dove@rocket.UUCP (Webster Dove) (05/10/89)
Is there any faster large capacity storage that a Fujitsu 2380A parallel head 1Gbyte disk (15 Mbyte/sec) that could be used to store strictly sequential data? I am hoping for a moderately priced tape drive that I can easily interface to double-high VME. -- Dr. Webster Dove Computing Systems and Architectures Advanced Signal Processing Engineering (ASPEN) Dept. Sanders Associates (a Lockheed Company)
schultz@mmm.UUCP (John C Schultz) (05/11/89)
In article <DOVE.89May10131213@rocket.UUCP> dove@rocket.UUCP (Webster Dove) writes: >Is there any faster large capacity storage that a Fujitsu 2380A >parallel head 1Gbyte disk (15 Mbyte/sec) that could be used to store >strictly sequential data? A moderately priced disk drive maybe. Pretty high speed for tape. Anyway, I suggest that you contact some major image processing companies. The latest thing at the last trade show I was at was high performance disk drives with total capacity in the GB+ range. Data rates start at 10 MBytes/sec for about $25,000 depending on capacity. Be aware that image processing syste may impose format constraints on the data that may be unacceptable in you application. For example a standard image size is 0.25 MB which tends to be the storage size as well. Vendors that I can think of off the top of my head are Datacube, Vicom, Recognition Concepts, Inc., and Imaging Technology Inc. -- john c. schultz schultz@3M.Com ..!uiucuxc!mmm!schultz (612) 733-4047 3M Center, Bldg 518-1-1, St. Paul, MN 55144-1000 The opinions expressed herein are, as always, my own and not 3M's.
bart@videovax.tv.Tek.com (Bart Massey) (05/13/89)
In article <1264@mmm.UUCP> schultz@mmm.UUCP (John C Schultz) writes: *> In article <DOVE.89May10131213@rocket.UUCP> dove@rocket.UUCP (Webster Dove) writes: *> >Is there any faster large capacity storage that a Fujitsu 2380A *> >parallel head 1Gbyte disk (15 Mbyte/sec) that could be used to store *> >strictly sequential data? *> *> A moderately priced disk drive maybe. Pretty high speed for tape. This sounds like a made-to-order application for disk-striping. Should you be considering 10 100M drives? The most recent Usenix proceedings have some interesting articles on disk farms for UNIX systems... Bart Massey ..tektronix!videovax.tek.com!bart ..tektronix!reed.bitnet!bart
eugene@eos.UUCP (Eugene Miya) (05/14/89)
In article <5427@videovax.tv.Tek.com> bart@videovax.tv.tek.com (Bart Massey) writes: >In article <1264@mmm.UUCP> schultz@mmm.UUCP (John C Schultz) writes: >*> In article <DOVE.89May10131213@rocket.UUCP> dove@rocket.UUCP (Webster Dove) writes: >*> >Is there any faster large capacity storage that a Fujitsu 2380A >*> >parallel head 1Gbyte disk (15 Mbyte/sec) that could be used to store >*> >strictly sequential data? >*> >*> A moderately priced disk drive maybe. Pretty high speed for tape. > >This sounds like a made-to-order application for disk-striping. Should you >be considering 10 100M drives? The most recent Usenix proceedings have >some interesting articles on disk farms for UNIX systems... It's all tradeoffs by cost, (custom or otherwise), and requirements. There is the Cray SSD with GB/second transfers (and you get random access) and GW capacity, but it's no micro. And there is the TMC Data Vault. If you have to ask the price, you can't afford. Longish signature follows "Type 'n' now" Another gross generalization from --eugene miya, NASA Ames Research Center, eugene@aurora.arc.nasa.gov resident cynic at the Rock of Ages Home for Retired Hackers: "You trust the `reply' command with all those different mailers out there?" "If my mail does not reach you, please accept my apology." {ncar,decwrl,hplabs,uunet}!ames!eugene Live free or die.
warn@druhi.ATT.COM (WarnerD) (05/16/89)
In article <3615@eos.UUCP> eugene@eos.UUCP (Eugene Miya) writes: >In article <5427@videovax.tv.Tek.com> bart@videovax.tv.tek.com (Bart Massey) writes: >>In article <1264@mmm.UUCP> schultz@mmm.UUCP (John C Schultz) writes: >>*> In article <DOVE.89May10131213@rocket.UUCP> dove@rocket.UUCP (Webster Dove) writes: >>*> >Is there any faster large capacity storage that a Fujitsu 2380A >>*> >parallel head 1Gbyte disk (15 Mbyte/sec) that could be used to store >>*> >strictly sequential data? >>*> >>*> A moderately priced disk drive maybe. Pretty high speed for tape. >> >>This sounds like a made-to-order application for disk-striping. Should you >>be considering 10 100M drives? The most recent Usenix proceedings have >>some interesting articles on disk farms for UNIX systems... > >It's all tradeoffs by cost, (custom or otherwise), and requirements. >There is the Cray SSD with GB/second transfers (and you get random access) >and GW capacity, but it's no micro. And there is the TMC Data Vault. >If you have to ask the price, you can't afford. > >Longish signature follows "Type 'n' now" > >Another gross generalization from > >--eugene miya, NASA Ames Research Center, eugene@aurora.arc.nasa.gov > resident cynic at the Rock of Ages Home for Retired Hackers: > "You trust the `reply' command with all those different mailers out there?" > "If my mail does not reach you, please accept my apology." > {ncar,decwrl,hplabs,uunet}!ames!eugene > Live free or die. In a recent past life I was manager of software development for Seagate Technology's now deceased but possibly reincarnated (as Array Technology Corp.) disk array project located in Boulder, CO. We developed a prototype that was privately shown in a suite at Fall '88 Comdex. As a result, I'm partial to array architectures as a solution to high capacity, high reliability, high bandwidth, low cost storage. There are advantages inherent in arrays over single spindle PTD's such as Fuji or Ibis drives. This isn't a commercial (since the product is not now, and quite likely never will be sold - too bad!) but a brief description of the Seagate array's capabilities might be in order as a basis for comparison, etc. - up to 30GB in 3 19" racks; could be shrunk, "only" packaging - up to 30MB/sec net transfer rate to/from host - not many hosts can handle that but the array WON'T be the bottleneck - some awfully large MTBDL numbers (>1,000,000 hrs) given usual individual drive failure rates, the usual replacement assumptions, etc. - a cold sparing feature which, when combined with the two drive error correction, would allow three drives to fail before any data was inaccessible - a very flexible set of configuration options, i.e. virtual volume capacities, high transaction or high bandwidth mode, maintenance activities, usage statistics, etc. - approx. $7-$9/MB net "plug it into your system" cost - VME i/f was built but HyperChannel, HSC, ,IPI-3, FDDI things, etc were being investigated. I could go on for $'s and $'s on this topic, but ... I'd enjoy corresponding on this subject if anyone would care to.
lex@NRC.COM (Lex Mierop) (05/16/89)
In article <DOVE.89May10131213@rocket.UUCP> dove@rocket.UUCP (Webster Dove) writes: >Is there any faster large capacity storage that a Fujitsu 2380A >parallel head 1Gbyte disk (15 Mbyte/sec) that could be used to store >strictly sequential data? I believe Ibis Systems, Westlake CA may have an answer for you. 2+Gbyte, 24Mbyte/sec with a 6U VME interface board. Disclaimer: You didn't here it from me. -- Lex Mierop - Network Research | #include <cute_quote.h> Internet/uucp: lex@aztec.nrc.com| US Snail: 2380 Rose Avenue; Oxnard, CA 93030 U.S.A. tel. 805-485-2700