Date: Tue, 18 Jul 2000 10:46:59 -0400 (EDT) From: Mikhail Teterin <mi@privatelabs.com> To: scsi@freebsd.org Subject: slow tape behind fast drives on the chain Message-ID: <200007181446.KAA76520@misha.privatelabs.com>
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Hello! For a while we were happy with two external 45Gb drives hanging off of AdvanSys 3550 Ultra SCSI Adapter: da0 at adw0 bus 0 target 2 lun 0 da0: <SEAGATE ST446452W 0001> Fixed Direct Access SCSI-2 device da0: Serial Number LF214132 da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled da0: 44884MB (91923356 512 byte sectors: 255H 63S/T 5721C) da1 at adw0 bus 0 target 3 lun 0 da1: <SEAGATE ST446452W 0001> Fixed Direct Access SCSI-2 device da1: Serial Number LF214978 da1: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled da1: 44884MB (91923356 512 byte sectors: 255H 63S/T 5721C) Yesterday, we added the tape drive: pass2: <ARCHIVE Python 04106-XXX 735B> Removable Seq pass2: Serial Number GS0D9S5 pass2: 3.300MB/s transfers and the drives started to give all sorts of problems. This sounds like a bad cable/terminator, but I wonder if the combination is even suppoused to work -- the tape has the Tectronix connectors on the back, the drives have the 68pin. The short 68pin cables connect one of the drives to the adapter and to the second drive which used to have an active terminator on it's second 68pin jack. Now, there is a 68-50 cable there extending the chain to the tape, which has an active terminator. Would access to the drives be slower because of the tape's mere presense? Will it slow (noticable) when the tape is in use? It everything should work fine (it does not) -- what do I replace first -- the 68-50 cable connecting the tape to the second drive or the active terminator on the tape? Thanks a lot! -mi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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