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  2. MIDRANGE-L
  3. August 2014

Re: Fiber vs SAS LTO Tape Speed

If i'm not mistaken NPIV works only with a switch so you would need:
8/16G FC adapter + NPIV capable switch + FC Tape Library vs SAS adapter +
Tape Library, so yes, it's lot's cheaper to use SAS.

Roberto


On Tue, Aug 19, 2014 at 11:36 AM, <rob@xxxxxxxxx> wrote:

If that's the case, why would anyone ever go SAS?
Is SAS cheaper than fiber? Significantly so?
If you are talking one card to one drive, do you really need the SAN
switch?


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
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http://www.dekko.com





From: DrFranken <midrange@xxxxxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 08/19/2014 10:32 AM
Subject: Re: Fiber vs SAS LTO Tape Speed
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



> <snip> Granted, with
> virtualization there is little need for each lpar to have their own
> physical connection.

Exactly which again plays to Fiber so it can 'see' the drive through
VIOS and NPIV. This works very nicely I might add!

- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 8/19/2014 6:40 AM, rob@xxxxxxxxx wrote:

After seeing the difference in speed of just an LTO4 coming from a Power
6
to a Power 8 I would be really impressed to see if the difference is
noticable between fiber and SAS, or, could it be attributable to other
factors like processor, SSD vs HDD, etc.
I would argue that the flexibility of fiber being attachable to a SAN
switch might be a deciding factor in many cases. Granted, with
virtualization there is little need for each lpar to have their own
physical connection.


Rob Berendt

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