For disk errors, look for cxtxdx in the messages or the sd device equivalent..
Example, sd0 below, you can check against and compare the iostat -E and iostat -En command to find the correct disk.
Hi all,
i have run iostat -em, and get below result. Can i know what is this output meaning, and how to fix that problem.
iostat -em
---- errors ---
device s/w h/w trn tot
sd7 0 1 0 1
sd8 1 1 0 2
sd9 0 1 0 1
sd10 0 ... (2 Replies)
All,
I am attempting to help tune a Sun for better performance (mainly for SAS 9.1), and have found indicators pointing to poor I/O utilization. I have run iostat -cx, and found one device in particular where the %w is in the 90's during processing. I have a feeling that this is where the SAS... (3 Replies)
Hi All AIX expert
i'm using AIX 5.2
When i execute this command which is :
----------------------------------------------------------------------
>> iostat -a
System configuration: lcpu=4 disk=30
tty: tin tout avg-cpu: % user % sys % idle % iowait
... (2 Replies)
Friends.
I have to compare iostat -x output with a tool on solaris. Now there is column called wait in the output field which is showing zero. Now, in order to create some load on my system this is what i am doing
I am creating a file using dd command , the size of which is... (5 Replies)
A find for the "iostat" command on a redhat 5 update 4 comes back with no results.
Any separate rpm needs to be installed to get the binary for this ?
Thanks in advance. (1 Reply)
I all,
I would like to know what are the causes of :
-soft error
-harderror
-transport error
and how to avoid and repare them.
I got the iostat out put below:
atng-mm01% iostat -En | grep -i hard
c0t0d0 Soft Errors: 1 Hard Errors: 0 Transport Errors: 0
c0t0d1 ... (3 Replies)
Hi Unix experts,
I have a question regarding a disk failure seen in "iostat -Enm" output:
# iostat -Enm
c1t0d0 Soft Errors: 0 Hard Errors: 7 Transport Errors: 9
Vendor: FUJITSU Product: MAU3073NCSUN72G Revision: 0802 Serial No: 0514F005M0
Size: 73.40GB <73400057856 bytes>
Media... (5 Replies)
Hello everyone,
Can you please explain me what kind of information do IOSTAT show ?
iostat -xnz 3 show me those informations:
The I/O of the c0t0d0 disk is normal ?
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 ... (3 Replies)
Hello, I support Oracle 11g on AIX 7.1.
Using the command
$iostat -D hdisk2 hdisk4 hdisk5 5
I get the following output:
hdisk5 xfer: %tm_act bps tps bread bwrtn
44.0 1.4M 178.2 1.4M 14.7K
read: ... (3 Replies)
Discussion started by: oracledba1024
3 Replies
LEARN ABOUT OSX
iostat
IOSTAT(8) BSD System Manager's Manual IOSTAT(8)NAME
iostat -- report I/O statistics
SYNOPSIS
iostat [-CUdKIoT?] [-c count] [-n devs] [-w wait] [drives]
DESCRIPTION
Iostat displays kernel I/O statistics on terminal, device and cpu operations. The first statistics that are printed are averaged over the
system uptime. To get information about the current activity, a suitable wait time should be specified, so that the subsequent sets of
printed statistics will be averaged over that time.
The options are as follows:
-? Display a usage statement and exit.
-C Display CPU statistics. This is on by default, unless -d is specified.
-c Repeat the display count times. If no wait interval is specified, the default is 1 second.
-d Display only device statistics. If this flag is turned on, only device statistics will be displayed, unless -C or -U or -T is also
specfied to enable the display of CPU, load average or TTY statistics.
-I Display total statstics for a given time period, rather than average statistics for each second during that time period.
-K In the blocks transferred display (-o), display block count in kilobytes rather then the device native block size.
-n Display up to devs number of devices. iostat will display fewer devices if there aren't devs devices present.
-o Display old-style iostat device statistics. Sectors per second, transfers per second, and miliseconds per seek are displayed. If -I
is specified, total blocks/sectors, total transfers, and miliseconds per seek are displayed.
-T Display TTY statistics. This is on by default, unless -d is specified.
-U Display system load averages. This is on by default, unless -d is specified.
-w Pause wait seconds between each display. If no repeat count is specified, the default is infinity.
Iostat displays its information in the following format:
tty
tin characters read from terminals
tout characters written to terminals
devices
Device operations. The header of the field is the device name and unit number. iostat will display as many devices as will fit in a
standard 80 column screen, or the maximum number of devices in the system, whichever is smaller. If -n is specified on the command
line, iostat will display the smaller of the requested number of devices, and the maximum number of devices in the system. To force
iostat to display specific drives, their names may be supplied on the command line. iostat will not display more devices than will fit
in an 80 column screen, unless the -n argument is given on the command line to specify a maximum number of devices to display, or the
list of specified devices exceeds 80 columns. If fewer devices are specified on the command line than will fit in an 80 column screen,
iostat will show only the specified devices.
The standard iostat device display shows the following statistics:
KB/t kilobytes per transfer
tps transfers per second
MB/s megabytes per second
The standard iostat device display, with the -I flag specified, shows the following statistics:
KB/t kilobytes per transfer
xfrs total number of transfers
MB total number of megabytes transferred
The old-style iostat display (using -o) shows the following statistics:
sps sectors transferred per second
tps transfers per second
msps average milliseconds per transaction
The old-style iostat display, with the -I flag specified, shows the following statistics:
blk total blocks/sectors transferred
xfr total transfers
msps average milliseconds per transaction
cpu
us % of cpu time in user mode
sy % of cpu time in system mode
id % of cpu time in idle mode
EXAMPLES
iostat -w 1 disk0 disk2
Display statistics for the first and third disk devices device every second ad infinitum.
iostat -c 2
Display the statistics for the first four devices in the system twice, with a one second display interval.
iostat -Iw 3
Display total statistics every three seconds ad infinitum.
iostat -odICTw 2 -c 9
Display total statistics using the old-style output format 9 times, with a two second interval between each measurement/display. The -d flag
generally disables the TTY and CPU displays, but since the -T and -C flags are given, the TTY and CPU displays will be displayed.
SEE ALSO fstat(1), netstat(1), nfsstat(1), ps(1), pstat(8)
The sections starting with ``Interpreting system activity'' in Installing and Operating 4.3BSD.
HISTORY
This version of iostat first appeared in FreeBSD 3.0.
BSD September 27, 2001 BSD