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Re: nfs/local performance with software raid5 and xfs and SMP

To: Tru Huynh <tru@xxxxxxxxxx>, Nathan Straz <nstraz@xxxxxxx>, "linux-xfs@xxxxxxxxxxx" <linux-xfs@xxxxxxxxxxx>
Subject: Re: nfs/local performance with software raid5 and xfs and SMP
From: Steve Lord <lord@xxxxxxx>
Date: Fri, 20 Jul 2001 12:43:51 -0500
In-reply-to: Message from Steve Lord <lord@xxxxxxx> of "Fri, 20 Jul 2001 11:00:36 CDT." <200107201600.f6KG0aG32766@xxxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
> 
> Just one comment here, the configuration in case c) is never a good idea,
> the raid code will automatically cause the disk head to thrash around
> that is why the performance is so bad there. I am not totally sure why
> we can do a reasonable job on deletes on a single disk, but not on a
> raid - there are synchronous writes in there. Unless your single disk
> xfs is on ide with write caching turned on. One more comment on xfs
> delete speed is that multiple parallel threads doing deletes will
> run faster than a single thread doing deletes, so lots of different
> threads doing deletes will not be as bad as a single large directory
> delete.
> 
> Steve
> 


I made a mistake here I meant config b) not c) - it looks like write
caching is on in this case.

Steve



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