09-30-2011
This User Gave Thanks to vmcore For This Post:
10 More Discussions You Might Find Interesting
1. Filesystems, Disks and Memory
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)
Discussion started by: dj_is
3 Replies
2. UNIX for Dummies Questions & Answers
Hello,
On Solaris 10, iostat -E gives me the following results:
sd1 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: FUJITSU Product: MAY2073RCSUN72G Revision: 0501 Serial No: 0708S08M2L
Size: 73.40GB <73400057856 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0... (1 Reply)
Discussion started by: lieselr
1 Replies
3. Shell Programming and Scripting
Does anyone have an example of IOSTAT -eE in a script???????
Need to see the syntax in a script (4 Replies)
Discussion started by: walnutpony123
4 Replies
4. Solaris
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)
Discussion started by: adilyos
3 Replies
5. AIX
Hello, I support Oracle 11g on AIX 7.1.
Using the command
$iostat -D hdisk2 hdisk4 hdisk5 5
I get the following output:
hdisk5 xfer: %tm_act bps tps bread bwrtn
44.0 1.4M 178.2 1.4M 14.7K
read: ... (3 Replies)
Discussion started by: oracledba1024
3 Replies
6. Solaris
Hi Everyone,
I try to calculate the total hard disk space of a solaris machine using iostat -En command. Iterating the output and summing up all the number present near the Size: will give the exact size of the harddisk. But it is not working for a machine.
This command works in many flavors... (2 Replies)
Discussion started by: prasankn
2 Replies
7. SuSE
Hi,
my os is SLES 10
from sort
iostat
as my output does not include rkB/s and wkB/s I probably have to adjust the key position, so
is the following iostat pipe to sort service request command correct?
oracle@vmc_stallite:~> iostat -x | sort -nrk11
sda 0.96 ... (4 Replies)
Discussion started by: jediwannabe
4 Replies
8. Shell Programming and Scripting
Hi,
I have a requirement where parsed output from various linux commands like top, netstat, iostat, etc. will be the input for one javascript with the parsed output from these commands converted to JSON format
For "iostat" command, since there are two outputs - one w.r.t CPU utilization and... (2 Replies)
Discussion started by: gopivallabha
2 Replies
9. Shell Programming and Scripting
Hi,
I got the code below is one of the threads from this forum.
lineCount=$(iostat | wc -l)
numDevices=$(expr $lineCount - 7);
iostat $interval -x -t |
awk -v awkCpuFile=$cpuFile -v awkDeviceFile=$deviceFile -v awkNumDevices=$numDevices '
BEGIN {
print... (2 Replies)
Discussion started by: gopivallabha
2 Replies
10. Red Hat
I am facing strange behaviour of iostat command and top command. where initially it is showing high utilization and after it is showing low utilization.
iostat command
avg-cpu: %user %nice %system %iowait %steal %idle
73.60 0.01 23.93 0.92 0.00 1.54
Device: rrqm/s wrqm/s r/s w/s... (3 Replies)
Discussion started by: manoj.solaris
3 Replies
iostat(1) General Commands Manual iostat(1)
NAME
iostat - Reports I/O statistics
SYNOPSIS
iostat [drive...] [interval] [count]
OPERANDS
Forces iostat to display specific drives. If drive is not specified (or the specified drive does not exist on the system or cluster,
iostat displays the first two drives (even if more than two disk drives are configured in the system). Causes iostat to report once each
interval seconds. The first report is for all time since the system was last booted, and each subsequent report is for the last interval
only.The value must not be 0. Specifies the number of reports. For example, iostat 1 10 would produce 10 reports at 1-second intervals.
You cannot specify count without interval because the first numeric argument to iostat is assumed to be interval.
DESCRIPTION
The iostat command reports the following information: For terminals (collectively), the number of characters read and written per second.
For each disk, the number of transfers per second and bytes transferred per second (in kilobytes). For the system, the percentage of time
the system has spent in user mode, in user mode running low priority (nice) processes, in system mode, and idling.
To compute this information, iostat counts data transfer completions, the number of words transferred for each disk, and the collective
number of input and output characters for terminals. Also, each sixtieth of a second, iostat examines the state of each disk and makes a
tally if the disk is active.
When you issue an iostat command on a cluster member, it displays statistics only for those disks that are local to the member and that
member's usage of those shared disks that it has mounted. It displays 0 for other disks in the cluster (those it doesn't have mounted),
regardless of whether they are on the shared bus or are local to some other member.
EXAMPLES
The output from this example displays cpu, terminal, and disk statistics for the first two disks on the system providing 5 reports at 1
second intervals:
# iostat 1 5
tty floppy1 dsk9 cpu
tin tout bps tps bps tps us ni sy id
0 3 0 0 0 0 1 0 4 95
4 58 0 0 0 0 1 0 2 97
1 53 0 0 0 0 0 0 2 98
5 59 0 0 0 0 1 0 1 98
6 60 0 0 0 0 1 0 2 97
The second example specifies device names in the command:
# iostat dsk2 dsk3 cdrom2
tty dsk2 cdrom2 dsk3 cpu
tin tout bps tps bps tps bps tps us ni sy id
0 13 11 5 5 2 2427 1213 0 1 1 98
SEE ALSO
Commands:vmstat(1)
iostat(1)