Fibre Channel (SAN)

Reply
Occasional Contributor
Posts: 13
Registered: ‎07-10-2007

Tape fabric zoning question

Hello,

I have this question. In our tape fabric envrionment, where inherently the infrastructure is 1 initiator to multiple targets, and in this kind of environment is there still a need to have "one initiator to one target" practiced?

How are you guys dealing with this, how do you zone your master server to tape devices?

Thanks!

External Moderator
Posts: 4,811
Registered: ‎02-23-2004

Re: Tape fabric zoning question

I note you have post a similary question here in the past.

http://community.brocade.com/home/thread/2770

is this the same issue ?

what kind of things do you intend to realize ?

TechHelp24
Occasional Contributor
Posts: 13
Registered: ‎07-10-2007

Re: Tape fabric zoning question

Is my thinking correct on the linked post?

This question is concerning the same environment, but not the same question. My current question concerns more with zoning best practice, specifically how many initiators, targets should exist in a zone? 1:1, 1:n, n:n?

If we want to proceed with a one initiator to multiple targest zoning, ie. 1:n, how should we name our zones? For example, if one netbackup master server connects to a tape silo with multiple panels and each panel has multiple tape drives, how should this be represented in the zone name? or it shouldn't be?

Contributor
Posts: 53
Registered: ‎06-24-2009

Re: Tape fabric zoning question

Hi,

In your original (linked) post, your question seems to be "does FSPF work?". The answer is yes!

For the current post, I would say use 1:n zoning with a limit of 4 or 5 targets per zone to contain RSCN propagation. The zone name would indicate the initiator. If the NBU master needs access to more than 5 target drives, then split them up into several zones (by panel, e.g.).

On the other hand, there is nothing stopping you from using 1:1 zoning if you're really paranoid.

Just my opinion,

Alastair

Occasional Contributor
Posts: 13
Registered: ‎07-10-2007

Re: Tape fabric zoning question

Alastir,

Thanks for the reply. I have all the intention to go with 1:n model considering our fabric inherent properties.

However, Alastir, I still think you are too restrictive on your 1:4-5 consideration. Are there any specific concerns for RSCN "broadcast" you are worried about?

thanks,

CadBro

Contributor
Posts: 53
Registered: ‎06-24-2009

Re: Tape fabric zoning question

If a drive goes down for whatever reason, every other drive in the zone will have to PLOGI and the more entries in the zone, the more activity on the SAN and the longer it will take to quiet down again. Are you convinced your drives will support gracefully this disturbance when in full backup?

I would minimise the risk and think 4 or 5 targets is sufficient. Of course, if I had a robot with 12 drives (6 on each fabric) I would extend that limit to 6. It's a question of being reasonable.

Join the Community

Get quick and easy access to valuable resource designed to help you manage your Brocade Network.