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Re: [Networker] Sun Hardware
2009-10-15 11:02:59
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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