Thanks Yaron!

Anyone else out there using T1 or T2 processor systems with LTO-4(or
T10000) drives?  These extrapolated numbers seem reasonable, but just
wondering if anyone has real world experience with the setup.  If this
is the case then I may have to look towards an M3000 or M4000 server for
the propose of cloning.  

Thanks!

Joel

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Yaron Zabary
Sent: Thursday, October 15, 2009 10:58 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Sun Hardware

Joel Fisher wrote:
> Hey Yaron...  apparently I'm unable to articulate my question
properly.
> Sorry for that.
> 
> I have a T5220(8x1.2Ghz/16GB) as my networker server and at
> T2000(4x1.2Ghz/16GB) as a storage node.  I'm getting ready to replace
my
> tape environment, and I don't currently have anything that moves data
as
> quickly as the LTO-4 and LTO-5 drives do.  So, I'm just trying to
figure
> out if I need to add another storage node to the environment.
> 
> What you've mentioned about a 1.6 not being able to keep a compress
> LTO-4 running or might have problems streaming an uncompressed LTO-5
> obviously concerns me a bit.

    Currently I have a staging process which runs at 2.6% according to 
top. It drives an LTO-3 drive at 60MBps (according to 'zpool status 1').

2.6% on a 6-core (24 threads) T1000 is ~62% of a core. Extrapolating 
this gives ~95MBps for a 1Ghz T1 core. Extrapolating to a T1 @1.2Ghz (by

GHz ratio) gives ~115MBps. I assume that your T5220 which has a T2 
processor will be faster, maybe 125MBps. A 1.6Ghz T2 processor will be 
able to run at maybe 160MBps (this figure is extremely speculative). 
Considering:

       Native Compressed (assuming 1.5 compression)
LTO-3  80     120
LTO-4 120     180
LTO-5 180     270

   So you can see why I suspect that a compressed LTO-4 is too much for 
1.6Ghz T2 core.

> 
> Is anyone out there using one of these servers with LTO-4 drives?
What
> has been your experience?
> 
> In case it matters.  Currently running 7.4.4 soon will be running
7.5.1.
> 
> Thank you for all the information lots of useful info there.
> 
> Joel
> 


-- 

-- Yaron.

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