LinuxQuestions.org
Share your knowledge at the LQ Wiki.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices


Reply
  Search this Thread
Old 07-01-2008, 04:59 AM   #1
your_shadow03
Senior Member
 
Registered: Jun 2008
Location: Germany
Distribution: Slackware
Posts: 1,461
Blog Entries: 6

Rep: Reputation: 51
dm0 in iostat???


Hey Guys,

One of our Performance testing team need help on iostat output:
They are unable to understand what dm0 means in iostat output:
Code:
What  below output does mean

 

 

[root@BL10DL385 dev]# iostat

Linux 2.6.9-67.ELsmp (BL10DL385.mailserver.com)         07/01/2008      _x86_64_

 

avg-cpu:  %user   %nice %system %iowait  %steal   %idle

           0.81    0.00    0.18    0.19    0.00   98.82

 

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn

cciss/c0d0       12.86       163.74       625.36   54100608  206627140

dm-0              0.25         0.54         1.88     177802     620248

dm-1              0.22         0.75         1.66     246330     548624

dm-2              0.00         0.00         0.00        754         16

dm-3              0.08         0.01         0.65       2258     214824

dm-4              0.20         3.64         0.83    1202122     275696

dm-5              0.00         0.01         0.00       2106        600

dm-6              0.23         0.58         1.59     192114     525368

dm-7             15.57        76.18        48.37   25172440   15981352

dm-8              0.39         0.01         3.12       2378    1031728

dm-9              2.02         0.01        16.12       1690    5327184

dm-10             0.36         0.23         2.83      74786     934416

dm-11             0.00         0.01         0.00       4930       1528

dm-12            39.49        81.31       310.62   26865338  102634160

dm-13            29.69         0.26       237.23      84634   78383704

dm-14             0.00         0.00         0.00       1370         56

dm-15             0.06         0.15         0.45      47986     147632

 

[root@BL10DL385 dev]# fdisk -l

 

Disk /dev/cciss/c0d0: 146.7 GB, 146745262080 bytes

255 heads, 63 sectors/track, 17840 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

           Device Boot      Start         End      Blocks   Id  System

/dev/cciss/c0d0p1   *           1          13      104391   83  Linux

/dev/cciss/c0d0p2              14       17840   143195377+  8e  Linux LVM

[root@BL10DL385 dev]#
Code:
[root@BL10DL385 dev]# fdisk -l

Disk /dev/cciss/c0d0: 146.7 GB, 146745262080 bytes
255 heads, 63 sectors/track, 17840 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

           Device Boot      Start         End      Blocks   Id  System
/dev/cciss/c0d0p1   *           1          13      104391   83  Linux
/dev/cciss/c0d0p2              14       17840   143195377+  8e  Linux LVM

Pls Help
 
Old 07-01-2008, 05:13 AM   #2
Mr. C.
Senior Member
 
Registered: Jun 2008
Posts: 2,529

Rep: Reputation: 61
Logical volume managers' logical volumes: dm0 - dm6.
 
Old 07-01-2008, 05:16 AM   #3
your_shadow03
Senior Member
 
Registered: Jun 2008
Location: Germany
Distribution: Slackware
Posts: 1,461
Blog Entries: 6

Original Poster
Rep: Reputation: 51
What does it means? Can You elaborate ??
 
Old 07-01-2008, 05:17 AM   #4
your_shadow03
Senior Member
 
Registered: Jun 2008
Location: Germany
Distribution: Slackware
Posts: 1,461
Blog Entries: 6

Original Poster
Rep: Reputation: 51
Is it showing good status??
 
Old 07-01-2008, 05:20 AM   #5
Mr. C.
Senior Member
 
Registered: Jun 2008
Posts: 2,529

Rep: Reputation: 61
Your system is almost completely idle. Run man iostat to learn about each field.

Utilities like iostat/vmstat/netstat are mostly meaningless until you become familiar with their output under various load conditions, ranging from none, to heavily loaded.

Download the bonnie++ benchmarks to get a feel for how the numbers look under load. Bonnie will also give you its benchmark results.
 
Old 07-01-2008, 05:31 AM   #6
your_shadow03
Senior Member
 
Registered: Jun 2008
Location: Germany
Distribution: Slackware
Posts: 1,461
Blog Entries: 6

Original Poster
Rep: Reputation: 51
I have downloaded boniee++
but donno know how to use it.
[root@BL11DL385 ~]# cd /opt
[root@BL11DL385 opt]# ls
bonnie++-1.03c.gz
[root@BL11DL385 opt]# gunzip bonnie++-1.03c.gz
[root@BL11DL385 opt]# ls
bonnie++-1.03c
[root@BL11DL385 opt]# cd bonnie++-1.03c
-bash: cd: bonnie++-1.03c: Not a directory
[root@BL11DL385 opt]# ls
bonnie++-1.03c
 
Old 08-28-2009, 03:44 PM   #7
RichardBronosky
LQ Newbie
 
Registered: Feb 2007
Location: Atlanta, GA, USA
Distribution: KnoppMyth, Ubuntu
Posts: 18

Rep: Reputation: 1
which dm is which?

Quote:
Originally Posted by Mr. C. View Post
Logical volume managers' logical volumes: dm0 - dm6.
More specifically, if you want to know what each dm maps to, you can awk it together like so:
Code:
~# sudo lvdisplay|awk  '/LV Name/{n=$3} /Block device/{d=$3; sub(".*:","dm-",d); print d,n;}'
dm-0 /dev/SysVolGroup/LogVolRoot
dm-1 /dev/SysVolGroup/xen
dm-2 /dev/SysVolGroup/db1-2
dm-3 /dev/SysVolGroup/db1-2swap
dm-4 /dev/SysVolGroup/python1
dm-5 /dev/SysVolGroup/python1swap
dm-6 /dev/SysVolGroup/db1-2snap
 
1 members found this post helpful.
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
iostat question mokku Linux - Newbie 3 06-26-2008 10:04 PM
discrepencey between iostat and df noping Linux - Kernel 2 10-27-2006 12:00 PM
iostat question hcclnoodles Solaris / OpenSolaris 4 10-16-2006 03:14 PM
iostat Volcano Linux - Newbie 3 10-04-2005 10:28 AM
iostat FragInHell Solaris / OpenSolaris 2 07-02-2004 06:02 AM


All times are GMT -5. The time now is 03:54 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration