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.
Steve
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