xfs
[Top] [All Lists]

Re: Linux RAID & XFS Question - Multiple levels of concurrency = faster

To: John Robinson <john.robinson@xxxxxxxxxxxxxxxx>
Subject: Re: Linux RAID & XFS Question - Multiple levels of concurrency = faster I/O on md/RAID 5?
From: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Date: Sat, 1 Nov 2008 08:00:34 -0400 (EDT)
Cc: linux-raid@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <490C359F.7080504@xxxxxxxxxxxxxxxx>
References: <alpine.DEB.1.10.0811010424270.16517@xxxxxxxxxxxxxxxx> <490C359F.7080504@xxxxxxxxxxxxxxxx>
User-agent: Alpine 1.10 (DEB 962 2008-03-14)


On Sat, 1 Nov 2008, John Robinson wrote:

On 01/11/2008 08:29, Justin Piszcz wrote:
[...]
Why is running 3 jobs con-currently that take care of two parts each more than
twice as fast than running one job for six parts?

Because you have multiple CPUs?

So 1/4 of a quad core q6600 cannot achieve higher rates of I/O due to the
parity operations being that costly?

Is the only way to increase the single-threaded speed to increase the maximum
CPU core speed/get a faster CPU, and/or theoretically a multi-threaded md-raid
could maximize throughput?

Justin.


<Prev in Thread] Current Thread [Next in Thread>