04-27-2011
Thanks for the lines. Day by day becomes trickier. We are moving from IBM DS800 storage to a new Hitachi Storage and it looks like performance is a lot better. I suppose bigger cache at the Storage subsystem make a big difference but then you may face other bottlenecks like network latency or fiber channels congestions. Also in the near futture we will be migrating to a new Power7 server where most of these bottleneck suppose to disapear. Thanks again.
10 More Discussions You Might Find Interesting
1. Solaris
Hi all, hope you are having a nice day, its nice and warm today in Canberra Australia.
iostat -e / -E reports soft and hard errors. Any idea what these are exactly? All I hear are I/O's failing and needing to retry, but no cause as to why they fail.
My SUN guru tells me its our EMC SAN... (1 Reply)
Discussion started by: scottman
1 Replies
2. UNIX for Advanced & Expert Users
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)
Discussion started by: foongkt5220
2 Replies
3. Shell Programming and Scripting
Hi gurus,
I need to set up an array like this
set - A arr 'A', 'B'
The output of this array should be like this 'A','B'
Right now, I get the output like this 'A B'
Can anyone suggest me on how to achieve this.
thanks (3 Replies)
Discussion started by: ragha81
3 Replies
4. Shell Programming and Scripting
So I use Cacti for monitoring IO statistics on my servers, now originally I couldnt monitor Multipath deviced servers as they have alot of /dev/sdxx and /dev/emcpowerxx, I have devised a method of trimming them down to just the actual devices but the issue is the output looks like so.
# iostat... (0 Replies)
Discussion started by: RiSk
0 Replies
5. Shell Programming and Scripting
Friends,
.
On linux i have to run iostat command and in each iteration have to print the greatest value in each column.
e.g
iostat -dt -kx 2 2 | awk ' !/sd/ &&!/%util/ && !/Time/ && !/Linux/ {print $12}'
4.38
0.00
0.00
0.00
What i would like to print is only the... (3 Replies)
Discussion started by: achak01
3 Replies
6. Shell Programming and Scripting
Friends,
Need some help.
On linux i have to run iostat command and in each iteration have to print the greatest value in each column.
e.g
iostat -dt -kx 2 2 | awk ' !/sd/ &&!/%util/ && !/Time/ && !/Linux/ {print $12}'
4.38
0.00
0.00
0.00
WHhat i would like to... (15 Replies)
Discussion started by: achak01
15 Replies
7. Solaris
My scheduled collection of statistics is giving very large output because of an high number of ssd device not associated to any disk
The iostat -x command is collecting statistics from them and the output is very large.
I.g.
if a run
iostat -x|tail +3|awk '{print $1}'>f0.txt.$$
iostat... (5 Replies)
Discussion started by: sun-mik
5 Replies
8. Solaris
Noticed that asvc_t values in iostat command outputs are mostly more than 100 in our previous iostat analysis.
Also found the following detail from an alternate site IO Bottleneck - Disk performance issue - UnixArena
----
1. asvc_t average service time of active transactions, in... (2 Replies)
Discussion started by: saraperu
2 Replies
9. 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
10. 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
LEARN ABOUT ULTRIX
iostat
iostat(1) General Commands Manual iostat(1)
Name
iostat - report I/O statistics
Syntax
iostat [ -c ] [ -t ] [ disknames ] [ interval ] [ count ]
Description
The command reports I/O statistics for terminals, disks and cpus. For terminals the number of input and output characters are counted.
For disks the number of 512 byte blocks per second and number of transfers per second are displayed. For cpus, it provides the percentage
of time the system has spent in user mode, in user mode running low priority (niced) processes, in system mode, and idling. On multipro-
cessor systems these cpu statistics represent a cumulative summary of all the cpus.
The optional disknames argument causes disk statistics to be displayed for the specified disks. If this argument is not specified then
disk statistics will be displayed for the first 3 disks only.
The optional interval argument causes to report once each interval seconds. The first report is for all time since a reboot and each sub-
sequent report is for the last interval only.
The optional count argument restricts the number of reports.
Options
-c Displays the percentage of time each cpu spent in user mode, running low priority (nice'd) processes, in system mode, and idling.
-t Displays the number of characters read from and written to terminals.
Examples
This example will cause cpu and disk statistics for the 5 disks ra0, ra1, ra2, ra3, and ra4.
iostat ra0 ra1 ra2 ra3 ra4
This example will cause cpu, terminal, and disk statistics for ra0 to be displayed and updated every 2 seconds.
iostat -t ra0 2
Files
See Also
vmstat(1), cpustat(1)
iostat(1)