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Operating Systems AIX AIX dump device not showing accurate size Post 303025987 by paqman on Friday 16th of November 2018 12:06:34 PM
Old 11-16-2018
Quote:
Originally Posted by bakunin
OK, this is a valid explanation. Still, i suggest you use smaller disks for your rootvg. In my experience it is best to put only filesystems really really belonging to the system (not the application, not the data, not anything else) into the rootvg. First, when you take a system backup you back up the rootvg, aka mksysb. Guess, how long that takes on a multi-terabyte rootvg and, bonus question, how big of a size the resulting mksysb-image will be. For reference, my largest database server (700G memory, ~80TB database) has a (2x, mirrored) 120GB rootvg - and this is only because the customers insisted on swap space that will never be used. Otherwise i would have gone with our 2x60GB-standard-rootvg.

Second, modern systems are usually virtual and the disks are too. There is a big difference in moving around system disks (controlled by VIOS) and non-system disks because these can be unmounted/varyoffed easily while the system is under load. Therefore it is a good idea to separate system- and non-system-disks into seaparate VGs.



First off: thank you for telling us that! I perhaps never would have had that idea at all and so i (and all the others reading this thread) learned something from here too. Absolutely commendable! A word of caution too: you shouldn't just overwrite parts of the system. AIX has a great packaging system and i suggest you use it to your advantage:

- check which package the file came from with
Code:
lslpp -w </path/to/file>

then replace this package with a newer version.

- if you are interested in which else files the package contains issue
Code:
lslpp -f <packagename>

to get a list of files/directories belonging to this package.

I hope this helps.

bakunin
Thanks! Yes, I agree this system should not have been installed on such large disks. There are a couple of 300GB disks in there that I think the rootvg should go on. I am new to this company and wasn't involved in installing the makesysb image. However, it is new and not in production yet, I may make the recommendation we move it to the other disks. Most of our systems do use virtual disk, however I think due to the particular function of this server they decided to install locally.

Thanks for the info about the packages, I will look into that! I have been a Unix/Linux SA for 15 years, but am very new to AIX, so I appreciate the advice.

------ Post updated at 10:06 AM ------

Just for some additional information, it looks like this problem existed on all the servers we had running AIX 7100-03-04-1441. The fileset for the dumpcheck script was bos.sysmgt.serv_aid 7.1.2.0.
 

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advfsd(8)						      System Manager's Manual							 advfsd(8)

NAME
advfsd - Starts the AdvFS graphical user interface (GUI) daemon SYNOPSIS
/usr/sbin/advfsd DESCRIPTION
The AdvFS daemon, advfsd, is a process required by the AdvFS GUI (dtadvfs). The advfsd daemon issues commands and obtains system information on behalf of the AdvFS GUI. The /usr/var/advfs/daemon/socket/hosts.allow file contains a list of all hosts on which the advfsd daemon will allow the AdvFS GUI to run. This file can be edited to add or remove hosts. Each host name must be on a separate line. For example: host1 host3 host27 The /usr/var/advfs/daemon/socket/gui.passwd file, if it exists, is used by advfsd to force a dtadvfs user to enter a unique password when attempting to connect to the host. The first line of this file is the unique password required by the GUI. For example: guipassword For security reasons, do not use the password of the root user or any other user; make up a unique name and do not encrypt it. The advfsd daemon allows Simple Network Management Protocol (SNMP) clients such as NetView or Performance Manager (PM) to request AdvFS file system information. SNMP clients cannot issue system configuration commands to the advfsd daemon. The advfsd daemon is automatically started at boot time. Under normal conditions, this daemon does not need to be run manually. If you do not want to have the daemon started at boot time, move the /sbin/rc3.d/s53advfsd file from its default location to another directory and run it from that directory. Whenever you want to run the daemon at boot time, move the s53advfsd file back to the /sbin/rc3.d directory. The daemon (called an agent in the dtadvfs GUI interface) employs a file, /usr/var/advfs/daemon/disks.ignore, in which you can place the names of disks that the daemon will ignore when it gathers information about disks on the system. If you use the disks.ignore file, you can improve the performance of the dtadvfs GUI. Each line in the disks.ignore file contains the name of a disk (with no directory partition letter) to be ignored by the daemon. For example, to cause the disks /dev/disk/dsk3d and /dev/disk/dsk2g to be ignored, enter the following names on separate lines in the file: dsk2 dsk3 You cannot ignore an LSM volume by including the LSM volume name in the disks.ignore file; you must list the disks from which the LSM vol- ume is built. To ignore a complete disk group, you must list all the disks in it. Because all partitions on the listed disks will be ignored, unexpected results may occur if a disk has partitions belonging to more than one disk group. The disks.ignore file is processed each time the disks are checked. This means that if a disk fails or becomes unavailable, you can add the disk name to the disks.ignore file and the daemon will ignore it. Once the disk is available, remove the entry from the file. There is no need to stop the daemon. For more information, see the GUI interface reference page , dtadvfs(8). RESTRICTIONS
Only one advfsd daemon can be running on a system at a given time. If a second advfsd daemon attempts to start, it will fail. You must be the root user to use this utility and you must register the Advanced File System Utilities license. FILES
The script that starts the advfsd daemon at boot time. The advfsd message catalog. The SNMP data files. The sh scripts used by the dae- mon to execute commands. The advfsd daemon executable. The advfsd daemon message log file. Remove or copy this log to another location periodically to prevent the log from becoming too large. The security file that lists all hosts with permission to connect to the advfsd daemon with the AdvFS GUI (dtadvfs). The advfsd password file. The file that lists all disks for the advfsd daemon to ignore when col- lecting statistics about resources. SEE ALSO
advfs(4), dtadvfs(8) advfsd(8)
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