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Re: [Veritas-bu] Large Full schedule, DSSU and Shoe Shinning
2010-06-09 12:17:40
On Wed, Jun 9, 2010 at 11:08 AM, Dean <dean.deano AT gmail DOT com> wrote:
Shoe shining is less of a problem with modern tape drives, as they have this "speed matching" which will slow the tape drive's throughput down to match, as closely as possibe, the speed that data is coming in from the host...
"The IBM LTO-4 drive has the new technology that matches dynamic speed at
any of the 6 speeds of 30MB/sec, 48MB/sec, 66MB/sec, 84MB/sec,
103MB/sec, or 120MB/sec. This speed matching is done for the adjustment
of native data speed of the tape drive as close as possible with the net
data rate of the host. The host's net data speed is that which is
achieved after the factoring out of data compressibility."
In other words, you should be seeing about 60MB/sec from NetBackup (assuming 2:1 compression) to meet the minimum LTO-4 drive speed of 30MB/sec.
.../Ed _______________________________________________
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