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Re: Yet Another mkfs.xfs RAID Question

To: Stephen Lord <lord@xxxxxxx>
Subject: Re: Yet Another mkfs.xfs RAID Question
From: Christian Guggenberger <Christian.Guggenberger@xxxxxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 2 Feb 2003 16:27:11 +0100
Cc: linux-xfs@xxxxxxxxxxx, waltabbyh@xxxxxxxxxxx, mkp@xxxxxxx
In-reply-to: <1044198718.1372.0.camel@xxxxxxxxxxxxxxxxxxxxx>
References: <20030201130427.GA8128@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <yq1lm0zsno1.fsf@xxxxxxxxxxxxxx> <1044198718.1372.0.camel@xxxxxxxxxxxxxxxxxxxxx>
Reply-to: Christian.Guggenberger@xxxxxxxxxxxxxxxxxxxxxxxx
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On Sun, Feb 02, 2003 at 09:11:55AM -0600, Stephen Lord wrote:
> On Sat, 2003-02-01 at 15:20, Martin K. Petersen wrote:
> > >>>>> "Christian" == Christian Guggenberger 
> > >>>>> <Christian.Guggenberger@xxxxxxxxxxxxxxxxxxxxxxxx> writes:
> > 
> > Christian> I'm going to set up a new 1.7 TB HW Raid 5 next week.  RAID
> > Christian> 5 contains 11 disks, Stripe Unit should be (according to
> > Christian> the manual) 128k.  so my mkfs.xfs options will be
> > Christian> sunit=256, swidth=2560 for the data section, won't they?
> > 
> > Yup.
> > 
> > 
> > Christian> I will definitly use internal log, so I'd like to ask, if I
> > Christian> should use logversion 2, and what sunit and swidth values I
> > Christian> should use here?  I guess the same as for the data
> > Christian> section???
> > 
> > 128KB log alignment seems a bit of an overkill.
> > 
> > Does your controller state which chunk size it uses internally?  Most
> > controllers use 4-16KB blocks for RAID5.  So try aligning your log to
> > values in that neighbourhood.
> 
> 4K is usually enough to fix performance issues, but it may be dependent
> on the underlying raid too.
> 
I could give it try, anyway...
This sunit options for the logsection can be overruled at mount time,
could'n't they??

I'll check out the manpage.

Christian


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