sar.1m (2010 09)

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sar(1M) sar(1M)

NAME

sar - system activity reporter

SYNOPSIS

sar [-aAbcdHLmMqPRStuvwyz

][-p

psetid ][-o ﬁle ] t [ n ]

sar [-aAbcdHLmMqPRStuvwy

][-p

psetid ][-s time ][-e time ][-i sec ][-f ﬁle ]

DESCRIPTION

In the ﬁrst form above,

sar samples cumulative activity counters in the operating system at n intervals

of t seconds. If the

-o option is speciﬁed, it saves the samples in ﬁle in binary format. The default value

of n is 1.

In the second form, with no sampling interval speciﬁed,

sar extracts data from a previously recorded

ﬁle, either the one speciﬁed by

-f option or, by default, the standard system activity daily data ﬁle

/var/adm/sa/sa

dd for the current day dd. The starting and ending times of the report can be

bounded via the

-s and -e time arguments of the form hh [:mm [:ss ] ]. The

-i option selects records

at sec-second intervals. Otherwise, all intervals found in the data ﬁle are reported.

Options

Subsets of data to be printed are speciﬁed by options:

-a Report use of ﬁle access system routines:

iget/s Number of ﬁle system iget() calls per second.

namei/s Number of ﬁle system lookuppn() (pathname translation) calls per

second.

dirblk/s Number of ﬁle system blocks read per second doing directory lookup.

-A Report all data. Equivalent to -abcdHLmqtuvwy

-b Report buffer activity:

bread/s Number of physical reads per second from the disk (or other block devices) to

the buffer cache.

bwrit/s Number of physical writes per second from the buffer cache to the disk (or

other block device).

lread/s Number of reads per second from buffer cache.

lwrit/s Number of writes per second to buffer cache.

%rcache Buffer cache hit ratio for read requests, for example, 1 − bread/lread.

%wcache Buffer cache hit ratio for write requests, for example, 1 − bwrit/lwrit.

pread/s Number of reads per second from character device using the physio()

(raw I/O) mechanism.

pwrit/s Number of writes per second to character device using the physio() (raw

I/O) mechanism.

-c Report system calls:

scall/s Number of system calls of all types per second.

sread/s Number of read() and/or readv() system calls per second.

swrit/s Number of write() and/or writev() system calls per second.

fork/s Number of fork() and/or vfork() system calls per second.

exec/s Number of exec() system calls per second.

rchar/s Number of characters transferred by read system calls block devices only) per

second.

wchar/s Number of characters transferred by write system calls (block devices only)

per second.

-d Report activity for each block device, for example, disk or tape drive. One line is printed for

each device that had activity during the last interval. If no devices were active, a blank line

HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

Summary of content (6 pages)

PAGE 1
sar(1M) sar(1M) NAME sar - system activity reporter SYNOPSIS sar [-aAbcdHLmMqPRStuvwyz] [-p psetid ] [-o file ] t [ n ] sar [-aAbcdHLmMqPRStuvwy] [-p psetid ] [-s time ] [-e time ] [-i sec ] [-f file ] DESCRIPTION In the first form above, sar samples cumulative activity counters in the operating system at n intervals of t seconds. If the -o option is specified, it saves the samples in file in binary format. The default value of n is 1.
PAGE 2
sar(1M) sar(1M) is printed. Each line contains the following data: device Logical name of the device and its corresponding instance. Devices are categorized into the following device types: disk3 − SCSI and NIO FL disks sdisk − SCSI disks. %busy Portion of time device was busy servicing a request. avque Average number of requests outstanding for the device. r+w/s Number of data transfers per second (read and writes) from and to the device. r/s Number of reads per second from the device.
PAGE 3
sar(1M) -m sar(1M) %busy Portion of time lunpath was busy servicing a request. avque Average number of requests outstanding for the lunpath. r/s Number of reads per second from the lunpath. w/s Number of writes per second to the lunpath. blks/s Number of bytes transferred (in 512-byte units) from and to the LUN using this lunpath. avwait Average time (in milliseconds) that transfer requests waited idly on queue for this lunpath.
PAGE 4
sar(1M) -t -u -v A sA -w -y 4 sar(1M) Report activity for each tape device. One line is printed for each tape device that had activity during the last interval. If no devices were active, a blank line is printed. Each line contains the following data: device Logical name of the tape device and its corresponding instance. %busy Portion of time the device was busy servicing a request. r/s Number of reads per second from the device. w/s Number of writes per second to the device.
PAGE 5
sar(1M) -z sar(1M) rawch/s Raw input characters per second. canch/s Input characters per second processed by canon(). outch/s Output characters per second. rcvin/s Receive incoming character interrupts per second. xmtin/s Transmit outgoing character interrupts per second. mdmin/s Modem interrupt rate (not supported; always 0). Report Memory File System (MemFS) data.
PAGE 6
sar(1M) sar(1M) For devices that are opened and closed frequently (such as tapes), data might not be reported for the activity in the prior interval. The data might not be reported, because the device might be closed at the instant when data is collected. The recommendation for such devices is to use shorter intervals (t ) of seconds. When multi-pathing is enabled and I/O is issued on a legacy LUN, sar -d may not report I/O that is redirected through other paths to the agile device.