querypv can read the PVID directly from the disk:

# lquerypv -h /dev/hdisk0 80 10
00000080   00C4489D 5E6002A5 00000000 00000000  |..H.^`..........|

# lspv
hdisk0          00c4489d5e6002a5                    rootvg          active    

Read PVID using linux command line (result reverting)

[root@linuxppc1]/# dd if=/dev/mapper/mpathb bs=1 skip=128 count=8 | od -x
8+0 records in
8+0 records out
0000000 fa00 3c34 b708 8edc
0000010
8 bytes (8 B) copied, 0.00075748 s, 10.6 kB/s

[padmin@vio1]/home/padmin$ lspv | grep 73
hdisk73          00fa343c08b7dc8e                     None

And also the VGDA and logical volumes on a VG:

# lqueryvg -Atvp hdisk0 
Max LVs:        256
PP Size:        27
Free PPs:       766
LV count:       12
PV count:       2
Total VGDAs:    3
Conc Allowed:   0
MAX PPs per PV: 1016
MAX PVs:        32
Quorum (disk):  0
Quorum (dd):    0
Auto Varyon ?:  1
Conc Autovaryon 0
Varied on Conc: 0
Logical:        00c4489d00004c00000001354404cb5c.2   hd6 1  
                00c4489d00004c00000001354404cb5c.3   hd5 1  
                00c4489d00004c00000001354404cb5c.4   hd8 1  
                00c4489d00004c00000001354404cb5c.5   hd3 1  
                00c4489d00004c00000001354404cb5c.6   hd1 1  
                00c4489d00004c00000001354404cb5c.7   hd11admin 1  
                00c4489d00004c00000001354404cb5c.8   livedump 1  
                00c4489d00004c00000001354404cb5c.13  fslv00 1  
                00c4489d00004c00000001354404cb5c.14  hd4 1  
                00c4489d00004c00000001354404cb5c.15  hd2 1  
                00c4489d00004c00000001354404cb5c.16  hd9var 1  
                00c4489d00004c00000001354404cb5c.17  hd10opt 1  
Physical:       00c4489d5e6002a5                1   0  
                00cf405e3e792147                2   0  
VGid:           00c4489d00004c00000001354404cb5c
Total PPs:      1092
LTG size:       128
HOT SPARE:      0
AUTO SYNC:      0
VG PERMISSION:  0
SNAPSHOT VG:    0
IS_PRIMARY VG:  0
PSNFSTPP:       4352
VARYON MODE:    0
VG Type:        0
Max PPs:        32512
Mirror Pool Str n
Sys Mgt Mode:   0
VG Reserved:    1
PV RESTRICTION: 0
Infinite Retry: 2

To find out which application crashed the OS use:

# /usr/sbin/lquerypv -h /path/to/core 6b0 64

Read the first 1000 blocs of a disk

# lquerypv -h /dev/hdisk0 00 1000