Re: Multiple paths to library changer on 3584 LTO

Hi,

This is a good question. If you look at the IBM Ultrium Users Guide, on the 
page 23, it tells that once you enable the control paths by two drive units, 
and you see in the AIX /dev/smc0 and /dev/smc1. You can enable through the 
Atape device driver, the alternate pathing feature by doing this:
# chdev -l smc0 -aalt_pathing=yes
# chdev -l smc1 -aalt_pathing=yes

I did this in one 3584 but there wasn't this attribute in the pseudo device. 
You can try and then tell me if it worked.

For more information, get the manual here:
ftp://service.boulder.ibm.com/storage/devdrvr/Doc/IBM_ultrium_tape_IUG.pdf

Regards,

Anderson

  ----- Original Message ----- 
  From: Anthonijsz, Marcel M SITI-ITDGE13 
  To: ADSM-L AT VM.MARIST DOT EDU 
  Sent: Friday, August 15, 2003 5:56 AM
  Subject: Multiple paths to library changer on 3584 LTO


  Hi,

  When I issue a "show libr" I can see an autochanger list. Does that mean I 
can configure multiple paths to my library?
  How do I do that? I have enabled an additional control path on my library so 
under AIX I have /dev/smc0 and /dev/smc1.
  I can access both of them, but how do I tell TSM to use both? 
  When I try to define an additional I get this response:

  ANR1723E A path is already defined using TSM01 and LIB_3584_1

  In that case I would not have to bother with control paths anymore... Once an 
IBM CE replaced drive F1R01
  - and we all forgot that the control path was running over F1R01 so the 
library was unavailable at that time....

  === Library LIB_3584_1 (type SCSI):
  ===  reference count = 31, online = 1, borrowed drives = 0, update count = 0
  ===   basicCfgBuilt = 1, libInfoBuild = 1, definingPathToLibrary = 0
  ===   addLibPath = 0, driveListBusy = 0
  ===  libvol_lock_id=0, libvolLock_count=0, SeqnBase=0
  ===  Library is shared.
  ===  library extension at 3A7D5408
  ==>  autochanger list:
  ===    dev=/dev/smc1, busy=0, online=1

  Marcel Anthonijsz
  Central Data Storage Manager (a.k.a. storman)
  Shell Information Technology International B.V.
  PO Box 1027, 2260 BA  Leidschendam, The Netherlands

  Tel: +31-70 303 4984
  Mob: +31-6 24 23 6522
  Email: Marcel.Anthonijsz.at.shell.com