[OpenAFS] Read-only volume issues

Mon, 20 Jun 2016 16:20:39 -0400

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On 6/20/2016 4:10 PM, Garrison, Christine wrote:
> Hi Jeff,
>=20
> Does "vos addsite" duplicate a volume's data?=20

=46rom an implementation perspective a .readonly instance on the same
partition as the RW volume is identical to a .backup.  The difference
is that the .readonly is stable and mount points behave the way you
want them to and .backup volume instances are unstable.

If you move the volume the .backup will be destroyed whereas the
=2Ereadonly will remain.

> Because we are using much more than half our capacity, and therefore ca=
n't afford to double usage.=20
> To be blunt, we are trying to make the system read only by stages to
encourage users to migrate off this system as we are trying to retire it
at the end of the year.

I assumed that is what you were trying to do.

> If mounting the .backup volume isn't a good option, then that more or l=
ess leaves me with walking the filesystem, parsing and changing ACLs to h=
ave no write/insert/delete.
> This would be irreversible unless I stored the original ACL states
somehow and could re-apply them later if there was a mistake or a
political reason to restore a volume to be writeable for awhile.
>=20
> Though, I am open to ideas. It seems awful to ask about how to retire a=
n OpenAFS system on this list, however.

The approach I have suggested will do what you need.

>> What are the errors?   Obviously, any access that expects write permis=
sion or the ability to obtain a lock is going to fail when the volume isn=
't writable.
>=20
> Well the errors indicate the files can't even be read, despite that not=
 being the case (at least, it works fine within OpenAFS and with the sftp=
 and http gateways we have sitting on top... just not Samba.
>=20
> OS X at least says:
>=20
> "The document =E2=80=9CDocument.rtf=E2=80=9D could not be opened."
>=20
> ...and if I copy to the desktop, it says:
>=20
> "The Finder can=E2=80=99t complete the operation because some data in =E2=
=80=9CDocument.rtf=E2=80=9D can=E2=80=99t be read or written.
> (Error code -36)"

You are looking in the wrong place for errors.   You need to be looking
at Samba.

Jeffrey Altman

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n:Altman;Jeffrey
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email;internet:jaltman@auristor.com
title:Founder and CEO
tel;work:+1-212-769-9018
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