "I am not young enough to know everything." - Oscar Wilde (1854-1900)

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