home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.arch.storage
- Path: sparky!uunet!stanford.edu!ames!riacs!viking.arc.nasa.gov!lamaster
- From: lamaster@viking.arc.nasa.gov (Hugh LaMaster -- RCS)
- Subject: Archive servers
- Message-ID: <1992Aug20.203645.22033@riacs.edu>
- Keywords: AFS, DFS, NFS, archival, Unix
- Sender: news@riacs.edu
- Organization: RIACS, NASA Ames Research Center
- References: <1992Aug20.183037.29264@jpl-devvax.jpl.nasa.gov>
- Date: Thu, 20 Aug 92 20:36:45 GMT
- Lines: 66
-
- What, if any, functional systems available today, which meet most
- or all of the following characteristics:
-
- Have a robust/reliable/bet-the-company on it file migration/archival
- system which appears to be a standard unix file system, and which can
- migrate individual files or groups of files to high density secondary
- storage.
-
- - Transparent handling of online disk, rapid access media such as
- tape cartridges, offline media, and high density, slow access
- media such as optical tape
- - Programmable migration policy, such as:
- - Archive on age*size priority
- - Delay archival of small files
- - Delay archival of directories
- - Archive directories of small files together
- - Prefetch directories of small files together
- - Scales to millions (billions and billions?) of small files
- - Supports typical small file access rates scaled appropriately
- to the amount of storage involved
- - Small files intermixed with very large (Gigabyte+) files
- - Can support either a global name space, a per-system name space,
- or intermixed
- - Can support Terabyte+ sized online storage, Petabyte (sp? 10^^15)
- sized offline storage (at least theoretically - access might be slow)
- - Can support thousands of online and offline secondary storage media
- (e.g. thousands of cartridges)
- - Fully integrated with multiple available networked file systems,
- especially NFS, AFS/DFS, and "local" protocols (e.g r-commands).
- - Supports current levels of network security (e.g. Secure NFS,
- DFS security extensions, ACLs, government "orange book"
- Multilevel Security) which current O/S's support
- - Data rates of up to 10 MBytes/sec supported by the system on
- individual file transfers if the media and networks also support
- such data rates, on both reads and writes, for large files
- - Intelligent directory handling so that file name lookups are not
- the bottleneck. Directory scheme not necessary Berkeley FFS based,
- although it could be.
- - Available on multiple platforms, and scalable, from small servers
- with ~10GBytes online disk storage, to very large systems with
- Terabytes of online disk and Petabytes (sp?) of archival storage
- - Multilevel hierarchy of archival supported (e.g. archive files on
- a distributed server to a backup central archival server
- - Duplication/backup/mirroring available in some form so that
- designated files can be duplicated in two physical locations
-
-
- OK, I know there is NOTHING out there today which can do ALL of this, but,
- how close are commercial products and academic or government projects
- to meeting these requirements?
-
- Example:
-
- Cray DMF on a Cray Unicos system might seem to meet robustness, data rate,
- and large file handling, but probably can't handle millions or billions
- of small files, among other things in the list.
-
- How close do other hardware/software systems come to meeting these
- criteria?
-
-
- --
- Hugh LaMaster, M/S 233-9, UUCP: ames!lamaster
- NASA Ames Research Center Internet: lamaster@ames.arc.nasa.gov
- Moffett Field, CA 94035-1000 Or: lamaster@george.arc.nasa.gov
- Phone: 415/604-1056 #include <usenet/std_disclaimer.h>
-