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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
Old 11-14-2014
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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REPQUOTA(8)						    BSD System Manager's Manual 					       REPQUOTA(8)

NAME
repquota -- summarize quotas for a file system SYNOPSIS
repquota [-g] [-u] [-v] filesystem ... repquota [-g] [-u] [-v] -a DESCRIPTION
Repquota prints a summary of the disk usage and quotas for the specified file systems. Available options: -a Print the quotas of all the filesystems configured with a quota mount option file at its root. -g Print only group quotas (the default is to print both group and user quotas if they exist). -u Print only user quotas (the default is to print both group and user quotas if they exist). -v Print a header line before printing each filesystem quotas. For each user or group, the current number of files and amount of space (in kilobytes) is printed, along with any quotas created with edquota(8). Only members of the operator group or the super-user may use this command. 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), quotaon(8) DIAGNOSTICS
Various messages about inaccessible files; self-explanatory. HISTORY
The repquota command appeared in 4.2BSD. 4.2 Berkeley Distribution March 28, 2002 4.2 Berkeley Distribution
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