Statistics iobydasd Information
Purpose
Displays information about the number of reads and writes and the number of bytes transferred for each DASD volume. The number of I/Os and the amount of data transferred is determined on a DASD basis.
Format
syscall_parmlist
opcode int 245 STATOP_IOBYDASD
parms[0] int offset to STAT_API
parms[1] int offset of output following STAT_API
parms[2] int offset to system name (optional)
parms[3] int 0
parms[4] int 0
parms[5] int 0
parms[6] int 0
STAT_API
sa_eye char[4] "STAP"
sa_len int length of buffer that follows STAT_API
sa_ver int 1 or 2
sa_flags char[1] 0x00
SA_RESET 0x80 Reset statistics
sa_fill char[3] 0
sa_supported_ver int version of data returned
sa_reserve int[3] 0
posix_time_high unsigned int high order 32 bits since epoch
posix_time_low unsigned int low order 32 bits since epoch
posix_useconds unsigned int microseconds
pad1 int
int
API_IOBYDASD_HDR
number_of_lines int count of API_IOBYDASD_DATA lines
pad int 0
grand_total_waits hyper total waits
average_wait_time_whole int average wait time (whole number)
average wait time in milliseconds
average_wait_time_decimal int average wait time (decimal part)
decimal part is in thousanths
3 means .003 and 300 means .3
API_IOBYDASD_DATA[number_of_lines]
spare int 0
volser char[6] DASD volser
filler char[2] reserved
pavios unsigned int max number of concurrent I/Os zFS will issue
for this DASD
reads unsigned int count of reads for this DASD
read_bytes unsigned int bytes read for this DASD (in kilobytes)
writes unsigned int count of writes for this DASD
write_bytes unsigned int bytes written for this DASD (in kilobytes)
waits unsigned int waits
avg_wait_whole int average wait time (whole number)
average wait time in milliseconds
avg_wait_decimal int average wait time (decimal part)
decimal part is in thousanths
3 means .003 and 300 means .3
--or--
API_IOBYDASD_DATA2[number_of_lines]
spare int 0
volser char[6] DASD volser
filler char[2] reserved
unsigned int unsigned long long int max number of concurrent I/Os zFS
will issue for this DASD
reads unsigned long long int count of reads for this DASD
read_bytes unsigned long long int bytes read for this DASD (in kilobytes)
writes unsigned long long int count of writes for this DASD
write_bytes unsigned long long int bytes written for this DASD (in kilobytes)
waits unsigned long long int waits
avg_wait_whole int average wait time (whole number)
average wait time in milliseconds
avg_wait_decimal int average wait time (decimal part)
decimal part is in thousanths
3 means .003 and 300 means .3
systemname char[9]
Return_value 0 if request is successful, -1 if it is not successful
Return_code
EINTR zFS is shutting down
EINVAL Invalid parameter list
EMVSERR Internal error occurred
E2BIG Information too big for buffer supplied
Reason_code
0xEFnnxxxx See z/OS Distributed File Service Messages and CodesUsage notes
- Reserved fields and undefined flags must be set to binary zeros.
- When sa_supported_ver is 0 or
1, the output consists of API_IOBYDASD_HDR and API_IOBYDASD_DATA.
When sa_supported_ver is 2, the output consists
of API_IOBYDADD_HDR and API_IOBYDASD_DATA2.
Privilege required
None.
Related services
- Statistics iobyaggr Information
- Statistics iocounts Information
Restrictions
None.
