Hi Will -
I'm interested in this also.
I don't claim to have a great methodology, but I approached this with a count of how many tape drives are busy, at 15 minute intervals. This kind of gives you the inverse - if you assume that if all the tapes were 100% writing tapes, you'd have no more easy capacity to put to work.
Of course, you could modify buffer settings, and implement snapshots, &etc., but if all the tape drives are working, they are all working.
If you have a "simple" NBU environment, where all the data goes over the LAN to the media server, than obviously ethernet is a limiting factor. See http://www.dell.com/downloads/global/power/ps2q07-50060437-Intel.pdf -- specifically the diagram Throughput bottleneck in typical enterprise backup and restore configuration
So, 10 gb/sec works out toreal world 700 MB/sec, right ?
There are all sorts of parameters and caveats, frame size, and so on, and you're probably going to have to share some links of your network with other people… but even if you had everything else working perfect, you're not really able to drive 10 tape drives flat out, are you ? Of course, for most people, "everything else" isn't working perfectly.
Interested in other folks' thoughts.
Ben Mealey
US Library of Congress
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Will Tucker
Sent: Tuesday, January 25, 2011 2:47 PM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] How Much Data Can Be Backed Up
All,
How do you determine how much data that can be backed up in your environments? I have NetBackup 6.5.3 with 10 tape drives and 5 media servers in a Windows environment. Thank you.
Will Tucker | Storage Administrator
Enterprise Technology Services
Manhattan Associates, Inc.
Direct +1 678.597.6644
Phone +1 770.955.7070
Fax +1 814.295.9676
Mobile +1 770.490.5404
wtucker AT manh DOT com
http://www.manh.com/
_____________________________________________
The Supply Chain People®
Manhattan Associates
From: Will Tucker
Sent: Tuesday, January 25, 2011 2:45 PM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: Media Servers Per Tape Drive Ratio
All,
How do you determine how many media servers per tape drive in your environments? I have 10 LTO3 tape drives and have been using 2 media servers per tape drive. Thank you.
Will Tucker | Storage Administrator
Enterprise Technology Services
Manhattan Associates, Inc.
Direct +1 678.597.6644
Phone +1 770.955.7070
Fax +1 814.295.9676
Mobile +1 770.490.5404
wtucker AT manh DOT com
http://www.manh.com/
_____________________________________________
The Supply Chain People®
Manhattan Associates
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of WEAVER, Simon (external)
Sent: Tuesday, January 25, 2011 1:55 PM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Size buffers / Performance Tune on Ex2k3 with LTO4
All
Just a quick question, but I used some default NetBackup settings to tune Exchange backups and restores.
If I move to a different library with LTO4 (rather than LTO3), do I need to reconfigure the settings?
Windows 2003 SAN Media Exchange, with Master Win2k3 SP2
Regards
Simon
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