Editing OpenVMS (section)

===File system===
{{Main|Files-11|Record Management Services}}
The typical user and application interface into the [[file system]] is the [[Record Management Services]] (RMS), although applications can interface directly with the underlying file system through the [[QIO]] system services.<ref name="acp-qio-doc">{{cite web|url=https://vmssoftware.com/docs/VSI_IO_REF.pdf|title=VSI OpenVMS I/O User's Reference Manual|date=August 2019|access-date=January 13, 2021|publisher=VSI}}</ref> The file systems supported by VMS are referred to as the [[Files-11]] ''On-Disk Structures'' (ODS), the most significant of which are ''ODS-2'' and ''ODS-5''.<ref name="andy-goldstein-files-11">{{cite web|url=https://www.youtube.com/watch?v=b0YenelPw-Y| archive-url=https://web.archive.org/web/20210112225121/https://www.youtube.com/watch?v=b0YenelPw-Y| archive-date=January 12, 2021 | url-status=dead|title=Andy Goldstein on Files-11, the OpenVMS File Systems|date=July 25, 2019|access-date=January 3, 2021|publisher=VSI Official Channel}}</ref> VMS is also capable of accessing files on [[ISO 9660]] [[CD-ROM]]s and [[magnetic tape]] with [[Tape labels#ANSI tape labels|ANSI tape labels]].<ref>{{cite web|url=https://vmssoftware.com/docs/VSI_Gd_to_File_Apps_23Jul19.pdf|title=VSI OpenVMS Guide to OpenVMS File Applications|publisher=VSI|date=July 23, 2019|access-date=January 13, 2021}}</ref>

Files-11 is limited to 2 TiB volumes.<ref name="andy-goldstein-files-11" /> DEC attempted to replace it with a [[log-structured file system]] named Spiralog, first released in 1995.<ref name="Why was Spiralog retired">{{cite web|url=https://community.hpe.com/t5/Operating-System-OpenVMS/Why-was-Spiralog-retired/td-p/4951205|title=Why was Spiralog retired?|date=January 10, 2006|access-date=January 13, 2021|website=Hewlett Packard Enterprise Community - Operating System - OpenVMS}}</ref> However, Spiralog was discontinued due to a variety of problems, including issues with handling full volumes.<ref name="Why was Spiralog retired"/> Instead, there has been discussion of porting the open-source GFS2 file system to OpenVMS.<ref name="september-2020-roadmap">{{cite web|url=https://vmssoftware.com/pdfs/VMS_Software_Roadmap_2020.pdf|archive-url=https://web.archive.org/web/20201207040724/https://vmssoftware.com/pdfs/VMS_Software_Roadmap_2020.pdf|archive-date=December 7, 2020|url-status=dead|title=VSI OpenVMS Software Roadmap 2020|access-date=September 23, 2020|date=September 2020}}</ref>