Re: Re-Assign 3580's under 280D-001

[DrFranken <midrange@xxxxxxxxxxxx>]

David,

	Thinking about this for a bit. So the issue is that once the switch was 
inserted between your tape drives and your server now you have created a 
network that creates multiple paths between the drives and the server.

	So what you see where all the drives appear beneath each card is 
expected. Thing is that you should be able to vary them on and off as 
needed BUT only be able to have any one drive varied ON by a single 
partition at any one time.

	In your situation I would NOT think you'd want to do anything but a 
single zone with everything in it.

	As to the performance there should be effectively *ZERO difference in 
performance with the switch in there UNLESS the switch is an old 2G 
switch. (The 280D card is a 4G dude and your TS3x00s almost certainly 
are 4G as well.) With performance getting progressively worse that just 
tells me there is something wrong in for sure. My radar tells me it's 
not in the i and it's not LIKELY in the TS3100 so what does that leave?? 
Hmmmmmmmm, I smell something amuck in that FC Switch.
	
        - Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 2/20/2013 9:23 PM, David Charmatz wrote:

> We have 3 280D-001 fiber IOA’s in our system connected to a
> TS3200 w/ 2 drives and a TS3100 w/ 1 drive.  Recently I attempted to place a fiber switch
> between the system and the tape drives so that I could use the tapes drives on
> other systems as well.   To do so, and
> after reading several online posts, I simply inserted the fiber switch between
> the connections (3 Fiber connections to switch & 1 fiber connection to each
> tape drive – 1 fiber zone containing all devices).   After doing so I successfully varied on each
> tape device (we are using the libraries as devices) and let are backups execute
> as normal (CL SAVLIB scripts).  The first
> night the backups for each drive lasts 30 minutes longer than without the fiber
> switch… followed by increasing times each subsequent night which is now up to
> an 1 hour longer per drive.  After doing
> some investigation on the fiber switch, I realized that all throughput to the
> iSeries was going across a single fiber IOA (the first one I attached to the
> switch).  So I set off and created a
> fiber zone for each fiber IOA & Tape drive… but after doing so only the
> tape drive which was connected to the fiber IOA I first plugged in would vary
> on.  I dug into the iSeries side and soon
> realized that the fiber IOA is now the ‘owner’  of each of our Tape drives:
> Resource        Type-model  Status                Text
> DC14             280D-001   Operational           Tape Controller
>    TAP02          3580-004   Operational           Tape Unit
>    TAP01          3580-004   Operational           Tape Unit
>    TAP03          3580-004   Operational           Tape Unit
> So now I’m completely stuck… Is there a way to reassign these
> TAP0* resources under DC14 to another 280D-001 resource?
> If not, I’m thinking I need to delete each device
> description, reconnection each tape drive directly to the iSeries, and power
> cycle each IOA.  After that, I believe I will
> need to reconnect each device to the fiber switch and configure them to
> specific zones as I am attaching them.  Thoughts?
>
>
> Also, Is it safe to power cycle an IOA during online hours or should this be done offline?
>
>
>
> Thanks in advance!!
>
> David