asvc_t above 25 ms for a disk is high: consider a faster disk,
or (better) try to optimize your application!
Or add RAM in case there is paging activity with
For nfs devices an asvc_t above 100ms is still okay.
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)
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)
Hi,
I got a request from a client to check on their server's cpu, memory and disk utilization. Am planning to use the sar and iostat commands to achieve this. The server is used for sending and receiving messages between the stockbrokers, so I was thinking to run the commands during the market... (9 Replies)
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)
Friends,
I have to run iostat -d on my AIX machine and print the sum of the output in tps column per iteration. can any one pls guide me how to do this using awk. here is the sample output
iostat -d 2 2 | awk '!/System/ && !/Disks/ && !/cd/ && !/^$/ {print $4}'
2.0
3.0
1.0
3.0... (1 Reply)
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)
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)
Hi Guys,
I've been having some arguments with my colleagues about one thing. Always my thought was that as as far as disk performance is concern by looking at the output of the iostat command (AIX) you would be able to identify if you have a hot disk and then by moving some files out that disk... (3 Replies)
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)
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 NETBSD
iostat
IOSTAT(8) BSD System Manager's Manual IOSTAT(8)NAME
iostat -- report I/O statistics
SYNOPSIS
iostat [-CdDITx] [-c count] [-M core] [-N system] [-w wait] [drives]
DESCRIPTION
iostat displays kernel I/O statistics on terminal, disk and CPU operations. By default, iostat displays one line of statistics averaged over
the machine's run time. The use of -c presents successive lines averaged over the wait period. The -I option causes iostat to print raw,
unaveraged values.
Only the last disk option specified (-d, -D, or -x) is used.
The options are as follows:
-c count Repeat the display count times. Unless the -I flag is in effect, the first display is for the time since a reboot and each sub-
sequent report is for the time period since the last display. If no wait interval is specified, the default is 1 second.
-C Show CPU statistics. This is enabled by default unless the -d, -D, -T, or -x flags are used.
-d Show disk statistics. This is the default. Displays kilobytes per transfer, number of transfers, and megabytes transferred.
Use of this flag disables display of CPU and tty statistics.
-D Show alternative disk statistics. Displays kilobytes transferred, number of transfers, and time spent in transfers. Use of this
flag disables the default display.
-I Show the running total values, rather than an average.
-M core Extract values associated with the name list from the specified core instead of the default ``/dev/mem''.
-N system Extract the name list from the specified system instead of the default ``/netbsd''.
-T Show tty statistics. This is enabled by default unless the -C, -d, or -D flags are used.
-w wait Pause wait seconds between each display. If no repeat count is specified, the default is infinity.
-x Show extended disk statistics. Each disk is displayed on a line of its own with all available statistics. This option overrides
all other display options, and all disks are displayed unless specific disks are provided as arguments. Additionally, separate
read and write statistics are displayed.
iostat displays its information in the following format:
tty
tin characters read from terminals
tout characters written to terminals
disks
Disk operations. The header of the field is the disk name and unit number. If more than four disk drives are configured in the sys-
tem, iostat displays only the first four drives. To force iostat to display specific drives, their names may be supplied on the com-
mand line.
KB/t Kilobytes transferred per disk transfer
t/s transfers per second
MB/s Megabytes transferred per second
The alternative display format, (selected with -D), presents the following values.
KB Kilobytes transferred
xfr Disk transfers
time Seconds spent in disk activity
cpu
us % of CPU time in user mode
ni % of CPU time in user mode running niced processes
sy % of CPU time in system mode
id % of CPU time in idle mode
FILES
/netbsd Default kernel namelist.
/dev/mem Default memory file.
SEE ALSO fstat(1), netstat(1), nfsstat(1), ps(1), systat(1), vmstat(1), pstat(8)
The sections starting with ``Interpreting system activity'' in Installing and Operating 4.3BSD.
HISTORY
iostat appeared in Version 6 AT&T UNIX. The -x option was added in NetBSD 1.4.
BSD March 1, 2003 BSD