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,
I'll check out the manpage.