Examples
#pragma linkage(BPX1PCT, OS)
#pragma LANGLVL(EXTENDED)
extern void BPX1PCT(char *, int, int, char *, int *, int *, int *);
#include <stdio.h>
#define ZFSCALL_STATS 0x40000007
#define STATOP_IOBYDASD 245 /* Performance API queries */
#define E2BIG 145
#define ENOMEM 132
typedef struct syscall_parmlist_t {
int opcode; /* Operation code to perform */
int parms[7]; /* Specific to type of operation, */
/* provides access to the parms */
/* parms[4]-parms[6] are currently unused*/
} syscall_parmlist;
typedef struct reset_time {
unsigned int posix_time_high; /* high order 32 bits since epoc */
unsigned int posix_time_low; /* low order 32 bits since epoch */
unsigned int posix_usecs; /* microseconds */
int pad1;
} RESET_TIME;
typedef struct hyper_t {
unsigned int high; /* unsigned int reserved */
unsigned int low;
} hyper;
/*********************************************************************/
/* The following structure is the api query control block */
/* It is used for all api query commands */
/*********************************************************************/
typedef struct stat_api_t {
#define SA_EYE "STAP"
char sa_eye[4]; /* 4 byte identifier must be */
int sa_len; /* length of the buffer to put data into*/
/* this buffer area follows this struct */
int sa_ver; /* the version number currently always 1*/
#define SA_VER_2 0x02
#define SA_VER_INIT 0x01
char sa_flags; /* flags field must be x00 or x80, */
/* x80 means reset statistics */
#define SA_RESET 0x80
char sa_fill[3]; /* spare bytes */
int sa_supported_ver; /* version of data returned */
int sa_reserve[3]; /* Reserved */
struct reset_time reset_time_info;
} STAT_API;
typedef struct api_iobydasd_hdr
{
int number_of_lines;
int pad;
hyper grand_total_waits;
int avg_wait_time_whole; /* in milliseconds */
int avg_wait_time_decimal; /* in thousandths */
/* of milliseconds */
/* for example, 3 means .003 */
/* and 300 means .3 */
} API_IOBYDASD_HDR;
typedef struct api_iobydasd_data_2
{
int spare;
char volser[6];
char filler[2];
unsigned int pavios;
unsigned long long int reads;
unsigned long long int read_bytes;
unsigned long long int writes;
unsigned long long int write_bytes;
unsigned long long int waits;
int avg_wait_whole;
int avg_wait_decimal;
} API_IOBYDASD_DATA_2;
/* Version 1 output structure */
typedef struct api_iobydasd_data
{
int spare;
char volser[6];
char filler[2];
unsigned int pavios;
unsigned int reads;
unsigned int read_bytes;
unsigned int writes;
unsigned int write_bytes;
unsigned int waits;
int avg_wait_whole;
int avg_wait_decimal;
} API_IOBYDASD_DATA;
struct parmstruct {
syscall_parmlist myparms;
STAT_API myapi;
/* output buffer API_IOBYDASD_HDR + multiple API_IOBYDASD_DATA_2s */
char systemname[9];
} myparmstruct;
int print_iobydasd_version1(API_IOBYDASD_HDR* stdh,
API_IOBYDASD_DATA *stdd);
int print_iobydasd_version2(API_IOBYDASD_HDR* stdh,
API_IOBYDASD_DATA_2 *stdd);
int main(int argc, char **argv)
{
int buffer_success = 0;
int bpxrv;
int bpxrc;
int bpxrs;
int i,t;
API_IOBYDASD_HDR *stdh;
API_IOBYDASD_DATA_2 *stdd;
char *stsy;
char buf[33];
struct parmstruct *myp = &myparmstruct;
int mypsize;
int buflen;
STAT_API *stapptr = &(myparmstruct.myapi);
myparmstruct.myparms.opcode = STATOP_IOBYDASD;
