Restoring ldap fails

Restoring LDAP fails

   KB 22709        Last updated on 06/7/2016  




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Problem


Trying to restore ldap with zmslapadd terminates with the following error:

$ /opt/zimbra/libexec/zmslapadd /tmp/ldap.bak
/opt/zimbra/libexec/zmslapadd: line 17: ulimit: core file size: cannot modify limit: Operation not permitted
555c9803 => mdb_tool_next_id: dn2id_add failed: MDB_MAP_FULL: Environment mapsize limit reached (-30792)
555c9803 => mdb_tool_entry_put: txn_aborted! MDB_MAP_FULL: Environment mapsize limit reached (-30792)
slapadd: could not add entry dn="cn=lpn-prd-mstr034.prosodie,cn=servers,cn=zimbra" (line=9786): txn_aborted! MDB_MAP_FULL: Environment mapsize limit reached (-30792)
_ 0.01% eta 09m26s elapsed none spd 13.4 M/s
Closing DB...

Resolution


To fix the issue we need to set the ldap_db_maxsize attribute to its default setting:

zmlocalconfig -e ldap_db_maxsize=85899345920


After changing the attribute repeat the operation again.


Additional Information


Over time, depending on write activity, which is unique to every client, the MDB database will suffer from fragmentation. During the write process, mdb tries to reuse locations that were previously freed by delete activity. Essentially, a write can come in, that is just a "wrong" size. In this case MDB tries repeatedly to find an open slot in the approximately 4 million empty slots currently available in the database. This causes slapd to block write requests. The fix for this issue is to dump the LDAP database and reload it.

To accomplish that, as the zimbra user:

ldap stop
/opt/zimbra/libexec/zmslapcat /tmp (or other good location)
cd /opt/zimbra/data/ldap
mv mdb mdb.backup
mkdir -p mdb/db
cd ~
/opt/zimbra/libexec/zmslapadd /tmp/ldap.bak
ldap start


Verified Against: Zimbra Collaboration 8.6, 8.5, 8.0 Date Created: 06/07/2016
Article ID: https://wiki.zimbra.com/index.php?title=Restoring_ldap_fails Date Modified: 06/7/2016



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Wiki/KB reviewed by SME1 SME2 COPY EDITOR Last edit by Teodor Vizirov
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