Isso não parece ser sobre o espaço em disco, mas sobre arquivos que deveriam existir e não estão lá. Portanto, verifique a existência dos arquivos mencionados no log.
Estou recebendo este erro em um dos servidores
May 21 16:45:42 ERPSSO gconfd (root-24528): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 21 16:45:42 ERPSSO gconfd (root-24528): Failed to sync one or more sources: Failed to write some configuration data to disk
May 21 17:45:42 ERPSSO gconfd (root-24528): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 21 17:45:42 ERPSSO gconfd (root-24528): Failed to sync one or more sources: Failed to write some configuration data to disk
May 21 19:45:42 ERPSSO gconfd (root-24528): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 21 19:45:42 ERPSSO gconfd (root-24528): Failed to sync one or more sources: Failed to write some configuration data to disk
May 21 20:45:43 ERPSSO gconfd (root-24528): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 21 20:45:43 ERPSSO gconfd (root-24528): Failed to sync one or more sources: Failed to write some configuration data to disk
May 21 22:45:42 ERPSSO gconfd (root-24528): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 21 22:45:42 ERPSSO gconfd (root-24528): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 00:45:43 ERPSSO gconfd (root-23938): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 22 00:45:43 ERPSSO gconfd (root-23938): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 02:45:42 ERPSSO gconfd (root-23938): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 22 02:45:42 ERPSSO gconfd (root-23938): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 04:45:43 ERPSSO gconfd (root-23938): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 22 04:45:43 ERPSSO gconfd (root-23938): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 05:45:42 ERPSSO gconfd (root-23938): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 22 05:45:42 ERPSSO gconfd (root-23938): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 06:45:42 ERPSSO gconfd (root-23938): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 22 06:45:42 ERPSSO gconfd (root-23938): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 07:45:43 ERPSSO gconfd (root-23938): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 22 07:45:43 ERPSSO gconfd (root-23938): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 09:45:43 ERPSSO gconfd (root-23938): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 22 09:45:43 ERPSSO gconfd (root-23938): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 10:45:43 ERPSSO gconfd (root-23938): Failed to write "/root/.gconf/apps/puplet/%gconf.xml": Failed to move temporary file "/root/.gconf/apps/puplet/%gconf.xml.new" to final location "/root/.gconf/apps/puplet/%gconf.xml": No such file or directory
May 22 10:45:43 ERPSSO gconfd (root-23938): Failed to sync one or more sources: Failed to write some configuration data to disk
May 22 11:37:05 ERPSSO gconfd (root-7876): starting (version 2.14.0), pid 7876 user 'root'
May 22 11:37:05 ERPSSO gconfd (root-7876): Resolved address "xml:readonly:/etc/gconf/gconf.xml.mandatory" to a read-only configuration source at position 0
May 22 11:37:05 ERPSSO gconfd (root-7876): Resolved address "xml:readwrite:/root/.gconf" to a writable configuration source at position 1
May 22 11:37:05 ERPSSO gconfd (root-7876): Resolved address "xml:readonly:/etc/gconf/gconf.xml.defaults" to a read-only configuration source at position 2
Há espaço suficiente em root / boot / e outras partições