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Electronic Mail <br />sendmail <br />Electronic mail (E-mail) is implemented at RTi using the mail transport agent (MTA) <br />elm <br />program and its associated configuration files. RTi is currently using the public domain <br />program as its mail user agent (MUA) program because it is straightforward to use, and it allows PC <br />users to view mail without having to use a graphics-based X Window System emulation package. <br />RTi has set up a mail alias list for persons involved with CRDSS an d has distributed the list to team <br />members. All team members have E-mail accounts at their respective locations. <br />E-mail will be used internally by the project team for technical and managerial correspondence. E- <br />mail may also be used to distribute documents to end-users and developers (see Task Memoranda <br />1.05-1 and 1.05-10). <br />Shared Disk Resources <br />Disk resources will be shared using the Network File System (NFS) as described in Task <br />Memorandum 1.05-25. This involves allowing one machine to locally mount a disk from a remote <br />machine. In such a configuration, the local machine appears to the user to have much more disk <br />space than it actually does. This software also allows users to transparently access files on different <br />machines by changing directories on the local machine. NFS will be used extensively within RTi <br />and also to allow State and CSU machines to access disks at RTi. <br />Shared Devices <br />Devices such as CD-ROMs and tape drives will be shared by depending on NFS and SGI software. <br />Because NFS allows disks to be cross-mounted, "global" directories can be created so that a "hard" <br />directory on one machine can be exported to other machines. For example, a CD-ROM device that is <br />mounted on one workstation on directory can be made available to other machines by using <br />/cdrom <br />NFS. A remote machine can then treat as if it were connected to that machine. <br />/cdrom <br />Tape drives can be used similarly in that the machine to which the tape drive is physically connected <br />can be accessed by other machines using NFS. In such a configuration, writing from a tape to disk <br />on one machine may actually result in files being written to a remote machine. Backups on remote <br />directories can also be performed by depending on NFS. Additionally, remote backups can be <br />rsh <br />performed without NFS by using standard UNIX "remote" commands such as . <br />File Transfer <br />Data for the CRDSS (e.g., historical data) will be collected using the Internet file transfer <br />mechanisms if possible because such transfers are fast (faster than shipping a tape) and convenient <br />(files are transferred straight to a machine's disk, rather than having to be loaded from tape). Internet <br />transfers will only be possible for data source sites that have an Internet connection. <br />ftp ftp <br />The method of transfer will generally be the UNIX program. An anonymous space will be <br />created on a CRDSS machine at RTi so that sources of data can provide data at their convenience. <br />ftp ftp <br />RTi team personnel will actively retrieve data using when anonymous is available at data <br />source sites. <br />2 <br />A275 05.10.94 1.05-19 Malers <br />