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Re: [Veritas-bu] Large Full schedule, DSSU and Shoe Shinning
2010-06-09 12:08:47
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."
The details vary by drive vendor.
On Thu, Jun 10, 2010 at 12:38 AM, Nate Sanders <sandersn AT dmotorworks DOT com> wrote:
Our production Oracle jobs are set to use two 700GB dssu shares in a
Storage Unit. We have our Full schedule set to bypass this and go
straight to tape due to the job being larger than Disk Staging can
handle for Oracle. Is there a fear of shoe shinning here since our
recent migration to LTO4? DSSU sits on some 700GB SATAs in a netapp and
I want to make sure this is acceptable, or find a better way to handle this.
--
Nate Sanders Digital Motorworks
System Administrator (512) 692 - 1038
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