Please give the correct ps command:
And repeat this after one hour, compare the first two columns (VSZ and SZ) to see if something is growing.
Your vmstat output:
Because pi is greater than 0 it is really short of memory. The current memory image does not fit into RAM so it needs to page-in from disk - performance suffers.
As long po is 0 the memory image does not grow further (no page-out to disk).
i have a unix batch written in c, dealing with really time-consuming
database operations
i want to write a ksh script to monitor its performance.
which items i should monitor?
do you have any suggestions?
1)cputime
2)swap area
3)pmem
4)
5)
what else? (1 Reply)
Hi Gurus,
Need to have a way to monitor Bandwidth utilization on Linux servers, running squid .
Have worked on 3rd party monitoring tools like Bandwidth d, Nagios etc.
But we are working to find out a way to monitor this through Sitescope, for which we need to find a file where the... (4 Replies)
Hi i am am monitioring a file every 60 seconds and checking if the file has changed and if it has changed i append the changes to another file. i am able to monitior the change in file size but i have a problem copying the changes made in the file to another file. i am using lseek to seek the last... (1 Reply)
Hi
Can any one helpe me in obtaining commands , which enables me to know the following :
Monitor Storage
Monitor RAM & CPU Utilization
Monitor Power Supply
Best wishes (1 Reply)
Hi,
I am trying to write a script to do monitoring kind of stuff,
requirement - when a server is given a start it updates a file called server.log, I need to keep on grepping the word "Running" and as soon as it comes , script should be exited with the message , "Server came up... (2 Replies)
Hi All,
I am writing a tool which remotely monitors network devices and sends an alarm if the device does not respond just like an NMS.
Can I use Threads module and invoke a simultaneous ping/snmpwalk to 100 or more devices and raise an alarm if any of the devices do no respond?
Please... (1 Reply)
Hello All,
I have written a script which will grep for error codes in a file and if the count for the same is about 500 it will send and smpp alert.
Here is my code.
#!/bin/bash
#########################################################################################################... (3 Replies)
I currently have a shellscript to check the size of a filesystem and email me if the size is over a certain percentage (80%). I have this script on crontab and executes the shell every 10 mins.
I have the above in place on 8 servers. It so happens that a file system on one of the servers is... (1 Reply)
Hello,
Can somebody suggest me any Free monitoring utility (preferably GUI) for Mysql DB(community edition).
What i am looking at is something that can give me a trend of DB performance and suggest when to upgrade or add more DB resources to existing infra.
Note - I tried mtop. but it... (3 Replies)
Discussion started by: Hari_Ganesh
3 Replies
LEARN ABOUT FREEBSD
md
MD(4) BSD Kernel Interfaces Manual MD(4)NAME
md -- memory disk
SYNOPSIS
device md
DESCRIPTION
The md driver provides support for four kinds of memory backed virtual disks:
malloc Backing store is allocated using malloc(9). Only one malloc-bucket is used, which means that all md devices with malloc backing
must share the malloc-per-bucket-quota. The exact size of this quota varies, in particular with the amount of RAM in the system.
The exact value can be determined with vmstat(8).
preload A file loaded by loader(8) with type 'md_image' is used for backing store. For backwards compatibility the type 'mfs_root' is also
recognized. If the kernel is created with option MD_ROOT the first preloaded image found will become the root file system.
vnode A regular file is used as backing store. This allows for mounting ISO images without the tedious detour over actual physical media.
swap Backing store is allocated from buffer memory. Pages get pushed out to the swap when the system is under memory pressure, otherwise
they stay in the operating memory. Using swap backing is generally preferable over malloc backing.
For more information, please see mdconfig(8).
EXAMPLES
To create a kernel with a ramdisk or MD file system, your kernel config needs the following options:
options MD_ROOT # MD is a potential root device
options MD_ROOT_SIZE=8192 # 8MB ram disk
makeoptions MFS_IMAGE=/h/foo/ARM-MD
options ROOTDEVNAME="ufs:md0"
The image in /h/foo/ARM-MD will be loaded as the initial image each boot. To create the image to use, please follow the steps to create a
file-backed disk found in the mdconfig(8) man page. Other tools will also create these images, such as NanoBSD.
SEE ALSO disklabel(8), fdisk(8), loader(8), mdconfig(8), mdmfs(8), newfs(8), vmstat(8)HISTORY
The md driver first appeared in FreeBSD 4.0 as a cleaner replacement for the MFS functionality previously used in PicoBSD and in the FreeBSD
installation process.
The md driver did a hostile takeover of the vn(4) driver in FreeBSD 5.0.
AUTHORS
The md driver was written by Poul-Henning Kamp <phk@FreeBSD.org>.
BSD October 30, 2007 BSD