[Gluster-devel] Client side afr versus server side, doing a self-heal

[Brandon Lamb]

On Thu, May 1, 2008 at 11:01 AM, Christopher Hawkins
<chawkins at veracitynetworks.com> wrote:
> I think a little documentation there would be fantastic. I am also starting
> with a full set of files that cannot be easily copied (a shared root... It
> kind of has to be there already, by definition!).
>
> Personally I was in the dark about all this until recent threads started
> shedding a little light on how versioning worked, and didn't even have my
> filesystem mounted with extended attributes enabled. Centos by default does
> not use them if you don't enable SE Linux and I had to go into fstab and
> change my root filesystem like so:
>
> /dev/VolGroup00/LogVol00 /                       ext3    defaults
>
> To:
>
> /dev/VolGroup00/LogVol00 /                       ext3    defaults,user_xattr
>
> And then remount it. I'm thinking about writing some scripts that will check
> for files that have gluster attributes and files that don't, and that will
> take some options for how to make everything right. Let's keep this thread
> going until we all understand the best way(s) to handle pre-existing data
> and then I'll post up whatever automation I can cobble together.
>
> Any other gotchas with pre-existing data? Gordan, you said you thought it
> was too dangerous and opted against it. What kind of safeguards do you think
> would make this safer?
>
> Chris
>
>
> > So in my case where i have one directory with existing data
> > and another that is empty, should i set the trusted version
> > to 1 on the pre existing data and 3 on the empty directory?
> > Or am I totally missing what this does?
> >
> > I agree starting with a clean slate is much easier/cleaner.
> > But when you have 100 gigs of data consisting of tons of tiny
> > files (web or mail data) it would be ideal to me anyway to be
> > able to use the existing directory and somehow tell glusterfs
> > that this is good data and that the empty directory is out of date.
> >
> > I guess this is more just a case of needing some
> > documentation on the proper steps and order of executing this
> > conversion?
> >
>
>
>
>
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One EVVVIL gotcha that got me was one of my servers did not have the
extended attributes flag turned on (xfs on both servers).

So I did the xfs command to set the attr thing to 2 (essentially
turning on ext attr) and yes it did warn me about needing to force it,
so heck i did!

Yea it formatted the file system. Good thing to know BEFORE hehe.

Just another lesson on HAVE A BACKUP.