Could you please post the output of the following commands, taken at a period with high load (like, when your backup runs). Ideally the following commands/scriptlets are started and stopped at the same time so they refer to the same period of time. Let them run for ~5 minutes:
For iostat to be available you might have to install the "sysstat" rpm package.
Hello all,
I just stuck up in an uncertain situation related to network performance...
I am trying to access one of my remote client unix machine from a distant location..
The client machine is Ultra-5_10 , with SunOS 5.5.1
The ndd result ( hme1 )shows that the machine is hooked to a... (5 Replies)
We have a AIX v5.3 on a p5 system with a poor performing Ingres database.
We added one CPU to the system to see if this would help. Now there are two CPU's.
with sar and topas -P I see good results: CPU usage around 30%
with topas I only see good results in the process output screen, the... (1 Reply)
Hi,
on a linux server I have the following :
vmstat 2 10
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 0 675236 39836 206060 1617660 3 3 3 6 8 7 1 1 ... (1 Reply)
In my C program i am using very large file(approx 400MB) to read parts of it frequently. But due to large file the performance of the program goes down very badly. It shows very high I/O usage and I/O wait time.
My question is, What are the ways to optimize or tune I/O on linux or how i can get... (10 Replies)
Hi Gurus,
I am beginner in solaris and want to know what are the things we need to check for performance monitoring on our solairs OS.
for DISK,CPU and MEMORY.
Also how we do ipforwarding in slaris
Many thanks for your help
Pradeep P (4 Replies)
Hi,
We have 2 lpars on p6 blade. One of the lpar is having 3 core cpu with 5gb memory running sybase as database. An EOD process takes 25 min. to complete.
Now we have an lpar on P7 server with entitled cpu capacity of 2 with 16 Gb memory and sybase as database. The EOD process which takes... (17 Replies)
Hi
We have an AIX5.3 server with application which is written in C. We are facing server (lpar) hangs intermediately. If we open new telnet window prompts for user and takes hell of a time to authenticate, not only that if we run ps -aef then also it takes lot of time. surprisingly there is no... (2 Replies)
Discussion started by: powerAIX
2 Replies
9. Post Here to Contact Site Administrators and Moderators
SCO OpenServer(TM) Release 5 (worf.xxx.com)
Worf is my proxy Server, and it runs my Lan with windows PCs, wk2s & XPs. There are only two users who POP the mailbox from the Server to client, elena and me nancy! elena can POP her email mailbox is just fine.
We use Eudora and for years we... (1 Reply)
First, please forgive me for my 2nd attempt to post in a Forum!
And btw, the Code Tags tutorial has the fonts and the sizes,
but when I am editing my post none of those fonts and sizes
are not there!
SCO OpenServer(TM) Release 5 (worf.xxx.com)
Worf is our proxy & POP Server, and it... (7 Replies)
Discussion started by: Nancy L
7 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