Veritas-bu

[Veritas-bu] Linux media server recommendations

2007-02-08 13:48:10
Subject: [Veritas-bu] Linux media server recommendations
From: Michael.Sponsler at ngc.com (Sponsler, Michael)
Date: Thu, 8 Feb 2007 13:48:10 -0500
I have linux media servers (Suse Enterprise Linux 9) on a SAN, also with a 
Solaris (10) master server.  My setup is Netbackup 6.0 MP2.  I suspect you 
might be running NB 5.X....as I see this entry from Sep 2004 which matches your 
problem:

---------------------------------------------------------------------------------------------------------------------
Mark.Donaldson at cexp.com  Mark.Donaldson at cexp.com
Mon, 20 Sep 2004 11:43:10 -0600

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NB 5.1 Enterprise (SS0) on Linux ES3.0.

When NB is started by the ../bin/goodies/netbackup script, it runs a
make_scsi_dev on boot that creates entries in /dev/st & /dev/sg.  These
/dev/st entries are sym-links back to the /dev/nstXX device names.  tpconfig
is supposed to be built with the /dev/st names.

Trouble is that when NB is (re)started, if the tape drive is assigned by
another media server, then the scan of the tape drives on the Linux media
server returns an I/O error for that assigned drive that the make_scsi_dev
binary interprets as a bad drive & the /dev/st link is not built.  tpconfig
doesn't match & the tape daemons don't start right - not to mention that my
drive count is also wrong.

I can't wait until all drives are idle before I restart my Linux media
servers - has anybody solved this already?
---------------------------------------------------------------------------------------------------------------------

Now, the make_scsi_dev script *only* has to run on linux boxes running a 2.4 
kernel.  I have a 2.6 kernel, and my /dev/nstX are nodes, not symlinks to 
/dev/sg/XXX

Now here is the question, what kernel are you running, and what version of 
Netbackup are you running? 

You could always make the symlinks your self, and remove the make_scsi_dev 
command from your start up scripts.  Which by the way, make_scsi_dev is called 
in S77netbackup

--
Mike Sponsler
Michael.Sponsler at ngc.com


-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu [mailto:veritas-bu-bounces 
at mailman.eng.auburn.edu] On Behalf Of Matthew Johnson
Sent: Thursday, February 08, 2007 11:01 AM
To: Whelan, Patrick; veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Linux media server recommendations

Pat,

I have 4 Linux media servers two san and two regular running SUSE9 with a 
Solaris master. The san media servers seem to be doing fine as for the others 
so so! I have one that crashes every time the make_scsi_dev command runs.

When NB is started by the../bin/goodies/netbackup script, it runs a 
make_scsi_dev on boot that creates entries in /dev/st & /dev/sg.  These /dev/st 
entries are sym-links back to the /dev/nstXX device names. The problem is it 
scans all scsi  devices and if any are busy we get I/O errors, and if the scsi 
device is in any way associated with the kernel ----down goes the system--.  

Also the trouble is that when NB is (re)started, if the tape drive is assigned 
by another media server, then the scan of the tape drives on the Linux media 
server returns an I/O error for that assigned drive that the make_scsi_dev 
binary interprets as a bad drive & the /dev/st link is not built.  tpconfig 
doesn't match & the tape daemons don't start right - not to mention that my 
drive count is also wrong.

This has been a consistent problem that neither IBM nor Veritas can figure out. 
We get the generic response "upgrade to the latest kernel" which is not always 
going to work (Veritas storage foundation) that is another discussion.

I am still working on a solution, I think what I am going to do is create a 
script to remove the /dev/st and /dev/sg devices before Netbackup starts. And 
limit recycling Netbackup on the linux servers to a min.

I know this was long winded and I apologize.

Thanks 

-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu [mailto:veritas-bu-bounces 
at mailman.eng.auburn.edu] On Behalf Of Whelan, Patrick
Sent: Wednesday, February 07, 2007 6:25 AM
To: veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] Linux media server recommendations

Does anyone have any suggestions for Linux media servers?

Regards,

Patrick Whelan
NetBackup Specialist
Architect & Engineering
+44 20 7863 5243

Of all the things I've lost, I miss my mind the most! - Unknown

There are only 10 kinds of people on earth - those who understand binary and 
those who don't.

.... Als sie mich holten,
gab es keinen mehr, der protestieren konnte
-- Martin Niem?ller



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