Re: Raidframe performances (was: Re: NFS performances)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, May 13, 2014 at 09:53:57AM +0000, Emmanuel Dreyfus wrote:
> On Tue, May 13, 2014 at 11:24:02AM +0200, Manuel Bouyer wrote:
> > You should also check the partition alignements.
> 
> raid1 uses ld1a and ld2a
> Both ld1a and ld2a have a NetBSD RAID partition starting at sector 63 
> (very usual stuff).

For large disks this can be a problem. Try to make is start at 2048.

> raid1 has a NetBSD FFS partition starting at 
> sector 0.
> 
> > Also, you didn't say what the underlying hardware is.
> 
> SATA disks configured as JBOD (each disk is exported as is) on a 
> 3ware 9550SX controler.
> 
> But as said earlier, for a disk that has a partition in a RAID
> an another partition outside of the RAID, the performance are weak
> with the RAID and good without it. The underlying hardward hence 
> seems fine.

At what offset does the partition without RAID start ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--