We recently added four LTO-3 drives to our tape library, and we still
have two older LTO-1 drives in there, too.
I played around with loading and recovering some data from an older
LTO-1 tape in all of 6 drives. No problems.
One thing I notice is that NetWorker used to report a Volume block size
of 64 KB for this field
(nwadmin->Media->Devices) once an LTO-1 tape was loaded in one of the
LTO-1 drives and
continued to report that as the block size for the given device ever
after. Now, I notice that it reports 128 KB for the new
LTO-3 drives until I load an older LTO-1 tape in which case it changes
to 64 KB, and then after
ejecting the tape, it reports 128 KB again for the device. For the older
LTO-1 drives, it remains at 64 KB.
I've not labeled an LTO-3 tape yet in the new LTO-3 drives, but I
suspect it will report those as 128 KB.
Our SDLT drives always reported 128 KB - both the newer SDLT-600 drives
and the older SDLT-220 drives.
I always thought it was interesting that NetWorker used this higher
block size on the SDLT drives but only
half that on the LTO-1 drives. Now, it appears that the LTO-3s are
getting a better shake? Anybody know the
scoop on this? Will this make reads and writes faster and more
efficient? Is there some reason it was set to
64 KB for LTO-1? Can this be changed or should it be?
I've never mucked around with it but just asking. We've always declared
blocksize=0 in our /etc/stinit.def file for all drive
definitions which I thought was what NetWorker liked and allowed for
variable block size. Hmm ...
George
--
George Sinclair - NOAA/NESDIS/National Oceanographic Data Center
SSMC3 4th Floor Rm 4145 | Voice: (301) 713-3284 x210
1315 East West Highway | Fax: (301) 713-3301
Silver Spring, MD 20910-3282 | Web Site: http://www.nodc.noaa.gov/
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