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As the LTO2 cartridges differ from LTO1, their speeds also differ. However 
according to IBM's specs (I have not looked this info for HP or Seagate) - 
an LTO2 drive can read/write LTO1 cartridge at 20 MB/s native. This is to 
be considered 33% improvement and your 26 MB/s may simply mean you are 
getting 1,3:1 compression ratio. With same compression LTO1 drive ought to 
give you 1,3 x 15 MB ~= 19,5 MB/s. If you use LTO2 cartridges, you may get 
1,3 x 35 (or 30 for HP/Seagate) ~= 45 MB/s.

Zlatko Krastev
IT Consultant






Markus Veit <markus.veit AT SCALEON DOT DE>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
24.10.2003 14:42
Please respond to "ADSM: Dist Stor Manager"

 
        To:     ADSM-L AT VM.MARIST DOT EDU
        cc: 
        Subject:        write speed for LTO2 drive using LTO1 tape


Hi,
has anyone tried backing up an image to a LTO2 drive using LTO1 tapes, if 
yes
what throughput did you get?

we tried LAN free backups using an EMC Clariion CX400 and pathlight SAN 
gateway
with 1 G switches,
the max throughput was only 26 MB/sec suggesting that LTO2 drives can only 
write
at LTO1 drive max write speed. (specs 30MB/s compressed)

Any confirmation of this would be appreciated.

TSM Server 5.2.1.1,  STA 5.2.1.1, TSM client 5.2.0.3
W2k environment

Mit freundlichen Grüßen / Best Regards

Markus Veit