Re: [Networker] setting block size
2003-08-08 11:40:03
This sounds very much like the trouble I cause myself after
changing the block size via "stinit" on my Linux machine. Shortly
after I did this, I needed to recover a file on a tape that was created
before the block size change. I don't remember the error messages, but
Networker clearly couldn't successfully read through the older tapes.
I was (am) left with a "pre blocksize change" and "post blocksize
change"
world. This is a completely repeatable phenomenon. Now, if I want
to recover a file from before the blocksize change, I have to reboot
the server without running stinit. What waould hapen to a tape that
was created with the old regime but had files added during the new
blocksize
regime, I'm not sure. I'd think that Networker could find an
end-of-tape
marker and start appending. But scanning the tape might then be
problematic.
This last part is just a guess, but it is consistent with what I
experienced.
Is this any help?
Matt Temple
On Friday, Aug 8, 2003, at 10:57 US/Eastern, Teresa Biehler wrote:
So, I set the environment variable on the Solaris server to lower the
block size to 128KB so that Windows and UNIX agree. I added the
following to the top of the networker start up script:
NSR_DEV_BLOCK_SIZE_8MM_AIT_3=128
export NSR_DEV_BLOCK_SIZE_8MM_AIT_3
After making this change, I restarted the server. I states that the
block size for all the AIT-3 devices is 128KB as expected. Then I
labeled a new tape, ran a full back up to it - so far so good. When I
ran scanner on the tape, however, I get this:
scanner -v /dev/rmt/5cbn
scanner: Opened /dev/rmt/5cbn for read
scanner: Rewinding...
scanner: Rewinding done
scanner: Reading the label...
scanner: Reading the label done
scanner: SYSTEM error: Tape label read: Bad file number
scanner: SYSTEM error: Tape label read: Bad file number
scanner: scanning for valid records...
scanner: read: -1 bytes : Not enough space
scanner: Opened /dev/rmt/5cbn for read
scanner: read: -1 bytes : Not enough space
.
.
.
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
scanner: read: 0 bytes
.
.
.
Does anyone have any ideas what is going on?
Thanks.
Teresa
-----Original Message-----
From: Ruzza, Claudio [mailto:claudio.ruzza AT HP DOT COM]
Sent: Friday, August 08, 2003 8:54 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] setting block size
Teresa,
Needless to say, the variable name should be modified according to
your drives technology.
Example: assuming you have SDLT drives, the variable name will become
NSR_DEV_BLOCK_SIZE_SDLT
In windows 2000 you can set this variable doing some easy steps:
Click right on "My computer" and choose Properties
Choose "Advanced"
Click the "Environment variables" button
Click the button "new" in the lower part of "system variables" pane
In "variable name" enter the name you have "build up" once you have
identified your drive's technology
In "variable value" just enter 128
Click OK and that's all.
Please check that after having set the variable at least one media
initialized by those Server/SN has reaaly labeled at 128K. In case it
doesn't, there are some additional steps to do, involving registry
edit. Check listmail archives, there's a wonderful page about that.
In Solaris and any other UNIX flavour the variable must be set as any
other environment variable. I'm not a UNIX expert, so I can't be more
precise.
Hope it helps
Claudio Ruzza
-----Original Message-----
From: Teresa Biehler [mailto:tpbsys AT RIT DOT EDU]
Sent: venerdì 8 agosto 2003 14:05
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: setting block size
I've got a Solaris Networker server and I'm trying to set up a Windows
storage node that will share the same tape library. So, I
want the each
system to be able to read/write tapes written by the other. Based on
running scanner -v on tapes written by both hosts, I've
determined that
I need to set the block size to 128KB. So, how do I do this? In the
admin guide is says to set the environment variable
NSR_DEV_BLOCK_SIZE_DEVICE_NAME. Where/how do I do this (for both
Solaris and Windows)?
Thanks!
Teresa
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========================================================
Matthew Temple Tel: 617/632-2597
Director, Research Computing Fax: 617/632-4012
Dana-Farber Cancer Inst mht AT research.dfci.harvard DOT edu
44 Binney Street, JF 314 http://research.dfci.harvard.edu
Boston, MA 02115 Choice is the Choice!
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