Sorry for not replying to the original thread, but I just joined this list.
On Tue, 13 May 2008, Rich Megginson wrote:
Has anyone seen these errors with 1.1? We fixed a few 64-bit
issues in 1.1.
I am running two 32-bit FDS 1.1 (fedora-ds-1.1.0-3.fc6) servers, on RHEL 5.1, in an MMR configuration. These servers, which are configured behind a load balancer, act as the University's central authentication service. We have are using the password policy plugin and have the "passwordisglobalpolicy" setting enabled, so there is a substantial amount of write activity due to replication of password- policy-related attributes (e.g., passwordRetryCount, retryCountResetTime, etc). Time on both systems is synchronized via NTP; clocks are in sync.
We have the same situation as Reinhard Nappert reported on 5/13/2008: MMR will work fine for a while (usually a few weeks; the longest period we've gone is a month, the shortest time a few hours). Eventually replication will fail with the following sequence of messages in the errors log:
[24/May/2008:05:18:54 -0700] - csngen_adjust_time: adjustment limit exceeded; value - 86401, limit - 86400 [24/May/2008:05:18:54 -0700] NSMMReplicationPlugin - conn=1800 op=60262 replica="<suffix>": Unable to acquire replica: error: excessive clock skew [24/May/2008:05:20:05 -0700] - csngen_adjust_time: adjustment limit exceeded; value - 86401, limit - 86400 [24/May/2008:05:20:05 -0700] NSMMReplicationPlugin - agmt="cn=kif2zapp" (zapp:389): Incremental protocol: fatal er ror - too much time skew between replicas! [24/May/2008:05:20:05 -0700] NSMMReplicationPlugin - agmt="cn=kif2zapp" (zapp:389): Incremental update failed and requires administrator action
The "csngen_adjust_time" error message always reports the same value when this occurs (86401).
We have also employed the workaround described by Chris St. Pierre in https://bugzilla.redhat.com/show_bug.cgi?id=233642 #c3. This resolves the problem for a short while, but it always reappears. BTW, I was in contact with Chris recently about his experiences with MMR and he said that, in addition to moving to FDS 1.1, he moved a lot of "frequently updated" data out of FDS and into MySQL, and that his problem disappeared afterward; obviously this isn't a solution for us as we are utilizing FDS as an authentication engine.
We are desperately trying to find a solution to this issue that will allow us to continue using MMR...we could resort to a traditional passive/active + shared storage HA design, but we want to keep that as a last resort. If there is any additional information I should provide, please let me know.
-- Gary Windham Senior Enterprise Systems Architect The University of Arizona, UITS +1 520 626 5981
Gary Windham wrote:
Sorry for not replying to the original thread, but I just joined this list.
On Tue, 13 May 2008, Rich Megginson wrote:
Has anyone seen these errors with 1.1? We fixed a few 64-bit issues
in 1.1.
I am running two 32-bit FDS 1.1 (fedora-ds-1.1.0-3.fc6) servers, on RHEL 5.1, in an MMR configuration. These servers, which are configured behind a load balancer, act as the University's central authentication service. We have are using the password policy plugin and have the "passwordisglobalpolicy" setting enabled, so there is a substantial amount of write activity due to replication of password-policy-related attributes (e.g., passwordRetryCount, retryCountResetTime, etc). Time on both systems is synchronized via NTP; clocks are in sync.
We have the same situation as Reinhard Nappert reported on 5/13/2008: MMR will work fine for a while (usually a few weeks; the longest period we've gone is a month, the shortest time a few hours). Eventually replication will fail with the following sequence of messages in the errors log:
[24/May/2008:05:18:54 -0700] - csngen_adjust_time: adjustment limit exceeded; value - 86401, limit - 86400 [24/May/2008:05:18:54 -0700] NSMMReplicationPlugin - conn=1800 op=60262 replica="<suffix>": Unable to acquire replica: error: excessive clock skew [24/May/2008:05:20:05 -0700] - csngen_adjust_time: adjustment limit exceeded; value - 86401, limit - 86400 [24/May/2008:05:20:05 -0700] NSMMReplicationPlugin - agmt="cn=kif2zapp" (zapp:389): Incremental protocol: fatal er ror - too much time skew between replicas! [24/May/2008:05:20:05 -0700] NSMMReplicationPlugin - agmt="cn=kif2zapp" (zapp:389): Incremental update failed and requires administrator action
The "csngen_adjust_time" error message always reports the same value when this occurs (86401).
We have also employed the workaround described by Chris St. Pierre in https://bugzilla.redhat.com/show_bug.cgi?id=233642#c3. This resolves the problem for a short while, but it always reappears. BTW, I was in contact with Chris recently about his experiences with MMR and he said that, in addition to moving to FDS 1.1, he moved a lot of "frequently updated" data out of FDS and into MySQL, and that his problem disappeared afterward; obviously this isn't a solution for us as we are utilizing FDS as an authentication engine.
We are desperately trying to find a solution to this issue that will allow us to continue using MMR...we could resort to a traditional passive/active + shared storage HA design, but we want to keep that as a last resort. If there is any additional information I should provide, please let me know.
I've attached a script to https://bugzilla.redhat.com/show_bug.cgi?id=233642 to help diagnose this problem.
-- Gary Windham Senior Enterprise Systems Architect The University of Arizona, UITS +1 520 626 5981
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