couchbase server install fails on centos 6 machines

Tried installing the couchbase server on centos 6 machines. It failed on some of the machines with the following error. 

Error looks similar to MB-6615. But I don't see any issue with the space here.

[root@localhost ~]# uname -a

Linux localhost.localdomain 2.6.32-573.7.1.el6.x86_64 #1 SMP Tue Sep 22 22:00:00 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

[root@localhost ~]# cat /etc/*-release

CentOS release 6.7 (Final)

LSB_VERSION=base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch

CentOS release 6.7 (Final)

CentOS release 6.7 (Final)

[root@localhost ~]# df -kh

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroup-lv_root

                       43G  1.3G   40G   4% /

tmpfs                 1.9G     0  1.9G   0% /dev/shm

/dev/xvda1            477M   76M  376M  17% /boot

[root@localhost ~]# rpm -i /tmp/couchbase-server-enterprise-5.0.0-2079-centos6.x86_64.rpm

rpmdb: Thread/process 3605/139769475061664 failed: Thread died in Berkeley DB library

error: db3 error(30974) from dbenv>failchk: DB_RUNRECOVERY: Fatal error, run database recovery

error: cannot open Packages index using db3 -  (-30974)

error: cannot open Packages database in /var/lib/rpm

rpmdb: Thread/process 3605/139769475061664 failed: Thread died in Berkeley DB library

error: db3 error(30974) from dbenv>failchk: DB_RUNRECOVERY: Fatal error, run database recovery

error: cannot open Packages database in /var/lib/rpm

[root@localhost ~]# free -km

             total       used       free     shared    buffers     cached

Mem:          3880        827       3053          0        283        382

-/+ buffers/cache:        161       3719

Swap:         3951          0       3951

[root@localhost ~]#