I've also seen this with LTO5 HH fiber drives with 8k fiber.
On my production LPAR, 18 SSD almost keep up with the fiber drives, they are not constantly writing. Through put is about 1 tb per hour.
On my r&d LPAR, 24 10k spinny, the disks can't feed fast enough, fiber drives constantly waiting on DASD.

Don't forget about the recent PTF that gave 25% performance improvement.


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
Sent: Tuesday, August 19, 2014 2:13 AM
To: Midrange Systems Technical Discussion
Subject: Re: Fiber vs SAS LTO Tape Speed

The interface speed of the drive for both SAS and Fiber is faster than even an LTO6 the drive can write. That said if you're using the older
5901 SAS card that one has some performance limits so even a 4Gb Fiber will likely be faster. The newer SAS Card is much faster.

That said unless you have a lot of disk arms or a fair number of SSDs the tape drive will likely not be the slowest part of the backup for most shops.

- Larry "DrFranken" Bolhuis

On 8/18/2014 11:28 PM, Kirk Goins wrote:

In real world use,
Are the Fiber LTO5 and LTO6 drives faster that the SAS Drives?

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