adding multiple tapedrives

[Ceesjan van Hattum]

Hi,
I'm to lazy to change DDS-tapes in the weekend. But for now we have no tape-robot. How many tapeunits i can add on the same scsi-chanin before putting the terminator ?
Is it just 8, like c2t0d0 to c2t7d0 ?

Regards,
Ceesjan

[Vicente Sanchez_3]

Hi Ceesjan,

I depends on the scsi bus.

With SE SCSI the number is 7 ( 0 to 6) devices.

With FW SCSI the number is 15 ( 0 to 6 and 8 to 15) devices.

Regards, Vicente.

[V. Nyga]

Hi Ceesjan,

my (old) 'Installing Peripherals' handbook says:
All devices should have a unique bus address between 0 and 6. The bus address 7 is reserved for the SCSI interface. Do not use it for SCSI devices.

Regards
Volkmar

[John Palmer]

Single ended SCSI allows eight devices but your server uses one (normally .7 which is the highest priority) so you're limited to seven devices(.0 to .6).

FWD and Ultra SCSI, allows sixteen. .8 to .15 and .0 to .7 (in priority order lowest to highest), the server uses .7 again so you can have 15 devices.

Regards,
John

[Leif Halvarsson_2]

Hi

Also check the switch on the tape drive. If is is a narrow SE unit there is only possible to select 0-7 (dont't use 7).

[Eugeny Brychkov]

Ceesjan, terminators must be connected at the ends of SCSI bus. In most cases controller is one of 'ending' devices and have trmintation sutned on. Termination rule is not dependent on how many and which devices (tapes, disks) do you have. Terminator(s) should be of correct type for the bus (SE, Diff, LVD)
Eugeny

[A. Clay Stephenson]

This sounds like your are running SE-SCSI; if so, be careful not to exceed the maximum bus length of 6m including all internal connections.