Hi Becky,
You're exactly right, both of the artifacts (bugs really) are just in
the pfs2-xattr program. We should fix that tool, but in general,
you're probably better off doing testing with the lsattr and chattr
linux utilities. Those will let you set the append and noatime attrs
on the same file.
The lsattr and chattr utils can only be run as root. Also, keep in
mind that once the immutable or append attributes are placed on a
file, they can't be removed. At this point it looks like its not
possible to upgrade a file from append to immutable (perhaps a bug on
the PVFS server). In order to remove the attributes, the entire file
must be deleted. The noatime attr can be removed at any point.
-sam
On Nov 10, 2008, at 8:59 AM, Becky Ligon wrote:
Hello to all:
I am adding a "mirror" capability to PVFS2 and am using the setting
of the
immutable flag as the event in which a copy(ies) of the file is
created...just as a start. I am new at this game and need some help!
I have been using the pvfs2-xattr program to understand how the
immutable
flag behaves and would like someone to confirm or clarify the behavior
that I am seeing. My observations:
1. immutable, append, and noatime appear to be mutually exclusive
characteristics. This makes sense to me with the exception that
noatime
would seem to apply to either immutable or append files. Thus, if you
turn on one characteristic, the other two are turned off. Is this
behavior expected? Or, is this behavior simply a product of the
pvfs2-xattr program?
2. When you turn off ANY of the three characteristics, then NONE of
the
three characteristics are turned on. For example, if you have
immutable
turned on and then you turn off append, then the result is that
immutable
is turned off. Is this a defect with pvfs2-xattr? Shouldn't
immutable
only be turned off IFF the immutable option was turned off?
If someone can clarify what I'm seeing, I would appreciate it.
Thanks,
Becky Ligon
--
Becky Ligon
PVFS Developer
Clemson University
864-656-3865
--
Becky Ligon
PVFS Developer
Clemson University
864-656-3865
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