It turns out that it's the 3380 that has a model, CJ2, for direct attach to the channel. They say that the memory is the second thing to go.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Joe Monk <joemon...@gmail.com> Sent: Saturday, May 18, 2019 6:45 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Ancient DASD connectivity The 3375 (CKD brother of the 3370 FBA) was attached thru a 3880 storage control. There were A,B, and D units. The D units were the tails and the A units were the heads. The D units provided a second path but couldnt be attached to the same 3880 as the A unit of the string, nor could that 3880 be attached to the same channel as the 3880 of the A unit. Joe On Fri, May 17, 2019 at 3:56 PM Seymour J Metz <sme...@gmu.edu> wrote: > 3350 models C2 and C2F were tail of string units. As I recall, for 3375 > the C boxes included a control unit so it could attach directly to the > channel. > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > > ________________________________________ > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf > of Martin Packer <martin_pac...@uk.ibm.com> > Sent: Friday, May 17, 2019 10:33 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: Ancient DASD connectivity > > And then there were double-ended strings of disks. 3350s? Just before my > time, really. > > Martin Packer > > zChampion, Systems Investigator & Performance Troubleshooter, IBM > > +44-7802-245-584 > > email: martin_pac...@uk.ibm.com > > Twitter / Facebook IDs: MartinPacker > > Blog: > > https://secure-web.cisco.com/1zkSbtFDHOQs-i0S-NWG9whv4u3IVZLV4iwAsKJoL2wW0OBmxiXP49rPpM1hT28C5b05szJKbesmdCwEEpD05FwEH50B6ARq7H4b8Zh6IJr0tPsuzoBPiFXQPDfQxYaPQYvyOvy4G4ln6n4_9ms5P4hMeiNmq_UYxcH9QVEOrWeEbnycJFVTjqY_VuZ2F1xvASndlQXGyymvVCnHH2aIspYvzxF-0v8HOHELGUtxn0k3au6EUwcA6JbLaxD8trjCjyKkhMbn2UTBk5SPRnwKUsrJkFPfKX_m0eFWLqK4Dpf_7hxz6bRU96J927VJx72fgLXSwle86AKD9TflIwL0F5YWlHRJ4iU607AikyfCE2ITitcGvm3snmAwlVhIt26GhilCuUJS5OFV9C9IrAF0iI3FXKM55EISaE0TLMl0ogj_jVq_hpJg6Cv8d12MymWJX/https%3A%2F%2Fwww.ibm.com%2Fdeveloperworks%2Fmydeveloperworks%2Fblogs%2FMartinPacker > > Podcast Series (With Marna Walle): > https://secure-web.cisco.com/17KFRTNtw8jfbbM3KsapTPl1kUL2e-A2T3RRirEQef-5zKhaDfIaoQ_kHlL0yVxsqdBBDxqf9CXdbupf2MnBsASYjnviXkJ9jRWLAC5v943HBI13uSh2iuQmpypV1xgZcxrt5ebRbKLdQZkY_BNXmjANax89CByWOJP7STOCVY7uwa6DHHuPGSLwwPa2dMb94riZ72R-fmAnpuWeGC01zG7qlp9uerNzhLgGHKIeQIEUPzm6gaNIXoTcPo4iLXm9wnlXFL-7ZJ91d7Bzjl7dJYj5fgHRjrSc0CaBv4OfZJ4BTd8akyp4TwyEpa8bUwDbqMIhtipc7LGiitUrTVmSzhK3vt2ZgiEt_nyHFFW42RBrSul6uEtbZKEdjmChauSiicHsmtpqltjfyEkP71GopsRXX0jJqxdXhZLnhnW6ekDnCO3tf05rhz_nSlVpPGA7Y/https%3A%2F%2Fdeveloper.ibm.com%2Ftv%2Fmpt%2F > or > > > https://secure-web.cisco.com/1pQriJXHvVuThP0MiibJcjZPe99XVSGA8WIXKQWnnbEK60K2jHF9_I_b5NcG8qrUysHmYu4IaCDP9G2UOzIqYQUb7dBLJ02sIhkPnPIakC2kn4HehGcYblVT2oM6DfmZviasdke8CJiDf1YWoOcHZdDS5foOvVkuR7k9zEwD_fb-Kegv_pXrdLjF6BSSzoI98D4xr8xCUw-zjIFjew3TUxeZhkFlrIJerjVQaoNdWOo7CzKEkrgRzh-UuK_7_76_HY7Kh2aBn63ONaxP2Nt-2CNwKf_QPi2y4-IySqKvp7KyrcYDPu33ivqtcnHxuFp9UvxEzbKILV-2b_IqVhq08fqsDdvYBQyxZrP-XHsx7-pqmtWJTJQk71WA5nugG5ZtJBbmjkiHHd-MgjaS82K7xVnfY3FNi0mZsGjMIX4b909pJHeTJnu0HMU-OIEpwGDJl/https%3A%2F%2Fitunes.apple.com%2Fgb%2Fpodcast%2Fmainframe-performance-topics%2Fid1127943573%3Fmt%3D2 > > > Youtube channel: > https://secure-web.cisco.com/1-SK3lE2EgsiE4OF0AoD5ULNOh2Fz_tyO-k4W60ndX3c6VFQjlBkkxbpfn4MpvEIaSlm5GI7vZ29LRnhBlFYkgmQZO3tJHPC_ax49nYsCpfw4knMzI6s3_KCx0M55RlORonHtJgl90mttVWoblAfIIcjxNgvG9zl_r5O-vFZ73ds0yJ_XeqA34PPXjQbXNJ986sBIAvd5Tu-ZHyECEkw5L-8VyXjn5F0ljxt-rTGa_YA8ADXp-IGOCUkt0h9WBwC_JMfeB8RR405hRrLUFCmTRwue45LSMEWOmeiq-i7SXrbWKB9qBm7Q1UgKR--N95bOOSR8B9M69Bxve_3-Obvmyv6Qbw2lWQcjZ8BjYSPgB8Repe1OxME27iHLTrV2p7m362cHxqxVYB17Wztqi5trWP1PPerMGXT_hNG8e0CN9jE/https%3A%2F%2Fwww.youtube.com%2Fchannel%2FUCu_65HaYgksbF6Q8SQ4oOvA > > > > From: Seymour J Metz <sme...@gmu.edu> > To: IBM-MAIN@LISTSERV.UA.EDU > Date: 17/05/2019 15:18 > Subject: Re: Ancient DASD connectivity > Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> > > > > T A unit attached to a CU; it was the CU that attached directly to the > channel. There is some overloaded nomenclature here; the control function > of an A unit is entirely different from a control unit. > > > -- > Shmuel (Seymour J.) Metz > > https://secure-web.cisco.com/192B_8vChSMEyndnDPZG4RNlm17VN3PY80ixM5PthJQg8MVIiqCvk9ByLRPOEMdWbZdqGwhf4ppFbu3Lu1yy9-DSjADiZM3jzcZ4UZOo_drGdzNjGpAjEJpZ9JLRrGARR_uXICqAlkz1Yov-GLPH8yR57rGEmecK6kz3PmnVnXrn0FuQO0BktLd5oYo0NkdzPMGQ59teedMN8CJ6sG-WVK9CHUcHTGJYS1ZdAHJLA85oxsmKA0m3obsoSufzR1CArcEmQoyq4F3aFPIZa7aC-ukShghPM2JEiKAM8d1iMop2PkRl3lvlhA_d71aBCSPuNh1-ViaUQhBT22zIYIys3lNRGcep-3yXPDvn2z4L58b2Vhtv-5f8hqyWhdIUM6xJ0CdX8qEVYPY-fxg4SGfkS3831zr_4754rutnDDNCVyeM/https%3A%2F%2Furldefense.proofpoint.com%2Fv2%2Furl%3Fu%3Dhttp-3A__mason.gmu.edu_-7Esmetz3%26d%3DDwIFAw%26c%3Djf_iaSHvJObTbx-siA1ZOg%26r%3DBsPGKdq7-Vl8MW2-WOWZjlZ0NwmcFSpQCLphNznBSDQ%26m%3DsbtcjKhJzgcjkqtihVmO6CFwHrRj5q-KUW7yT03NU7Q%26s%3DUjmNKh0zJMgKPveYfD_9y2AfqLn86GvSJJsO6tUpx0Y%26e%3D > > > ________________________________________ > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf > of Alan Altmark <alan_altm...@us.ibm.com> > Sent: Friday, May 17, 2019 10:02 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: Ancient DASD connectivity > > On Thu, 16 May 2019 15:26:45 +0000, Seymour J Metz <sme...@gmu.edu> wrote: > >Well, for some devices the CU and device were in the same box, e.g., > 2501. > > Yes. A-units (Axx models) often include(d) at least one, possibly two or > even four, I/O devices, with B units (Bxx models) providing expansion. > Last CU standing in the A/B world was, I think, the IBM 3590, but it all > went out the window when the 3592s made their debut. > > While it was interesting for IBM to wear it's engineering designs on its > visible sleeve, it was confusing. Model numbers today are more > expressions of marketing than of the underlying technology. > > Fun times. > > Alan Altmark > IBM > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > Unless stated otherwise above: > IBM United Kingdom Limited - Registered in England and Wales with number > 741598. > Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
