RE: tape speeds, TSM and pase

[Chris Bipes <chris.bipes@xxxxxxxxxxxxxxx>]

So your tape speed is less than 100MB per second.  Well I guess that LTO-3
is around 68MB per second uncompressed so you are correct for now.  But
future drives will exceed the 100MB/s data transfer rate.  With 2 to 1
compression at the drive, that would be 136MB/s though.  Correct me if I am
wrong, does not TSM perform compression at the host and passed thru the
network with no compression at the drive?

You can see that 1Gb/s networks will not necessarily be fast enough for the
latest tape speeds.  I know that we peg our 100Mb/s network backing up
servers across the network.

Chris Bipes

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Evan Harris
Sent: Tuesday, March 22, 2005 2:05 PM
To: Midrange Systems Technical Discussion
Subject: RE: tape speeds, TSM and pase


Chris

The servers are on a dedicated 1gb segment of the network. I expect that 
the actual data transfer rates will probably exceed tape write rates and 
this is what we have seen for other systems using the TSM device.

Regards
Evan Harris