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Anonymous_User Absent Member.
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External / Distributed References


I have an "Identity Vault" where there are four "new" servers (eDir 8.8
SP8 v20801.42) and two "old" servers (eDir 8.8 SP6 v20604.10). All
replicas have been removed from the two old servers and all the new
servers have replicas of all partitions. This tree currently contains a
little over 702,500 objects, mostly users. Both of the old servers did
once host Identity Manager, but haven't in well over a year.

My problem: I am preparing to deconfigure the two old servers, but I
found backlink entries from nearly every object in the tree to both of
the old servers. When I deconfigure each of those two servers, eDir is
going to have to remove all those backlink entries, which I believe will
cause performance issues (changing 700,000+ objects all at once).

My question: Can I safely remove those backlink entries (using LDAP)
before I deconfigure those two old servers?

Related question: Does eDir 8.8.6+ use ObitUsedBy, usedBy, or backLink
attributes for anything at all now? Can I safely delete all values of
each of these attributes (again, using LDAP)?


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yancey
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Anonymous_User Absent Member.
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Re: External / Distributed References

On Mon, 18 Nov 2013 20:24:01 +0000, yancey wrote:

> My problem: I am preparing to deconfigure the two old servers, but I
> found backlink entries from nearly every object in the tree to both of
> the old servers. When I deconfigure each of those two servers, eDir is
> going to have to remove all those backlink entries, which I believe will
> cause performance issues (changing 700,000+ objects all at once).


I'd expect a performance hit while this is cleaned up, yes.


> My question: Can I safely remove those backlink entries (using LDAP)
> before I deconfigure those two old servers?


I'll defer to Aaron's opinion here, but I don't think that's going to
work.


> Related question: Does eDir 8.8.6+ use ObitUsedBy, usedBy, or backLink
> attributes for anything at all now? Can I safely delete all values of
> each of these attributes (again, using LDAP)?


Generally, I wouldn't mess with any of those. I know they've made a bunch
of changes in eDir 8.8.8 to be much more efficient, and faster, about
handling large numbers of deleted objects and obit processing.


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Anonymous_User Absent Member.
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Re: External / Distributed References

On Mon, 18 Nov 2013 20:24:01 +0000, yancey wrote:

> My question: Can I safely remove those backlink entries (using LDAP)
> before I deconfigure those two old servers?


I wouldn't touch them. They were put there for a reason, and using LDAP
to "clean them up" will likely cause more problems than trying to clean
them up will solve.

If you identify the reason why they're present on the server and remove
that reason, then they would automatically be cleaned up - eventually.

> Related question: Does eDir 8.8.6+ use ObitUsedBy, usedBy, or backLink
> attributes for anything at all now? Can I safely delete all values of
> each of these attributes (again, using LDAP)?


I wouldn't touch any of those attributes via LDAP - IMHO that's just
asking for trouble when you decommission the old servers.

It will take some time to clean them up when you remove the servers, yes
- but I'm going to go out on a limb here and say that the impact probably
won't cause you much trouble. David or AB might have more experience
with larger numbers of extrefs, though, and I'd be interested in hearing
their experiences.

Jim



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Jim Henderson, CNA6, CDE, CNI, LPIC-1, CLA10, CLP10
Novell/SUSE/NetIQ Knowledge Partner
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Anonymous_User Absent Member.
Absent Member.

Re: External / Distributed References

On Tue, 19 Nov 2013 00:06:29 +0000, Jim Henderson wrote:

> It will take some time to clean them up when you remove the servers, yes
> - but I'm going to go out on a limb here and say that the impact
> probably won't cause you much trouble. David or AB might have more
> experience with larger numbers of extrefs, though, and I'd be interested
> in hearing their experiences.


Basically, servers get busy, performance slows down a bit for a while,
then things recover. How long "a while" is depends on the servers. In
most environments, you probably won't notice. In this one, with that many
objects, maybe, depending on how busy it is. I'd do it during off hours
if the normal load is heavy.


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Anonymous_User Absent Member.
Absent Member.

Re: External / Distributed References

On Tue, 19 Nov 2013 16:00:02 +0000, David Gersic wrote:

> On Tue, 19 Nov 2013 00:06:29 +0000, Jim Henderson wrote:
>
>> It will take some time to clean them up when you remove the servers,
>> yes - but I'm going to go out on a limb here and say that the impact
>> probably won't cause you much trouble. David or AB might have more
>> experience with larger numbers of extrefs, though, and I'd be
>> interested in hearing their experiences.

>
> Basically, servers get busy, performance slows down a bit for a while,
> then things recover. How long "a while" is depends on the servers. In
> most environments, you probably won't notice. In this one, with that
> many objects, maybe, depending on how busy it is. I'd do it during off
> hours if the normal load is heavy.


That's about what I would expect - not the sort of performance hit that
knocks users off the network or prevents logins. I agree off-hours would
be best - start on a Friday evening, maybe.

Jim



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Jim Henderson, CNA6, CDE, CNI, LPIC-1, CLA10, CLP10
Novell/SUSE/NetIQ Knowledge Partner
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