AIX mksysb medium write error Post: 302925086

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Operating Systems AIX AIX mksysb medium write error Post 302925086 by bakunin on Thursday 13th of November 2014 11:21:43 PM

11-14-2014

Registered User

Quote:

Originally Posted by fierfek

i can write files and directories to the mount from AIX. the ulimit on the ubuntu server is set to unlimited. the ulimit on the AIX box is not set to unlimited will that have an affect? If the rootvg is 200Gb and there are 100Gb free. Do in need 200Gb or 100Gb of space for mksysb to write to?

You need as much space as is really taken. backup (mksysb is ultimately based on backup) will need some space for metadata and mksysb information will also take some space but in the end the size of the mksysb image will be about as big as the used space in your VG ("used space" meaning "space taken by files", not "space given to LVs").

There are several limits in place here which could affect operation: first, there is a ulimit for the root user of your AIX machine. It will curtail the size of the mksysb image file root can write.

Second, there might be a FS size limit on the Ubuntu server. See the disk quotas, FS properties and similar things on the Ubuntu server exporting the mount.

Third, when you mount a directory via NFS you need a user local to the exporting server which is used for privilege mangement there: the user in the AIX machine might be root, but when it writes something to the NFS mount this write operation takes place at the remote machine and has to be run under a certain user there - which is NOT the AIX root but some user to which "the root from the remote machine" is translated to. It might even be nobody. (This is why you might see a file in a NFS share where you seem to be the owner but still have no rights on - the user X locally is not (necessarily) the user X remotely.) Check this remote user if there are ulimits in place.

I hope this helps.

bakunin

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quotaon

QUOTAON(8)						    BSD System Manager's Manual 						QUOTAON(8)

NAME

     quotaon, quotaoff -- turn filesystem quotas on and off

SYNOPSIS

     quotaon [-g] [-u] [-v] filesystem ...
     quotaon [-g] [-u] [-v] -a
     quotaoff [-g] [-u] [-v] filesystem ...
     quotaoff [-g] [-u] [-v] -a

DESCRIPTION

     Quotaon announces to the system that disk quotas should be enabled on one or more filesystems.  Quotaoff announces to the system that the
     specified filesystems should have disk quotas turned off.	The filesystem must be mounted and it must have the appropriate mount option file
     located at its root, the .quota.ops.user file for user quota configuration, and the .quota.ops.group file for group quota configuration.
     Quotaon also expects each filesystem to have the appropriate quota data files located at its root, the .quota.user file for user data, and
     the .quota.group file for group data.  These filenames and their root location cannot be overridden.  By default, quotaon will attempt to
     enable both user and group quotas.  By default, quotaoff will disable both user and group quotas.

     Available options:

     -a      If the -a flag is supplied in place of any filesystem names, quotaon/quotaoff will enable/disable any filesystems with an existing
	     mount option file at its root.  The mount option file specifies the types of quotas that are to be configured.

     -g      Only group quotas will be enabled/disabled.  The mount option file, .quota.ops.group, must exist at the root of the filesystem.

     -u      Only user quotas will be enabled/disabled.  The mount option file, .quota.ops.user, must exist at the root of the filesystem.

     -v      Causes quotaon and quotaoff to print a message for each filesystem where quotas are turned on or off.

     Specifying both -g and -u is equivalent to the default.

     Quotas for both users and groups will automatically be turned on at filesystem mount if the appropriate mount option file and binary data
     file is in place at its root.

FILES

     Each of the following quota files is located at the root of the mounted filesystem.  The mount option files are empty files whose existence
     indicates that quotas are to be enabled for that filesystem.

     .quota.user       data file containing user quotas
     .quota.group      data file containing group quotas
     .quota.ops.user   mount option file used to enable user quotas
     .quota.ops.group  mount option file used to enable group quotas

SEE ALSO

     quota(1), quotactl(2), edquota(8), quotacheck(8), repquota(8)

HISTORY

     The quotaon command appeared in 4.2BSD.

4.2 Berkeley Distribution					 October 17, 2002					 4.2 Berkeley Distribution

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