disk i/o: very high write rates

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Hi all,

I'm running a set of three 389-ds servers with about 50 databases with
replication on each server.

No I'm encounter a constant very hight disk write rate (about 300 write
io/sec.).

In the audit-log there is nothing what would explain this. But in iotop
I see a lot of threads like:

 1621 be/4 dirsrv      0.00 B/s    3.95 K/s  0.00 %  0.46 % ns-slapd -D
/etc/dirsrv/slapd-ldap0 -i /var/run/dirsrv/slapd-ldap0.pid -w
/var/run/dirsrv/slapd-ldap0.startpid
 1628 be/4 dirsrv      0.00 B/s    7.90 K/s  0.00 %  0.46 % ns-slapd -D
/etc/dirsrv/slapd-ldap0 -i /var/run/dirsrv/slapd-ldap0.pid -w
/var/run/dirsrv/slapd-ldap0.startpid

....

 1631 be/4 dirsrv      0.00 B/s  892.18 K/s  0.00 %  0.00 % ns-slapd -D
/etc/dirsrv/slapd-ldap0 -i /var/run/dirsrv/slapd-ldap0.pid -w
/var/run/dirsrv/slapd-ldap0.startpid
 1463 be/4 dirsrv      0.00 B/s  580.31 K/s  0.00 %  0.00 % ns-slapd -D
/etc/dirsrv/slapd-ldap0 -i /var/run/dirsrv/slapd-ldap0.pid -w
/var/run/dirsrv/slapd-ldap0.startpid
 1462 be/4 dirsrv      0.00 B/s  363.19 K/s  0.00 %  0.00 % ns-slapd -D
/etc/dirsrv/slapd-ldap0 -i /var/run/dirsrv/slapd-ldap0.pid -w
/var/run/dirsrv/slapd-ldap0.startpid

I configured caching and have entrycachehits about 99 - but anyway this
would have only impact to read-operations.
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