On Mon, 10 Jan 2011, Joe Landman wrote:
Try this:
# (on bravo)
dd if=/dev/zero of=/cluster/shadow/big.file bs=1M count=20k
This will write a 20GB file to the same partition. We need to see how fast
that write is (outside of cache)
Do the same test on the other machine.
Infiniband won't make slow disks fast. So unless you are already getting a
gigabyte or two per second (we do on our units), adding Infiniband won't get
you any significant additional performance.
Put another way, you are bound by the slowest aspect of your storage system.
What are your underlying disks? Are these individual drives? RAID? What
sort of RAID if it is a RAID? How is it organized?
We tune our systems pretty hard, so we start with 2+GB/s for TB sized files
before we ever touch the next stack up. Each additional stack you traverse
takes performance away (you lose it in stack inefficiency). So you should
start out with as fast a system as you possibly can, so you don't lose too
much performance.
What hardware gives you 2+GB/s? I am using the 16 port 3Ware 9750 cards
with fast drives and I dont get close to that.
-Nathan
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