I think more context in necessary in order to offer advice. Can you please share some more info about your setup. Maybe start with what's producing the logs and why can't you run Filebeat locally? What OS?
Where is Filebeat running? I wouldn't expect any problems reading from ext4 or NTFS even if they are virtual or iSCSI disks.
But if I missed something in your architecture, an alternative could be to forward the syslog data to Logstash. We usually recommend this for OSes where Filebeat cannot be run (like AIX b/c Go isn't supported).
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