Replication Server stores messages, such as replicated transactions, on disk in stable queues. Disk space for the queues is allocated from disk partitions you create. A disk partition can be a raw disk partition or an operating system file.
You must allocate a disk partition of at least 20MB for each Replication Server you install. You can add more partitions later if necessary. Check each partition to make sure that it is available and that the “sybase” user can write to it. To use an operating system file for a partition, create an empty file. Verify that there is enough space on the file system for Replication Server to extend the file to full partition size.
See Replication Server Installation Guide > Before You Begin > Planning Your Installation > System Requirements.