On Mon, Apr 13, 2009 at 10:33 PM, Mike Christie <micha...@cs.wisc.edu> wrote:
> I think linux is just not so good with smaller IO sizes like 4K. I do
> not see good performance with Fibre Channel or iscsi.

Most people run a filesystem on top of a block device imported via
open-iscsi. It is well known that a filesystem performs I/O to the
underlying block device using block sizes between 4 KB and 64 KB, with
a significant fraction being 4 KB I/O's. If there was a performance
problem in Linux with regard to small block sizes, filesystem
performance in Linux would suffer. I have not yet seen statistics that
show that Linux' filesystem performance is worse than for other
operating systems. But I have already seen measurements that show the


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