myparmstruct.myparms.parms[0] = sizeof(syscall_parmlist);
myparmstruct.myparms.parms[1] = sizeof(syscall_parmlist) + sizeof(STAT_API);
myparmstruct.myparms.parms[2] = 0;
/* Only specify a non-zero offset for the next field (parms[2]) if */
/* you are running z/OS 1.7 and above, and you want to query the */
/* iobydasd statistics of a different system than this one */
/* myparmstruct.myparms.parms[2] = sizeof(syscall_parmlist) */
/* + sizeof(STAT_API); */
myparmstruct.myparms.parms[3] = 0;
myparmstruct.myparms.parms[4] = 0;
myparmstruct.myparms.parms[5] = 0;
myparmstruct.myparms.parms[6] = 0;
memset(stapptr, 0, sizeof(STAT_API));
memcpy(stapptr->sa_eye, SA_EYE, 4);
stapptr->sa_ver = SA_VER_2;
stapptr->sa_len = 0;
/* This next field should only be set if parms[2] is non-zero */
/* strcpy(myparmstruct.systemname,"DCEIMGVQ"); */
BPX1PCT("ZFS ",
ZFSCALL_STATS, /* Perf statistics operation */
sizeof(myparmstruct), /* Length of Argument */
(char *)&myparmstruct, /* Pointer to Argument */
&bpxrv, /* Pointer to Return_value */
&bpxrc, /* Pointer to Return_code */
&bpxrs); /* Pointer to Reason_code */
for(t = 0; t < 1000 && buffer_success == 0; t++)
{
if (bpxrv < 0)
{
if (bpxrc == E2BIG)
{
buflen = stapptr->sa_len; /* Get buffer size needed */
mypsize = sizeof(syscall_parmlist) + sizeof(STAT_API) + buflen +
sizeof(myparmstruct.systemname);
free(myp);
myp = (struct parmstruct *)malloc((int)mypsize);
memset(myp, 0, mypsize);
printf("Need buffer size of %d, for a total of %d\n\n",
buflen, mypsize);
myp->myparms.opcode = STATOP_IOBYDASD;
myp->myparms.parms[0] = sizeof(syscall_parmlist);
myp->myparms.parms[1] = sizeof(syscall_parmlist) + sizeof(STAT_API);
myp->myparms.parms[2] = 0;
/* Only specify a non-zero offset for the next field (parms[2]) if */
/* you are running z/OS 1.7 and above, and you want to query the */
/* iobydasd statistics of a different system than this one */
/* myp->myparms.parms[2] = sizeof(syscall_parmlist) */
/* + sizeof(STAT_API) + buflen; */
myp->myparms.parms[3] = 0;
myp->myparms.parms[4] = 0;
myp->myparms.parms[5] = 0;
myp->myparms.parms[6] = 0;
stapptr = (STAT_API * )((char *)myp + sizeof(syscall_parmlist));
memcpy(stapptr->sa_eye, SA_EYE, 4);
stapptr->sa_ver = SA_VER_2;
stapptr->sa_len = buflen;
stdh = (API_IOBYDASD_HDR * )((char *)myp +
sizeof(syscall_parmlist) + sizeof(STAT_API));
stdd = (API_IOBYDASD_DATA_2*)((char*)stdh + sizeof(API_IOBYDASD_HDR));
stsy = (char *)((char *)myp + sizeof(syscall_parmlist) +
sizeof(STAT_API) + buflen);
/* This next field should only be set if parms[2] is non-zero */
/* strcpy(stsy,"DCEIMGVQ"); */
BPX1PCT("ZFS ",
ZFSCALL_STATS, /* Perf stats operation */
mypsize, /* Length of Argument */
(char *)myp, /* Pointer to Argument */
&bpxrv, /* Pointer to Return_value */
&bpxrc, /* Pointer to Return_code */
&bpxrs); /* Pointer to Reason_code */
if( bpxrv != 0 && bpxrc == E2BIG )
printf("E2BIG: %d times total\n", t++);
else if( bpxrv == 0 )
{
buffer_success = 1;
if( stapptr->sa_supported_ver == SA_VER_INIT )
{
API_IOBYDASD_DATA *stdd_v1;
stdd_v1 = (API_IOBYDASD_DATA * )((char *)stdh +
sizeof(API_IOBYDASD_HDR));
print_iobydasd_version1(stdh,stdd_v1);
}
else
print_iobydasd_version2(stdh,stdd);
