Networker

Re: [Networker] Drive write performance

2004-10-08 15:10:56
Subject: Re: [Networker] Drive write performance
From: "Reed, Ted G II [ITS]" <ted.reed AT MAIL.SPRINT DOT COM>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Fri, 8 Oct 2004 14:12:35 -0500
We tell our clients that 100Mb == 8MB/sec.....though we can see more with 
compression and the like.  

And we also make sure they know that 1000Mb (GigE) != 80MB/sec....more like 
30-40MB/sec, maybe a touch more with really aggressive TCP/IP optimizations.  
But 400Mb performance out of a 1000Mb card is not at all unusual.  [Random 
observation, off-topic]

-----Original Message-----
From: Legato NetWorker discussion
[mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]On Behalf Of Davina Treiber
Sent: Friday, October 08, 2004 1:42 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Drive write performance


Somen Chanda wrote:
> We have a 100MB/sec network which is used for data and backup. Our backup
> server is a Sun 280R running Solaris8 and has 2GB RAM and a similar config
> storage node. We have LTO1 drives in a ADIC Scalar100 library, We currently
> do not see backups moving more than 11MB/sec per drive.
>

You need to know the difference between b and B. b is bits and B is
bytes. A 100 "meg" network is usually bits. 11MB/s is about what you
should expect.

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