Re: [Networker] Linux Tape Drive Re-Ordering Issue

Francis Swasey wrote:

Have you tested what happens when a tape drive fails and you have to replace it 
with a new one
(which has a different serial number) doing it that way?

Yes of course, you must made them again. You should know at Networkertape drive configuration is oneshot. When you are configured drivesNetworker will use only own configuration not that what hardware sees.That is why inquire program is used to see hardware device path whichyou tell to Networker which Networker will use and when device path ordevice order changed you must tell again devices to Networker.


Regards, Riku

For those of us that created our jukebox back in the 7.2 (or earlier) days and 
have the jukebox
defined using the rd=<storagenode>:/dev/nstX devices, I strongly urge you to 
consider coercing
udev into picking which /dev/nstX device the drive is based on the serial 
number (then
remembering to update that rule when you replace a drive).

I have set it up as /etc/udev/rules.d/20-local.rules -- which is a copy of the 
50-udev.rules
file with a line added for each tape drive like:

KERNEL=="nst[0-9]*", SUBSYSTEM=="scsi_tape", ENV{ID_SERIAL}=="3500507631203e5d4", 
NAME="nst0",
SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}-nst", SYMLINK+="tape0"

just in front of the

KERNEL=="nst[0-9]*", SUBSYSTEM=="scsi_tape", ENV{ID_SERIAL}=="?*",
SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}-nst"

line.

Why would I do something this convoluted?  Because I don't like the risk of 
having to perform a
25 hour jukebox inventory just because a tape drive failed and suddenly I have 
to re-define the
jukebox because EMC's code messed up and can't figure out what happened to that 
tape drive that
broke and was removed.

Frank

On 11/5/10 8:43 AM, Riku Valli wrote:

Matthew Huff wrote:

I'm not sure you understand persistent binding. With persistent binding, no 
changes
(including SCSI bus resets) will change the names (and therefore the drive 
order).

Yes, tape drives uses serialnumbers for devicenames at RHEL 5 for persistent 
bindings. So them
cannot change.
/dev/tape/by-id/scsi-3500308c09fb49000-nst

When you made jukebox, you should select use persistent names and NMC:s 
graphical gui uses
automatic this by-id name convention or manual with command jbconfig -p, but 
jbconfig is'nt
recommed to use at newer Networker versions.



--
Riku Valli <riku.valli AT uta DOT fi>
System analyst, cell +358 50 3951 162
Computer Centre / Room B4166

University of Tampere, Finland

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