Hi Sean
Here's the workaround to the problem you're seeing with the EDLs: force
use of the SCSI VPD page 0x80, instead of the default page 0x83, by
adding the single line 'options=-p 0x80' to the file
'/etc/scsi_id.config'.
tl
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Sean Smith
Sent: Thursday, March 26, 2009 4:16 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Persistent Binding in Linux
Dean:
The reason why your commands below aren't working properly is
that you're making the same mistake I did. The writers of the udev
supporting utilities (scsi_id, etc.) decided that since their software
would only work against the devices in the /sys directory, that they
would ignore the /sys directory. So, your commands should be:
scsi_id -u -g -s /class/scsi_tape/nst0
Or
scsi_id -u -g -s $(udevinfo -q path -n /dev/nst0)
Try those and see if you get better information.
However, the devices you want to use should be in /dev/tape/by-id/*. In
RHEL 5.1, they don't show up there due to a now patched race condition
within udev. The udev rules were written wrong, too, but at least
they'd pick up the first 10 tape drives on your system.
Like Terry said, in RHEL 5.3 they show up better, but with a caveat:
In some of our older CDLs (we have 2 EDL 4200s with v3.1 and 1 CDL 310
with v2.2 code, I am specifically referring to the latter in this case)
the tape drives' serial numbers come through with the same number, so
our symlinks in /dev/tape/by-id/ get overwritten by the next one down
the chain. So, on this one, I'm working to find some sort of drive
specific information to use in my own custom udev rules. I hope you're
using something more recent.
For more information on writing your own udev rules (and an
understanding of the subsystem in general), I found this document to be
helpful: http://reactivated.net/writing_udev_rules.html
Sean
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Eidler, Dean
Sent: Tuesday, March 24, 2009 10:35 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Persistent Binding in Linux
NW 7.3.4
RH Linux Enterprise 5, v2.6 kernel.
I (a *nix newbie) am trying to setup persistent binding on a Linux host
connecting to EMC Clarion Virtual Tape Library (requested by EMC).
Before I setup the udev rules I need to get the "name" of the tape
devices. I have tried
Scsi_id -u -g -s /sys/class/scsi_tape/nst0 and get nothing back.
I have also tried
Scsi_id -u -g -s /dev/nst0 and get nothing back.
What is the correct device name to use as an argument to scsi_id? Local
networker support has refused to help.
Thanks
Dean.
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