On Tue, 21 Oct 2008 at 12:22pm, Jean-Francois Malouin wrote
Just got a new HP LTO-4 tape drive and I've done some testing
to get a tapetype entry for it and I don't see much of a difference
between the default (32k) and higher values like 512k, 1024k and
2048k (see below). What are your experiences wrt to a specific choice
of a blocksize for such a drive?
I tested an LTO-3 drive using tar back in the day, and the speed increased
from 41MB/s at 32KB blocks to 60MB/s using 2MB blocks.
Also: I have LTO-3 tapes written with a blocksize of 32k:
will I be able to extract data from them using a different blocksize?
From 'man amrestore':
OPTIONS
-b Set the blocksize used to read the tape or holding file. All
holding files must be read with a blocksize of 32 KBytes. Amre-
store should normally be able to determine the blocksize for
tapes on its own and not need this parameter.
--
Joshua Baker-LePain
QB3 Shared Cluster Sysadmin
UCSF
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