* Fw: tape implementation question for SLES9 and persistent Binding
@ 2005-10-26 20:10 Stefan Neff
2005-10-27 11:50 ` Hannes Reinecke
0 siblings, 1 reply; 2+ messages in thread
From: Stefan Neff @ 2005-10-26 20:10 UTC (permalink / raw)
To: linux-hotplug
Hi linux-hotplug-devels,
found on several internet web pages your email. I was looking for
implementation help for persistant binding of tape via udev-command under
SLES9 on a IBM pSerie with EMULEX LP10.000
The problem I / we is that we dont't realy understand all the theoretic
explamantion about the udev. All provided examples only talk about printer
and disk - not tape.
With disk and printeres it looks easy ... because for printers in the
"sysfs" is the s/n listed and for disk you can see the ID. With Tapes its
not the case - in the "sysfs" there is no S/N nor the WWNN or WWPN. So you
dont get information for a unique assignment from there.
This is the udevinfo from a front office colleague wich starts with the
device the node belongs to and then walks up the
device chain, to print for every device found, all possibly useful
attributes
in the udev key format.
Only attributes within one device section may be used together in one rule,
to match the device for which the node will be created.
device '/sys/class/IBMtape/IBMtape0' has major:minor 253:0
looking at class device '/sys/class/IBMtape/IBMtape0':
SYSFS{dev}="253:0"
follow the class device's "device"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:02.6
/0000:d8:01.0/host1/1:0:0:0':
BUS="scsi"
ID="1:0:0:0"
SYSFS{detach_state}="0"
SYSFS{device_blocked}="0"
SYSFS{model}="ULT3580-TD2 "
SYSFS{online}="1"
SYSFS{queue_depth}="30"
SYSFS{rev}="59P3"
SYSFS{scsi_level}="4"
SYSFS{timeout}="0"
SYSFS{type}="1"
SYSFS{vendor}="IBM "
looking at the device chain at '/sys/devices/pci0000:00/0000:00:02.6
/0000:d8:01.0/host1':
BUS=""
ID="host1"
SYSFS{detach_state}="0"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:02.6
/0000:d8:01.0':
BUS="pci"
ID="0000:d8:01.0"
SYSFS{class}="0x0c0400"
SYSFS{detach_state}="0"
SYSFS{device}="0xfa00"
SYSFS{devspec}="/pci@800000020000002/pci@2,6/fibre-channel@1"
SYSFS{irq}="137"
SYSFS{subsystem_device}="0xfa00"
SYSFS{subsystem_vendor}="0x10df"
SYSFS{vendor}="0x10df"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:02.6':
BUS="pci"
ID="0000:00:02.6"
SYSFS{class}="0x06040f"
SYSFS{detach_state}="0"
SYSFS{device}="0x0188"
SYSFS{devspec}="/pci@800000020000002/pci@2,6"
SYSFS{irq}="0"
SYSFS{subsystem_device}="0x0000"
SYSFS{subsystem_vendor}="0x0000"
SYSFS{vendor}="0x1014"
looking at the device chain at '/sys/devices/pci0000:00':
BUS=""
ID="pci0000:00"
SYSFS{detach_state}="0"
What I am looking for is a step by step guidline how to set up the
persistent binding for a ibm tape drive ... best with a pratical example.
Maybe something in that linux code is still missing to support IBM tape...
dont know .. I hope you can help us ...
Mit freundlichen Gruessen / Best Regards
Stefan Neff
RMSS Product Field EMEA RMSS PFE Intranet Webpage
Engineer
IBM Deutschland GmbH http://w3.ais.mainz.de.ibm.com/dept/4165pub/home.htm
ESCC Dept. 0A186, mail: stefan.neff@de.ibm.com
Bldg.82 - 9A
Hechtsheimer Str. 2 phone: +49 (0) 6131 84 - 6059
D - 55131 MAINZ fax: +49 (0) 6131 84 - 2719
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Fw: tape implementation question for SLES9 and persistent Binding
2005-10-26 20:10 Fw: tape implementation question for SLES9 and persistent Binding Stefan Neff
@ 2005-10-27 11:50 ` Hannes Reinecke
0 siblings, 0 replies; 2+ messages in thread
From: Hannes Reinecke @ 2005-10-27 11:50 UTC (permalink / raw)
To: linux-hotplug
Stefan Neff wrote:
> Hi linux-hotplug-devels,
>
> found on several internet web pages your email. I was looking for
> implementation help for persistant binding of tape via udev-command under
> SLES9 on a IBM pSerie with EMULEX LP10.000
>
Ah, yes. Up to know we hadn't considered that someone would need
persistent device names for tapes.
> The problem I / we is that we dont't realy understand all the theoretic
> explamantion about the udev. All provided examples only talk about printer
> and disk - not tape.
> With disk and printeres it looks easy ... because for printers in the
> "sysfs" is the s/n listed and for disk you can see the ID. With Tapes its
> not the case - in the "sysfs" there is no S/N nor the WWNN or WWPN. So you
> dont get information for a unique assignment from there.
>
Well, yes. But as (thankfully) most tapes are SCSI tapes anyway (or at
least connected via a SCSI bridge) we can use the SCSI information.
This is not really a problem. The main problem is that each tapes comes
in different flavours. It has two modi (rewind and non-rewind) and
several configurations, four of which are supported by Linux (that's
what the 'a', 'l', or 'm' is about).
To make matters even worse, all configurations (apart from the default
one) have to be configured _explicitely_ otherwise they simply won't work.
So, as to not confuse users even more I've got the following suggestion:
tape/by-path/pci-0000:d8:01.0-scsi-1:0:0:0-st
tape/by-path/pci-0000:d8:01.0-scsi-1:0:0:0-sta
tape/by-path/pci-0000:d8:01.0-scsi-1:0:0:0-stl
tape/by-path/pci-0000:d8:01.0-scsi-1:0:0:0-stm
for the rewinding tapes; for non-rewinding add a 'n' in front of 'stX'.
And if the tape supports SCSI EVPD pages we might even get a 'by-id'
symlink like
tape/by-id/200e09e600002d683-st
...
If the tape doesn't support SCSI EVPD pages 0x80 or 0x83 then we'll have
a hard time distinguishing between two tapes with the same make; hence
the 'by-id' symlink won't be available there.
D'accord?
Cheers,
Hannes
--
Dr. Hannes Reinecke hare@suse.de
SuSE Linux Products GmbH S390 & zSeries
Maxfeldstraße 5 +49 911 74053 688
90409 Nürnberg http://www.suse.de
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2005-10-27 11:50 ` Hannes Reinecke
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