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NDMP/isilon throughput question
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Post NDMP/isilon throughput question 
Hi all,

I'm looking for a bit of advice here as we plan a migration.

I'm running netbackup 7.0 (plan to upgrade), win2008r2, IBM LTO4 tape
drives in a Dell (not sure of OEM) library. Single server, dell R610, 2x
intel e5620, 16GB ram. Plenty of RAM & CPU.

Interface to tape drives is fibre channel; using a qlogic 4Gb card.

Currently I have two EMC Celerra NS120's, and I use 3-way NDMP direct to
tape to back them up. This works reasonably well and I get reported
throughput of 90MB/sec on multiple streams.

I'm looking at buying an Isilon system (3x X200), and am considering
whether to continue to use 3-way NDMP (and buy isilon's fibre channel
backup appliance to do so), move to 2-way NDMP, or possibly something else.

In particular I'm wondering about what kind of performance I can expect
with 2-way NDMP.

I am imagining connecting one of the isilon nodes direct to the
netbackup server via a dedicated 10Gb ethernet link, and adding a
dual-port 4Gb fibre channel card. WIth this combo, The nominal
interface speeds are enough to saturate all 4 tape drives. But can a
netbackup media server (with the master running too) push that much data
through? Or some large percentage of it?

I saw some discussion of isilon in the list archives, one person
suggested this kind of config, and skipping the isilon "accelerator."
But that was several years back and didn't really discuss throughput.

Any other recommendations welcome.

thanks
danno
--
Dan Pritts
ICPSR Computing & Network Services
University of Michigan
+1 (734)615-7362
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Post NDMP/isilon throughput question 


Currently I have two EMC Celerra NS120's, and I use 3-way NDMP direct to tape to back them up. This works reasonably well and I get reported throughput of 90MB/sec on multiple streams.

I'm looking at buying an Isilon system (3x X200), and am considering whether to continue to use 3-way NDMP (and buy isilon's fibre channel backup appliance to do so), move to 2-way NDMP, or possibly something else.

In particular I'm wondering about what kind of performance I can expect with 2-way NDMP.


...and as i read some docs I think I've gotten the meaning of 2-way and 3-way NDMP confused.

current setup: EMC NS120's are connected by fibre channel to the tape drives. netbackup server is only doing control, no data traffic goes through the netbackup server.

proposed setup: isilon sends data over ethernet to netbackup server, which writes data to tape via fibre channel.

--
Dan Pritts
ICPSR Computing & Network Services
University of Michigan
+1 (734)615-7362

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