12-01-2008
1.) Post the output of "vmstat 1 10" at these peak times.
2.) Is some data being used by your application placed on hdisk0? If yes, place this on other non busy disks. Application data usually has not be placed on the OS disks.
3.) Does your application or DB use Asynchronous I/O (AIO)?
4.) Show the output of "lsdev -C| grep -i aio".
5.) Show the output of "lspv| grep hdisk0".
6.) Show the output of "oslevel -s" or "oslevel -r"
7.) Show the output of "vmstat -v| tail -5"
8.) Post the answers here, get a coffee and wait for us to check.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Help!
Our mail server has 100% disk utilisation. I don't know much about linux but I need to delete something pronto. I only have to keep this thing ticking over until it is replaced by an exchange server in a few weeks, but the phone is constantly ringing with people telling me they can't send... (7 Replies)
Discussion started by: scg
7 Replies
2. UNIX for Dummies Questions & Answers
goodpeople, have a corrupt boot volume and systems keep's on crashing with it. suspecting drive is bad. question is how does one determine which of the 5 internal drives I have in my cage is hdisk0
any help would be appreciated
Thnx (2 Replies)
Discussion started by: Student37
2 Replies
3. AIX
hello, I must've screwed something here..
I just had hdisk0 replaced by IBM.. now it shows up as hdisk2 instead.
Before doing that, I've had it split from hdisk1, and reduced from rootvg.
Just did a rmdev -dl hdisk2.. ran cfgmgr, but still shows up as hdisk2 instead of hdisk0.. help! (2 Replies)
Discussion started by: kiem
2 Replies
4. HP-UX
how can I find cpu usage memory usage swap usage and
I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times
my final destination is monitor process
logical volume usage above X % and number of Logical voluage above
can I not to... (3 Replies)
Discussion started by: alert0919
3 Replies
5. Solaris
Hi,
I want to monitor the current cpu usage, monitor usage , disk I/o and network utlization for solaris using SNMP.
I want the oids for above tasks.
can you please tell me that
Thank you (2 Replies)
Discussion started by: S_venkatesh
2 Replies
6. AIX
How to monitor the IBM AIX server for I/O usage, memory usage, CPU usage, network usage, storage usage? (3 Replies)
Discussion started by: laknar
3 Replies
7. Solaris
Hi Guys,
I have observed the Oracle (DB USER) is utilizing 100% of the memory in the prstat -a output. I am bit confused is it normal and if not how to bring it down? ABout the machine it is a SunOS 5.10 Generic_125100-10 sun4v sparc SUNW,Sun-Fire-T200.
Please see below output of prstat -a... (12 Replies)
Discussion started by: Asteroid
12 Replies
8. UNIX for Dummies Questions & Answers
Hi all,
Can you please tell me the command, with which one can know the amount of space a specific directory has used.
df -k . ---> Displays, the amount of space allocated, and used for a directory.
du -k <dir name> - gives me the memory used of all the files inside <dir>
But i... (2 Replies)
Discussion started by: abhisheksunkari
2 Replies
9. UNIX for Dummies Questions & Answers
Hi Experts,
If you use df -iv and finds out that one of your mounted drives has 100% inodes used, how can you free it to have more free inodes%? I have removed some files, but still have the 100% used.
Thanks in advance.:b: (3 Replies)
Discussion started by: scomrade
3 Replies
10. UNIX for Dummies Questions & Answers
Let's say i have 20 users logged on Server. How can I know how much memory percent used each of them is using with system time in each user? (2 Replies)
Discussion started by: roy1912
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