Hi,

not that I have any clue whatsoever but the following info might help:

1- OS, I'm guessing windows or linux
2- Is the OS fully patched?
3- which version of atape/ibmtape are you using?
4- which version of TSM are you using
5- sandiscovery on or off?
6- if on windows, do you have persistent binding enabled?
7- and have you tried using not the most recent driver
8- are your san-switches up to date?

On 4 mrt 2011, at 16:32, Laks, Brian wrote:

> I have 9 LTO-4 drives connected to our TSM server, only 5 of them work at any 
> time after upgrading to a new fiber card.
> 
> We have tried two different fiber cards (qlogic and emulex) and still only 5 
> drives.
> 
> We have Confirmed latest drivers and firmware with IBM support.  The old 2gig 
> fiber card still works with all 9 drives, but is considerably slower than 5 
> drives on an 4g card.
> 
> The new cards are both multi port cards, but only one port is being used.  
> Multipath drivers are not being used.  9 drives are zoned to one port.
> 
> IBM support believes it to be hardware since the old card works, so we 
> purchased a second card of different manufacture.  Now the problem exists on 
> two fiber cards of different manufacture so I'm real reluctant to think its a 
> hardware problem any more.
> 
> Interestingly, the 5 good drives vary.  I can unload the drivers and reload 
> everything and drives that were previously unavailable work while drives that 
> were working are then unavailable.  It seems kind of random.  All the dives 
> show up in the OS, and TSMDLST show them all as well.  I uninstalled old 
> drivers and reinstalled them exactly as per IBM support instructions, and 
> rebuilt the drive and library paths in tsm during each reload as per IBM 
> support guidelines.
> 
> Has anyone seen anything like this?  I'm absolutely baffled.  I'm thinking we 
> are going to have to zone 5 drives to one port and 4 drives to the other, but 
> the SAN admin type is reluctant since all 9 drives work with the original 
> card.  My guess is that somewhere in the drivers its smart enough to know 
> that 9 LTO-4's to a single 4g port is silly in the first place.
> 
> Maybe someone wants 4 LTO-4's so this problem just goes away :)  The 5 drives 
> work with fewer problems and better throughput than the 9 drives on the old 
> card.
> 
> Thanks for reading, Have a great day.
> 
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Met vriendelijke groeten/Kind Regards,

Remco Post
r.post AT plcs DOT nl
+31 6 248 21 622