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I'm writing a C program to check the status of each PV in a VG and it's
proving somewhat harder than anticipated. First I can't find a way to
determine the VGID for a given volume group name, so I hard-coded that part.
I did the same with a PVID as well, just for testing. I then found that I
couldn't get lvm_querypv to return success no matter what combination of
VGID, PVID, and PVName arguaments that I supplied.
Does anyone know how to get this call to work?
I'm running AIX 4.3.3 ML 09.
I've assumed that the 16-digit VGID as reported by 'lsvg rootvg' should be
supplied in 4 goups of 4 hex digits to the word1, word2, word3, and word4
elements of the unique_id structure for VG_ID, and similar with 'lsv hdisk0'
for the PV_ID.
My code is embedded below.
With PVName = "/dev/junk" I get "Invalid device entry" which is reasonable,
but with "/dev/hdisk0" I get "Invalid parameter" which surprised me.
Replacing PVName with NULL, I get status = -100, ie the VG is offline.
That's quite disappointing. And yes, I'm running it as root.
Anyone got a useful suggestion?
TIA
Jeffrey


#include <lvm.h>

main ()
{
struct unique_id VG_ID;
struct unique_id PV_ID;
struct querypv *QueryPV;
char PVName[20] = "/dev/hdisk0";
int status;

/* dilbert rootvg vgid 00019b0a5e4e69ea */
VG_ID.word1 = 0x0001;
VG_ID.word2 = 0x9b0a;
VG_ID.word3 = 0x5e4e;
VG_ID.word4 = 0x69ea;

/* dilbert hdisk0 (rootvg) pvid 00019b0a89184fbe */
PV_ID.word1 = 0x0001;
PV_ID.word2 = 0x9b0a;
PV_ID.word3 = 0x8918;
PV_ID.word4 = 0x4fbe;

status = lvm_querypv (&VG_ID, &PV_ID, &QueryPV, PVName);
printf ("QueryPV = %x\n", QueryPV);
printf ("lvm_querypv\n\tVG_ID = 0x%04x%04x%04x%04x\n\tPV_ID =
0x%04x%04x%04x%04x\n\tPVName = \"%s\"\n\tstatus = %d\n",
VG_ID.word1, VG_ID.word2, VG_ID.word3, VG_ID.word4,
PV_ID.word1, PV_ID.word2, PV_ID.word3, PV_ID.word4,
PVName, status);
switch (status) {
case LVM_OFFLINE:
printf ("VG is offline - vary on the VG\n");
break;
case LVM_INVALID_PARAM:
printf ("Invalid parameter\n");
break;
case LVM_PVOPNERR:
printf ("PV open error\n");
break;
case LVM_NOTVGMEM:
printf ("PV is not a VG member\n");
break;
case LVM_INVCONFIG:
printf ("Invalid device driver configuration\n");
break;
case LVM_INV_DEVENT:
printf ("Invalid device entry\n");
break;
} ;

exit (status);
}