Backup Fails

Dear all,

I performed backup of databases in Database Servers but Today when I'm
going to backup of one of databases , the following error occurs :

[root@s8-mysd-2 8.4SS]# bin/pg_dump -Upostgres -i -o pdc_uima_olap |
gzip -c > /hdd4-1/pdc_uima_olap108feb18.sql.gz
Password:
pg_dump: [archiver (db)] connection to database "pdc_uima_olap" failed:
FATAL: could not write init file
[root@s8-mysd-2 8.4SS]#

Don't know the actual reason of this as remainning databases are backed
up correctly.

Please guide with some suggestion to overcome it.

Thanks & best Regards,
Adarsh Sharma