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Re: [Networker] The volid on tape and the one in media base is not the same!
2008-05-27 12:39:28
Francis Swasey wrote:
Fazil,
If you are recommending that I use persistent binding, then I will have
to tell you that it is useless for me to do that because I have each
tape directly connected to a port on an HBA. Since persistent binding
has to do with multiple devices attached to a single port on an HBA it
doesn't help me. What I need is persistent binding at the OS level,
which is provided by the newer udev drivers for Linux by basing devices
on the WWNN of the tape drive (at least until I have to replace a faulty
drive).
Frank
What you are saying is not strictly true. Persistent binding is still a
valid concept when connected to a single HBA port.
However, the requirements for persistent binding vary between operating
systems.
For AIX, persistent binding is unnecessary as the OS already does a full
mapping from WWNN to device name.
Linux also offers something similar when using udev if you use the long
device names in the /dev/tape/by-id directory.
Windows with the IBM LTO drivers can do the same if you set it up correctly.
Solaris needs persistent binding from the WWNN to the SCSI address, so
this depends on the HBA used.
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