Jon Craig wrote:
> On Mon, Aug 17, 2009 at 5:38 PM, Les Mikesell<lesmikesell AT gmail DOT com>
> wrote:
>> Jeremy Mann wrote:
>
>>> I'm watching a live output of Ganglia showing network usage while the
>>> backups are going. Also simple math.. I just finished one full backup,
>>> 16
>>> GB in 143 minutes. That's simply unacceptable for a full backup.
>>
>
> That equates to 21 MB/second backup rate.  The speed on the network is
> irrelevant because that is affected by which files actually get
> transfered.  The backup rate is affected by the time to calculate
> checksums on the server and the client and if you have compression
> turned on for your pool files then it includes the time to compress /
> decompress files to/from the pool (hash collisions require complete
> file comparison).  What is your processor doing during this activity.
> Remember that each backup session is single threaded so your speed
> will be gated by the speed of a single processor.

Huh? 21MB/s would give me 100MB (megabytes) every 5 seconds.

I think you are confusing MB (megabytes) and Mb (megabits) per second.
21Mb is right (about 2 MB - megabytes per second) which is what I saw for
this particular server.


-- 
Jeremy Mann
jeremy AT biochem.uthscsa DOT edu

University of Texas Health Science Center
Bioinformatics Core Facility
http://www.bioinformatics.uthscsa.edu
Phone: (210) 567-2672


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