Yes, I have multi pathing enabled. This system origionally had 2 Fc
adapters - one of which will be gone saturday. So, right now it has 3 FC
adapters while I convert.
smc0 Available 04-08-02-PRI IBM 3584 Library Medium Changer (FCP)
(going away saturday)
smc1 Available 04-08-02-ALT IBM 3584 Library Medium Changer (FCP)
smc2 Available 06-08-02-ALT IBM 3584 Library Medium Changer (FCP)
smc3 Available 06-08-02-ALT IBM 3584 Library Medium Changer (FCP)
smc4 Available 08-08-02-ALT IBM 3584 Library Medium Changer (FCP)
(new adapter added to replace 04-08)
smc5 Available 08-08-02-ALT IBM 3584 Library Medium Changer (FCP)
Logical Device................. smc0
Path Enabled................... Yes
Logical Device................. smc1
Path Enabled................... Yes
Logical Device................. smc2
Path Enabled................... Yes
Logical Device................. smc3
Path Enabled................... Yes
Logical Device................. smc4
Path Enabled................... Yes
Logical Device................. smc5
Path Enabled................... Yes
Adapter 04-08 will be removed as part of the hdwr upgrade, so after the
powerup all devices on 04-08 will drop to a DEFINED state. What I wasn't
sure
was whether multipathing will work on a DEFINED device. If it does, then
TSM will talk to the lib on smc0 (in defined status), but atape
will failover the I/O to one of the other paths.
I figured it was best to resolve this before the outage.
What I find strange is that if the path with /dev/smc0 is always in use,
then how can you ever change the path? Even if you shutdown/restart
TSM it will open the lib right away and prevent the path from changing.
It's like I need to take the lib offline, but I don't konw of any way
to do that.
Thanks
Rick
"Strand, Neil B."
<NBStrand AT LMUS DOT LE
GGMASON.COM> To
Sent by: "ADSM: ADSM-L AT VM.MARIST DOT EDU
Dist Stor cc
Manager"
<[email protected] Subject
.EDU> Re: Changing a library dev on lib
path
09/24/2008 03:34
PM
Please respond to
"ADSM: Dist Stor
Manager"
<[email protected]
.EDU>
Richard,
If you have Atape multipathing enabled, you may not have to do
anything.
Check using: lsdev -Cc tape
To enable alternate pathing
(From "IBM TotalStorage and System Storage Tape Device Drivers"
Installation and User's Guide - GC35-0154-17)
command: /usr/lpp/Atape/instAtape -a
This will unconfigure all devices that have alternate pathing set to No,
and will reconfigure all devices, setting alternate pathing to Yes.
To enable or disable the support on a single logical device, use the
smit menu to Change/Show Characteristics of a Tape Drive, then select
Yes or No for Enable Alternate Pathing Support.
The support can also be enabled or disabled using the chdev command, for
example: chdev -l rmt0 -aalt_pathing=yes chdev -l rmt0 -aalt_pathing=no
Cheers,
Neil Strand
Storage Engineer - Legg Mason
Baltimore, MD.
(410) 580-7491
Whatever you can do or believe you can, begin it.
Boldness has genius, power and magic.
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Richard Rhodes
Sent: Wednesday, September 24, 2008 2:58 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Changing a library dev on lib path
Hi Everyone,
I have a 3584 library (connected to AIX) for which I need to change the
device file used in the library path. It currently points to /dev/smc0
and I need to change it to /dev/smc4.
When run the following cmd, I am told that the lib is in use . . .
update path tsmlm2 3584isoc srct=serv destt=library device=/dev/smc4
ANR8450E UPDATE PATH: Library 3584ISOC is currently in use.
I then try to put the path offline . . .this works, but the above
command still reports that the lib is is use.
update path tsmlm2 3584isoc srct=serv destt=library online=no
ANR1722I A path from TSMLM2 to 3584ISOC has been updated.
update path tsmlm2 3584isoc srct=serv destt=library device=/dev/smc4
ANR8450E UPDATE PATH: Library 3584ISOC is currently in use.
There ARE tape mounted in some drives. Do I need to get all the drives
offline and demounted to do this?
What do I need to do to change the device of a library path?
What's happening . . . We are upgrading the AIX server this saturday by
adding 2 additional I/O drawers. These drawers will need a
new/additional RIO cable. The RIO cables needs to use the same slot as
one FC adapter (slot 4 of the processor unit), so the FC adapter in slot
4 will be removed. That FC adapter has one set of lib/drives defined on
it, AND, those are the smc/rmt's used on the PATHs in TSM.
I added another fc adapter to the lpar and moved the drive paths to
these new RMT devices, but I'm having trouble moving the lib device.
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