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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


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