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Re: [Networker] Block size settings on a Solaris server
2006-12-12 07:11:43
Pierpa wrote:
Hi,
I have now a NW server v7.2.1 in production on a HPUX v11.11 machine.
It uses a IBM3494 library with 3592 drives type. Due to HBA settings, I
suppose, the networker server uses a block size on its tape 256K in size,
while networker has per default a blocksize 384K in size, for the same
3592 model.
The datazone has 20 storage nodes, both HP and Sun, using each its own
blocking factor ( tipically 256K HP, 384K Solaris ).
During one year in production, no problem to backup/restore.
Now I have to migrate the server on a Solaris v9 platform, Networker
v7.2.1.
I've seen that the HBA driver, working with networker , uses a blocksize
384K in size.
I obviously have to use all the tapes I've already used on HPUX, to
recover data from or to append new backup to, and therefore I have
absolutely to be sure that there are no misunderstandings reading tapes
labeled/written on HP from the new Solaris server. My idea is to set
NSR_DEV_BLOCK_SIZE_3592 variable to 256 on the new Solaris server, adding
it to the networker start script.
I think also that this variable's change will affect only the networker
server, and not the storage nodes ( thay'll continue to use their own
blocking factor ).
I'll do the right thing setting up this variable on the solaris server ?
It's the right way to be sure that all the tapes written on the HP
platform will be readable/rewritable on the Solaris one ?? And what about
the storage nodes ???
Thanks a lot for any suggestion
Pierpa
You won't need to do this. If your HBA on the Solaris Server can support
the higher block size it will read the lower block size without any
issues. The only reason you might need to do this is if you think it is
likely that you might need to read the tapes that you wrote on Solaris
on one of your HP storage nodes. If this is the case then you should set
this variable on all your Solaris storage nodes as well as the server.
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