On 07/07/2011 04:40 AM, Papp Tamas wrote:

On the node:

$ dd if=/dev/zero of=adsdfgrr bs=128K count=100k oflag=direct
102400+0 records in
102400+0 records out
13421772800 bytes (13 GB) copied, 27.4022 s, 490 MB/s

The same on the cluster volume is ~50-60 MB/s.

This is what you expect over GE, more towards the lower end of the range (assuming a non-optimized driver and network stack).


Network layer is GE, nodes are connected with two NICs in bonding.

Bonding will not help single threaded reads/writes. It could help multiple simultaneous reads and writes. But a single process doing reads/writes will go over a single link (in general).

I am absolutely desparated. Is it Ubuntu? Would be better with Fedora?
Or does the Storage Platform run on an optimized kernel or something
like that?

I don't understand this. What are your needs, and what are your expectations based upon those needs? Do you have the right equipment to meet the needs, or do you need to buy more/better equipment to meet the needs?


--
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics Inc.
email: [email protected]
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