Hi Joel
I'm not directly answering your question, but why not change the default
block size of your Windows 2000 FC HBA devices? Is 64K a good default for
your whole environment (disk and tape access)?
Thanks
tl
-----Original Message-----
From: Joel Fisher [mailto:jfisher AT WFUBMC DOT EDU]
Sent: Tuesday, April 08, 2003 4:07 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Effect of changing block size
Hey Guys,
E450/Solaris 2.6/Solstice Backup 6.1.2
STK9310/9940B drives
I was wondering if anyone would know what the effect of lowering the
block size for a device would be.
My 9940B drives currently use the default 256k block size. I would like
to lower them to 64k so I'm compatible with a W2K SAN storage node I
have coming online in the future. Problem is that I have several(~300)
volumes with data on them and 1000 labeled with the 256k block size. I
don't foresee a problem with relabeling the ones without data, but I was
unsure of what might happen to the ones with data. I'm afraid I might
get the "read 256000 bytes, expected 64000, check system device
configuration, disabling forward space record" error. This obviously
would cause recoveries to be incredible slow. I would think that since
the tape was labeled at 256k that it wouldn't have a problem
reading(i.e. the NSR_DEV_BLOCK_SIZE_DEVICE_NAME setting only effecting
new labels and tapes).
Any clarification on this would be great. I don't think it should be a
problem, but then again I'm not quit sure.
Thanks,
Joel
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