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Re: XFS use within multi-threaded apps

To: xfs@xxxxxxxxxxx
Subject: Re: XFS use within multi-threaded apps
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Sun, 24 Oct 2010 20:22:46 +0200
Cc: Angelo McComis <angelo@xxxxxxxxxxx>
In-reply-to: <AANLkTi=RZ=qf5xqMQNZjZaikAdw12PzbzD3vo-hZfNHT@xxxxxxxxxxxxxx>
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On Samstag, 23. Oktober 2010 Angelo McComis wrote:
> They quoted having 10+TB databases running OLTP on EXT3 with
> 4-5GB/sec sustained throughput (not XFS).

Which servers and storage are these? This is nothing you can do with 
"normal" storages. Using 8Gb/s Fibre Channel gives 1GB/s, if you can do 
full speed I/O. So you'd need at least 5 parallel Fibre Channel storages 
running without any overhead. Also, a single server can't do that high 
rates, so there must be several front-end servers. That again means 
their database must be especially organised for that type of load 
(shared nothing or so).

On the other hand, if they have these performance numbers on 100 shared 
serves, it only needs 51MB/s per server of I/O to get 5GB/s total 
throughput. So that is a number without a lot of meaning, as long as you 
don't know which hardware is used.

And: how high would be their throughput when using XFS instead EXT3? ;-)

One question comes to my mind: if they do direct I/O, would there still 
be a lot of difference between XFS and EXT3, performance wise?

And how many companies run around telling which filesystem they use for 
their performance critical business application? Normally they do this 
only for marketing, so they get paid or special prices if they say "with 
this product we are sooo happy".

-- 
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc

it-management Internet Services
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