Does a video of a 3850 in operation exist ? On Thu, Dec 21, 2017 at 9:05 AM, Seymour J Metz <[email protected]> wrote:
> Well, the 2302 is based on the 1301 and 1302, which were common on the > 7000 series, but the only disks I've seen on 360s were 2305, 2311, 2314 , > 3330 and 3350. As I recall, 3330-11 and 3350 required a PRPQ. > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > > ________________________________________ > From: IBM Mainframe Discussion List <[email protected]> on behalf > of Anne & Lynn Wheeler <[email protected]> > Sent: Wednesday, December 20, 2017 4:52 PM > To: [email protected] > Subject: Re: Can anyone remember "drum" storage? > > [email protected] (Joel C. Ewing) writes: > > Clearly from the picture the Seagate really is like the 3380/3390 > > solution. Two completely independent actuators giving the appearance of > > two drives in one unit with a shared drive shaft and motor. The > > doubling of throughput is ONLY because you have two drives that can be > > accessing or preparing to access totally independent data at the same > > time, not because of any faster access to a block of data or multiple > > blocks of data on a single track of one of those devices. Dang! My > > interpretation would have been a much more intriguing device. > > recent ref > http://secure-web.cisco.com/1HwgxuCIVudwA-wXpve3Bf7rAOfMm6tHpHwbL3BNWr4T > xvKNnrnO0ZoWkiLG9ZqrqYSZlvXwX0rVEtRgCY5WUJlCWZXraQYaejh8i5e1Bzp0K- > yiwwuywQWkxwJX9hITxC2GQ6U_jSX_aPFCH4kNSqvsQQc8HsZRqwZN95S0wd > JOzyTM3QVyno8lUe4KP1TCgC0s8fhL1y8v32MF1pk7IHVO3dte3vchywpa9i > kUuhnx7r--98fsX2nSjSOSzm1_tsc2DdtLvSZ1zBekHchsQ2Eyszfn9o > 4P4o4bM4oDDfVofL4NyS_SCdKn2__p7m0nAiag4tSF_OAcccT1T5wmI8cIA1Gok1aJNCWHXQI > jL7qFjutWgc_i89ZOwrLLQc5G9jufrLtoLlP524PfmqkEzlHQsNsfLW9qz21TNli1nGN6zmQ > iDEvq9H7Y4gCwhHyqO/http%3A%2F%2Fwww.garlic.com%2F%7Elynn%2F2017k.html#22 > little old mainframes, Re: Was it ever worth it? > http://secure-web.cisco.com/1HwgxuCIVudwA-wXpve3Bf7rAOfMm6tHpHwbL3BNWr4T > xvKNnrnO0ZoWkiLG9ZqrqYSZlvXwX0rVEtRgCY5WUJlCWZXraQYaejh8i5e1Bzp0K- > yiwwuywQWkxwJX9hITxC2GQ6U_jSX_aPFCH4kNSqvsQQc8HsZRqwZN95S0wd > JOzyTM3QVyno8lUe4KP1TCgC0s8fhL1y8v32MF1pk7IHVO3dte3vchywpa9i > kUuhnx7r--98fsX2nSjSOSzm1_tsc2DdtLvSZ1zBekHchsQ2Eyszfn9o > 4P4o4bM4oDDfVofL4NyS_SCdKn2__p7m0nAiag4tSF_OAcccT1T5wmI8cIA1Gok1aJNCWHXQI > jL7qFjutWgc_i89ZOwrLLQc5G9jufrLtoLlP524PfmqkEzlHQsNsfLW9qz21TNli1nGN6zmQ > iDEvq9H7Y4gCwhHyqO/http%3A%2F%2Fwww.garlic.com%2F%7Elynn%2F2017k.html#44 > Can anyone remember "drum" storage? > > or ibm 2302 > IBM System/360 Component Descriptions- 2841 and Associated DASD > <a href="http://www.bitsavers.com/pdf/ibm/28xx/2841/GA26- > 5988-7_2841_DASD_Component_Descr_Dec69.pdf > > 2302 (never heard of any actually installed) pg59-63 (pg 59 picture > looks a little bit like the later 2305 fixed-head disk picture but not > fixed-head per track). has two access mechanism, one for the inner 250 > tracks and one for the outer 250 tracks (figure 46, pg 60) > > note that 2301 (fixed-head track) drum transferred four heads in > parallel for 1.2mbyte/sec transfer (compared to 2303 319kbyte/sec > transfer) and the 2305m1 transfered to heads in parallel for 3mbyte/sec > transfer compared to 1.5mbyte/sec 2305m2 (mod1 also had heads offset 180 > degrees on same track so it also cut avg. rotational delay in half ... > but mod1 physically had the same number of heads, so only had have the > tracks and half the capacity) > > -- > virtualization experience starting Jan1968, online at home since Mar1970 > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
