Partition alignment

[Andrea Venturoli]

Hello.

I'm looking for confirmation that the following partition alignement 
will *not* result in performance penalties:

> root@:~ # mfiutil show volumes
> mfi0 Volumes:
>   Id     Size    Level   Stripe  State   Cache   Name
>  mfid0 (  835G) RAID-5     256k OPTIMAL Enabled

> root@:~ # fdisk /dev/mfid0
> ******* Working on device /dev/mfid0 *******
> parameters extracted from in-core disklabel are:
> cylinders=109053 heads=255 sectors/track=63 (16065 blks/cyl)
>
> Figures below won't work with BIOS for partitions not in cyl 1
> parameters to be used for BIOS calculations are:
> cylinders=109053 heads=255 sectors/track=63 (16065 blks/cyl)
>
> Media sector size is 512
> Warning: BIOS sector numbering starts with sector 1
> Information from DOS bootblock is:
> The data for partition 1 is:
> sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
>     start 63, size 1751936382 (855437 Meg), flag 80 (active)
> 	beg: cyl 0/ head 1/ sector 1;
> 	end: cyl 1023/ head 254/ sector 63
> The data for partition 2 is:
> <UNUSED>
> The data for partition 3 is:
> <UNUSED>
> The data for partition 4 is:
> <UNUSED>

> root@:~ # bsdlabel /dev/mfid0s1
> # /dev/mfid0s1:
> 8 partitions:
> #          size     offset    fstype   [fsize bsize bps/cpg]
>   a:   33554432 1224736768    4.2BSD        0     0     0
>   b:   33554432   16777216      swap
>   c: 1751936382          0    unused        0     0     # "raw" part, don't edit
>   d:   16777216          0    4.2BSD        0     0     0
>   e:   67108864   50331648    4.2BSD        0     0     0
>   f:   33554432  117440512    4.2BSD        0     0     0
>   g:  536870912  150994944    4.2BSD        0     0     0
>   h:  536870912  687865856    4.2BSD        0     0     0

Or, again:

> root@:~ # gpart show /dev/mfid0
> =>        63  1751949249  mfid0  MBR  (835G)
>           63  1751936382      1  freebsd  [active]  (835G)
>   1751936445       12867         - free -  (6.3M)

> root@:~ # gpart show /dev/mfid0s1
> =>         0  1751936382  mfid0s1  BSD  (835G)
>            0    16777216        4  freebsd-ufs  (8.0G)
>     16777216    33554432        2  freebsd-swap  (16G)
>     50331648    67108864        5  freebsd-ufs  (32G)
>    117440512    33554432        6  freebsd-ufs  (16G)
>    150994944   536870912        7  freebsd-ufs  (256G)
>    687865856   536870912        8  freebsd-ufs  (256G)
>   1224736768    33554432        1  freebsd-ufs  (16G)
>   1258291200   493645182           - free -  (235G)

AFAICT the partition are correctly aligned within the slice, but I'm not 
sure about the slice itself.

Thanks to anyone who will help.

  bye
	av.