unsigned int ptl = stapptr->reset_time_info.posix_time_low;
if (0 == ctime_r((time_t * ) & ptl, buf))
printf("Could not get timestamp.\n");
else
{ /* Insert the microseconds into the displayable time value */
strncpy(&(buf[27]), &(buf[20]), 6);
sprintf(&(buf[20]), "%06d", stapptr->reset_time_info.posix_usecs);
buf[26] = ' ';
buf[19] = '.';
printf("Last Reset Time: %s", buf);
}
free(myp);
}
else
{ /* iobydasd failed with large enough buffer */
printf("Error on iobydasd with large enough buffer\n");
printf("Error querying iobydasd, "
"BPXRV = %d BPXRC = %d BPXRS = %x\n",
bpxrv, bpxrc, bpxrs);
free(myp);
return bpxrc;
}
}
else
{ /* error was not E2BIG */
printf("Error on iobydasd trying to get required size\n");
printf("BPXRV = %d BPXRC = %d BPXRS = %x\n", bpxrv, bpxrc, bpxrs);
free(myp);
return bpxrc;
}
}
else
{ /* asking for buffer size gave rv = 0; maybe there is no data */
if (myparmstruct.myapi.sa_len == 0)
{
printf("No data\n");
printf("BPXRV = %d BPXRC = %d BPXRS = %x\n", bpxrv, bpxrc, bpxrs);
}
else
{ /* No, there was some other problem with getting the size needed */
printf("Error getting size required\n");
printf("BPXRV = %d BPXRC = %d BPXRS = %x\n", bpxrv, bpxrc, bpxrs);
}
free(myp);
return bpxrc;
}
}
if( t == 1000 )
printf("Number of failed buffer resizes exceeded.\n");
free(myp);
return 0;
}
int print_iobydasd_version2(API_IOBYDASD_HDR* stdh,
API_IOBYDASD_DATA_2 *stdd)
{
int i;
printf("%40czFS I/O by Currently Attached DASD/VOLs\n", ' ');
printf("\n");
printf("DASD PAV\n");
printf("VOLSER IOs Reads K bytes "
"Writes ");
printf("K bytes Waits Average Wait\n");
printf("------ --- -------------------- -------------------- "
"-------------------- ");
printf("-------------------- -------------------- ------------\n");
for (i = 0; i < stdh->number_of_lines; i++, stdd++)
{
printf("%6.6s %3u %20llu %20llu %20llu %20llu %20llu %6u.%3.3u\n",
stdd->volser,
stdd->pavios,
stdd->reads,
stdd->read_bytes,
stdd->writes,
stdd->write_bytes,
stdd->waits,
stdd->avg_wait_whole,
stdd->avg_wait_decimal);
}
printf("\n");
printf("Total number of waits for I/O: %u,,%u\n",
stdh->grand_total_waits.high, stdh->grand_total_waits.low);
printf("Average I/O wait time: %9u.%3.3u (msecs)\n",
stdh->avg_wait_time_whole,
stdh->avg_wait_time_decimal);
printf("\n");
return 1;
}
int print_iobydasd_version1(API_IOBYDASD_HDR* stdh,
API_IOBYDASD_DATA *stdd)
{
int i;
printf("Version 1 output is being displayed\n\n");
printf("%15c zFS I/O by Currently Attached DASD/VOLs\n",' ');
printf("\n");
printf("DASD PAV\n");
printf("VOLSER IOs Reads K bytes Writes "
"K bytes Waits Average Wait\n");
printf("------ --- ---------- ---------- ---------- "
"---------- ---------- ------------\n");
for (i = 0; i < stdh->number_of_lines; i++, stdd++)
{
printf("%6.6s %3u %10u %10u %10u %10u %10u %6u.%3.3u\n",
stdd->volser,
stdd->pavios,
stdd->reads,
stdd->read_bytes,
stdd->writes,
stdd->write_bytes,
stdd->waits,
stdd->avg_wait_whole,
stdd->avg_wait_decimal);
}
printf("\n");
printf("Total number of waits for I/O: %u,,%u\n",
stdh->grand_total_waits.high, stdh->grand_total_waits.low);
printf("Average I/O wait time: %9u.%3.3u (msecs)\n",
stdh->avg_wait_time_whole,
stdh->avg_wait_time_decimal);
printf("\n");
return 1;
}