Odd geometry from solaris prtvtoc

Question

the prtvtoc output, actually it should be the disk geometry, is odd. we have EMC DMX2000 storage attached, prtvtoc shows different size of disk has different geometry, 15G disk shows 15 tracks/cylinder, 62G disk shows 30 tracks/cylinder, 250G disk shows 120 tracks/cylinder. actually, dmx2000 reports geometry as 15 tracks/cylinder. does anyone have idea? does solaris changes geometry according to disk size? thanks.
/dev/rdsk/emcpower10c BCV EMC SYMMETRIX 5671 7100A7B000 15704640KB
/dev/rdsk/emcpower15c BCV EMC SYMMETRIX 5671 7100A73000 62818560KB
/dev/rdsk/emcpower117c M(16) EMC SYMMETRIX 5671 710018A000 251274240KB
# prtvtoc /dev/rdsk/emcpower10c
*/dev/rdsk/emcpower10c partition map*
Dimensions:
512 bytes/sector
*64 sectors/track*
{color:#0000ff}15 tracks/cylinder{color}
*960 sectors/cylinder*
32718 cylinders
*32716 accessible cylinders*
Flags:
1: unmountable
*10: read-only*
Unallocated space:
First Sector Last
Sector Count Sector
0 960 959
First Sector Last
Partition Tag Flags Sector Count Sector Mount Directory
*2 5 01 0 31407360 31407359*
*3 15 01 960 2880 3839*
*4 14 01 3840 31403520 31407359*
*# prtvtoc /dev/rdsk/emcpower15c*
/dev/rdsk/emcpower15c partition map
Dimensions:
*512 bytes/sector*
64 sectors/track
*{color:#0000ff}30 tracks/cylinder{color}*
1920 sectors/cylinder
*65436 cylinders*
65434 accessible cylinders
Flags:
*1: unmountable*
10: read-only
Unallocated space:
First Sector Last
Sector Count Sector
*0 1920 1919*
First Sector Last
Partition Tag Flags Sector Count Sector Mount Directory
2 5 01 0 125633280 125633279
3 15 01 1920 3840 5759
4 14 01 5760 125627520 125633279
# prtvtoc /dev/rdsk/emcpower117c
*/dev/rdsk/emcpower117c partition map*
Dimensions:
512 bytes/sector
*64 sectors/track*
{color:#0000ff}120 tracks/cylinder{color}
*7680 sectors/cylinder*
65436 cylinders
*65434 accessible cylinders*
Flags:
1: unmountable
*10: read-only*
Unallocated space:
First Sector Last
Sector Count Sector
0 7680 7679
First Sector Last
* Partition Tag Flags Sector Count Sector Mount Directory
2 5 01 0 502533120 502533119
3 15 01 7680 69120 76799
4 14 01 76800 502456320 502533119
Edited by: madeit on Dec 30, 2009 10:48 AM
Edited by: madeit on Dec 30, 2009 10:49 AM
Edited by: madeit on Dec 30, 2009 11:03 AM

Answer 1

Cross-posted to multiple forums.
[http://forums.sun.com/thread.jspa?threadID=5422031|http://forums.sun.com/thread.jspa?threadID=5422031]
(That is bad forum manners, by the way. Don't do it.)
The discussion occurred in that original post. This additional posting accomplished nothing.