Networker

Re: [Networker] 7500 Mb/s on 10 GbE!

2007-10-21 15:51:48
Subject: Re: [Networker] 7500 Mb/s on 10 GbE!
From: Curtis Preston <cpreston AT GLASSHOUSE DOT COM>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Sun, 21 Oct 2007 15:48:35 -0400
His math is correct.  The original story is a user who is getting 7500
Mb/s (~900 MB/s), which would require 10 clients running @ 750 Mb/s, or
95 clients @ 90 Mb/s, or some combination thereof.

What I think he's saying is that most customers don't need this kind of
speed.  I agree and disagree.  I'll agree that most don't need 900 MB/s
to get their backups done in their backup window.  However, if you've
got 4 LTO-4 tape drives, you do need 900 MB/s to fully utilize them.

I also have plenty of customers who do indeed need this kind of
bandwidth (and more) to get their backups done within their respective
windows.  When you've got 50, 100, or 1000 TB to back up each night, you
need to drive every piece of hardware to its limit, and with 7500 Mb/s
(~900 MB/s), I can back up just over 3 TB an hour per backup
server/storage node.  The fact that we've now seen at least one person
do it (who has graciously shared HOW he did it) is what I'm excited
about.

What I'm NOW curious about is which is currently cheaper: two FC ports
or one 10 GbE port?  

---
W. Curtis Preston
Backup Blog @ www.backupcentral.com
VP Data Protection, GlassHouse Technologies 

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Dag Nygren
Sent: Sunday, October 21, 2007 1:29 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] 7500 Mb/s on 10 GbE!

> Because, in how many instances would you have such a configuration
that 
> could push that sort of bandwidth?  Even if you had clients on gigabit

> pushing say 80Mb/s each, you would still need ~95 clients
simultaneously 
> sustaining that throughput to reach 7500Mb/s.  And thats off real 
> storage, not of a synthetic benchmark.


I think you are misreading Mb/s as MB/s....

Best
Dag

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