Difference between Major and Minor in AIX

Thread Tools Search this Thread
Operating Systems AIX Difference between Major and Minor in AIX
# 1  
Old 05-22-2009
Difference between Major and Minor in AIX

Difference between Major and Minor in AIX
# 2  
Old 05-22-2009
You really need to be more specific and descriptive with your questions.

Major and Minor what?
# 3  
Old 05-22-2009
Originally Posted by Padow
You really need to be more specific and descriptive with your questions.

Major and Minor what?


what is the use of the major and minor number in AIX
# 4  
Old 05-23-2009
A quick search on "major and minor number" in google produces lots of result
major and minor number in unix - Google Search
or tip of info from my side
The two numbers are stored in special file type, "character special" or
"block special" file. When that file is opened, the resulting file
descriptor is connected to the driver which is identified by the major
number. The minor number is simply an extra parameter that is passed to
the driver during the open, allowing multiple device files to refer to
the same driver, yet be distinguished from each other by that driver.
(The driver doesn't see the name which was used to open it: all it goes
by is the minor number). Minor numbers are a necessary flexibility,
making it possible for one driver to provide multiple device instances,
multiple behaviors for one device, or anything else that needs to be
distinguished: for instance logical partitions on a disk block device
# 5  
Old 05-23-2009
If you run ASM, the major/minor numbers of your disk devices compared with the ASM devices are the only way for you to find out if a disk is in use or not.

In addition they help you to find out which logdevice is too small for example - the errpt only gives you the major/minor numbers but doesnt tell you the name of the logfile.

If you run a veritas cluster, you have to tell the clusterconfig which major number your volumegroups have to enable the cluster to vary it on ...

ODM manages filesystems and rawdevices via major/minor and determines which logdevice corresponds to which filesystem

Kind regards
# 6  
Old 05-23-2009
In HACMP it is wise to use the same major number for each volume group throughout the cluster - makes identifikation of corresponding disks so much easier.

I hope this helps.

Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Filtering my major and minor values

I want to remove all rows with a minor repeating count less than 30% compared to the major repeating count from my table. The values of a col(starting col 2) can assume is A,T,G,C and N. Each row has at least 2 values and at most 4 repeating values(out of ATGC). N is considered a missing value... (12 Replies)
Discussion started by: newbie83
12 Replies

2. Solaris

Major and Minor number of Virtual File System

Hi friends, Please let me know if there is any way to find out Major and Minor numbers of virtual file system like below: /devices 0K 0K 0K 0% /devices ctfs 0K 0K 0K 0% /system/contract proc 0K 0K ... (8 Replies)
Discussion started by: nitj
8 Replies

3. Shell Programming and Scripting

How to filter out major and minor?

Hi, I have line like this : proj_name/module/trunk/module_1_0 where the first "1" refers to major version and second "0" refers to minor version. any AWK or command like that so that I can filter out the major and minor ? like major= command | input line minor= command |... (4 Replies)
Discussion started by: bhaskar_m
4 Replies

4. Programming

which head file for major and minor function?

#include <sys/types.h> #include <sys/stat.h> #include <sys/termios.h> #include <stdio.h> #include <stdlib.h> #include <stddef.h> #include <string.h> #include <unistd.h> #include <signal.h> #include <sys/mkdev.h> int main(int argc, char *argv) { int i; struct stat buf; ... (4 Replies)
Discussion started by: konvalo
4 Replies

5. AIX

how do I change major-minor numbers of disk devices

Good evening ... does anyone of you know how to change major/minor numbers of disk devices ? I had to migrate from raid1 to raid5 and this messed up my ASM cluster - I know which devices should have which IDs to match the content - but I have no idea how to change it. Any help would be... (2 Replies)
Discussion started by: zxmaus
2 Replies

6. Solaris

Help with Major and minor number

Hi Does anyone know what the major and minor numbers are in Solaris? (2 Replies)
Discussion started by: wisdom
2 Replies

7. Shell Programming and Scripting

sort major.minor.release_build_x

would like to order this input based on major.minor.release AND build number Label abc_def_0.0.3_build_999 2008/08/01 'Created by me.' Label abc_def_0.0.9_build_1000 2008/08/01 'Created by me.' Label abc_def_9.0.9_build_10001 2008/08/01 'Created by me.' Label abc_def_10.9.100_build_2... (4 Replies)
Discussion started by: gurpal2000
4 Replies

8. Solaris

major & minor number

Hi Can anyone tell me what is major number and minor number in the mknod command. Also what these numbers mean. I have gone through the man pages but still I couldn't understand. Regards (3 Replies)
Discussion started by: RajaRC
3 Replies

9. Programming

Device Major/Minor numbers

To further my fledgling knowledge of C, I am re-writing some of the Unix command set. My current command is an ls-style command. All works well, except for device files. How do I get the major/minor numbers for the dev files? I see from the stat struct there are st_rdev and st_dev members. Do... (1 Reply)
Discussion started by: zazzybob
1 Replies
Login or Register to Ask a Question

Featured Tech Videos