Email Subscription Notifications Suspended Temporarily
We are in the process of making navigation in the Servers and Operating Systems forums simpler and more direct. While doing this, we have to temporarily suspend email notifications for subscriptions. If you are subscribed to one or more discussion boards or blogs in the community, please check them daily to see new content. Notifications will be turned back on in a few days. We apologize for any inconvenience this may cause. Thanks, Warren_Admin
cancel
Showing results for 
Search instead for 
Did you mean: 

Daizy chain

Suresh Patoria
Super Advisor

Daizy chain

Hi All,

I have 1 DLT 2/20 library and 1 ultrium
I want to do daizy chain.
i want to know daizy chain possible or not for the same
If possible then which cable is required for this.
Both the things are LVDS

whoever answer for this will get the highest points

Thanx in advance
9 REPLIES
Suresh Patoria
Super Advisor

Re: Daizy chain

It is DLT 8000 drive
Kurt Beyers.
Honored Contributor

Re: Daizy chain

You can daisy chain it (but I would recommend a different SCSI controller for the Ultrium drive).

If you only have one controller, use the following chain:

SCSI-Ultrium-DLT8000_drive1-DLT8000_drive2-robot_arm

best regards,
Kurt
Suresh Patoria
Super Advisor

Re: Daizy chain

Tahnx for the fast reply,

but i have one core scsi I/O in DLT

and i have seperate Ultrium so now tell how i should connect that.
what is length of the cable sould supported for daizy chain

Thanx
Angus Crome
Honored Contributor

Re: Daizy chain

I have one device on LVD that is 12 feet from initiator to device. You can probably go a little farther than that, but I wouldn't count on it.

As for Daisy chaining "Just say no". Find a means of getting a second controller. If you have to use it in the D.C. configuration, try very hard to use only one device at a time, and put the LTO first in the chain.

Reasoning;
If you use both simultaneously, it will kill the streaming effect of the technologies. This will 1) Degrade your throughput very significantly, 2) Prematurely wear out the drives and media in them.
There are 10 types of people in the world, those who understand binary and those who don't - Author Unknown
Suresh Patoria
Super Advisor

Re: Daizy chain

Hi,

We have FC card in DLT
it is acting as a bridge

DLT talking over fiber

how i connect Ultrium on DLT

Thanx
Kurt Beyers.
Honored Contributor

Re: Daizy chain

How many SCSSI ports do you have in your fibre switch? Normally you have two SCSI ports, I would do the following:

SCSI_port1-DLT_drive1-DLT_drive2-robot_arm
SCSI_port2_LTO_drive

But again, see that you cannot claim some resources for a dedicated SCSI controller for the Ultrium drive.

Kurt

Suresh Patoria
Super Advisor

Re: Daizy chain

HI,

can i do like this


SCSI_port1-DLT_drive1-robot_arm SCSI_port2_DLT_drive2_LTO_drive

pls tell me which cable i should connect.
what length it is supported

Thanx
Leif Halvarsson_2
Honored Contributor

Re: Daizy chain

Hi,

Cable lenght depends on the type of SCSI interface (SE or LVD).

It makes a big difference if any of your devices is SE (Single Ended). If you are sure that all devices (and the HBA) is LVD the max length is 15 m. If any of the devices or the HBA is SE the max lenght is 3m (internal lenght should be included).

In your case daisy chaining is possible if all devices is LVD.

Note, if all devices is running concurrently you may get performance limitations with the Ultrium drive.
Joshua Scott
Honored Contributor

Re: Daizy chain

Order on the SCSI Bus does not matter whatsoever. make sure, however, the the ultrium drive gets a SCSI ID of 6 (highest priority) and that the 2 DLT Drives get higher than the robot arm. The priority is in this order, from high to low:

7,6,5,4,3,2,1,0,15,14,13,12,11,10,9,8.

The maximum length is 12m or 39ft.

Josh
What are the chances...