Re: [Networker] maximum speed to tape using bigasm and /dev/zero
2006-04-27 07:49:49
Jespers, Bart wrote:
if we use Bigasm to test the speed of the link and devices, does this generate
random data (non-compressable) or data which still can be compressed?
if we use (without networker) the unix "dd" command to send data from /dev/zero
to tape, this data should be highly compressable?
however using both described methods above, I do not succeed in writing more
that 55-65MB/s to a IBM LTO2 taped drive comming from a solaris 9 (4CPU, 8GB
ram) host. the SAN is fully 2 Gbs.
I measured this using the nsrio utility (written by D Stes) which I found on
the web.
I thought that the max speed of a LT02 was at least 70MB/s and even maybe up to
140MB/s?
what kind of max speeds have you attained with LT0 1, 2 or 3?
LTO-2 native write speed is 35 MB/s. If you are seeing 55-65 MB/s you're
doing fairly well. I have only rarely seen better than that.
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