Networker

[Networker] LTO-3 read speed versus LTO-2/LTO-1?

2007-03-19 17:52:45
Subject: [Networker] LTO-3 read speed versus LTO-2/LTO-1?
From: George Sinclair <George.Sinclair AT NOAA DOT GOV>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Mon, 19 Mar 2007 17:44:15 -0400
Hi,

Three questions here about LTO-3 drive speeds.

LTO-3 has a reported write speed of 80MB/s native, LTO-2 40 MB/s and LTO-1 20 MB/s. Obviously, the advertised write speeds for LTO-3 assume you can feed data to the drive buffer fast enough, but:

1. How fast can LTO-3 drives read LTO-3 tapes?

2. Is the read speed increase over LTO-2 drives the same factor as LTO-2 drives were over LTO-1 drives? Just trying to understand if the read speeds have also been doubling with each generation of drive.

3. Since the read speeds of LTO-3 drives are surely faster than with LTO-1 drives, how much higher could multi-plexing be increased versus with LTO-1 drives and still get similar recover times?

Say, you had target sessions set to 4 under LTO-1, and you were seeing decent recover times. Could you expect to see similar recover times using LTO-3 drives and tapes if you had target sessions set to, say, 12, assuming everything else stayed the same as far as the save sets and their sizes.

Thanks.

George

--
George Sinclair - NOAA/NESDIS/National Oceanographic Data Center
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