My "reverse engineering" revealed that the maxlimum block size is 192kB.
At least in version 6.x.
bash-2.05# strings /usr/sbin/nsrmmd|grep block|grep max
illegal block size (%s KB) for (%s) using maximum supported block size of 192kB
Craig Faller wrote:
Hi guys,
HAs anyone played around with the block sizes Networker uses with SDLT320
tape drives. Does anyone have any tips regarding limitations (maximums,
minimums etc) for SDLT320's ?
We are wanting to increase the block sizing etc to assist in speeding up
thru-put etc, is 256kb the limit, or would 512kb work out ok ?? that is
assuming i am correct that the default is 128kb.
Also would the HBA have limitations we need to consider ??
Also another issue I came across, we the steps that you "used" to be able
to perform to have Networker return the current Block sizing for the
devices/tape drives....
used to be able to stop networker, add the following 2 lines to the startup
NSR_DEV_BLOCK_SIZE_MSG=YES
NSR_DEV_TAPE_FILE_SIZE=YES
then re-label a tape, and it should alert what the blo9ck size etc was
when the previous nsr label was performed....
this didnt return anything....any ideas ??
Rexxy.
p.s. I havent RE-read any of the above, hope it makes sense....hehehe
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