Re: jumpering a seagate st15150n (aka rz29b)

From: John Forkosh (john_at_SeeSigForAddress.com)
Date: 11/17/03

  • Next message: John Laird: "Re: jumpering a seagate st15150n (aka rz29b)" 
    Date: Mon, 17 Nov 2003 08:26:48 +0000 (UTC)

    Chris Scheers <chris@applied-synergy.com> wrote:
    : John Forkosh wrote:
    : >
    : > I have a couple of these in a vs4000/90, one as on "online backup"
    : > that I'd rather not spin up until I actually mount it, since they
    : > run kind of hot. I have the seagate docs for the drive, and have
    : > tried jumpering the "delay motor start" and "enable motor start"
    : > jumpers, but the drive always spins up at power on. How can I get
    : > it to stop doing that? Thanks,

    : FWIW:
    :
    : The VS4000/90 does not automatically issue a start command to drives.
    : It WILL issue one if you use the console command SHOW DEVICE. In
    : particular, SHOW CONFIG does not start the drive.
    :
    : If you are using VMS, it does not start the drive until you access it,
    : either with MOUNT or INIT.
    :
    : The correct way to jumper the drive is to disable both "delay" and
    : "start". "delay" starts the drive after some number of seconds times the
    : SCSI ID, so if the drive is jumpered to ID 0, it starts immediately.
    :
    : Good luck!

    Thanks, Chris; ditto Ben and John. You and John Laird seem to have
    differing takes on whether or not VS4000/90 automatically issues
    start command...

    John Laird <nospam@laird-towers.org.uk> wrote:
    : On Sun, 16 Nov 2003 04:31:20 GMT (Ben Myers) wrote:
    : ><<snip>> is it possible the SCSI adapter and
    : >driver software are sending out a motor start command?
    : > <<snip>> Ben Myers
    :
    : You are quite right. SCSI "start" commands are sent when booting,
    : obviously, or if console commands are issued to show the status of all
    : devices. VMS, for one, will issue start commands to the non-system devices
    : early on in the startup phase. It is necessary to set the various jumpers
    : for operating systems that fail to do this.

    What's happening to me is that both drives spin up very "early on in the
    startup phase", like John said, way _before_ I ever get to the console prompt.
    So it's not a question of issuing console commands like sh dev.

    If by "disable both jumpers" you mean I should leave the jumpers open,
    then that's what I'm doing. I did fool around with them a little
    to see what effect it might have, but both drives always spin up "early on"
    regardless of jumpering. I've now removed all jumpers except for scsi id --
    boot drive is jumpered 1 (dka100) and second drive is jumpered 2.
    And, as always, both drives spin up almost immediately.

    By the way, there's also a cd rom on the external chain jumpered/set
    as 5; and the machine is Model VS49K-AB, SN AB23904UM8, in case any
    of that makes any difference. Otherwise, I guess I'll have to live
    with the extra heat (and noise). Thanks, everyone, for all the
    information, 

    -- 
John Forkosh  ( mailto:  j@f.com  where j=john and f=forkosh )
  • Next message: John Laird: "Re: jumpering a seagate st15150n (aka rz29b)"

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