Re: Unable to authenticate after upgrading

From: Unruh (unruh-spam_at_physics.ubc.ca)
Date: 11/22/05 

Date: 22 Nov 2005 15:57:34 GMT

"Steve" <sbassle@alleghenyenergy.com> writes:

>I could only SEE the permissions when the filesystem was unmounted, but
>they still affected the permissions of the filesystem AFTER it was
>remounted. I know it makes no sense, and I would never have even
>considered it if I hadn't actually seen it before, when doing an
>upgrade of AIX using the alt_disk_install process. (For those
>unfamiliar with AIX, this allows you to "clone" the root drive to
>another drive and upgrade the cloned system, so you can subsequently
>boot to the alternate disk and minimize the downtime for the upgrade).
>During the initial cloning process, I need to be careful to set my
>umask back to the default 022, otherwise the cloned filesystems'
>permissions are affected and the system will not reboot. It drove me
>nuts until I unmounted the filesystems and saw that the mount point
>directories had no world read or execute access. One I set those bits,
>everything worked fine. Same thing here.

Yes, this is a famous problem with nfs and unix. BOTH the mount point's and
the mounted system's permissions are used to determine access. Of course the
mount point's permissions are invisible after the filesystem is mounted.

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