Re: LTO performance

Hi Hoa


Below again a posting from a few weeks ago - with the microcode - infos


LTO Microcode - Perf Improvement
From: arhoads <arhoads AT PACBELL DOT NET>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 12 Mar 2001 06:10:46 -0800


I'm posting this to the ADSM-L list so that anyone to whom it applies
can gain the benefit ASAP.  I get it from an IBM internal/Business
Partner mailing and recieved permission to post it here.

Regards,  Steffan

+++++++++++

The latest LTO drive microcode (0CE1) provides a
significant performance improvement for customers doing
certain types of tape operations.  This level of code
dramatically improves the overheads associated with
buffer flush (write 0 filemarks) and end of file (write
2 filemarks, backspace 1 filemark).

TSM does a buffer flush after every transaction.  The
end of file impact would be greatest for customers
writing a series of files to the LTO tape drive.  For
tape applications that intensively use buffer flush or
are writing a series of files we have seen 30% to 50%
elapsed time improvements after installing 0CE1.  0BN1
was the previous LTO drive microcode release.

For 3580, 3581, and 3583 mach types (Customer Setup),
the customer can download 0CE1 from:

     ftp://service.boulder.ibm.com/storage/358x

     Choose 0CE1.fmr

Instructions for verifying the current LTO drive
microcode release and how to install the new release
can be found in the IBM Ultrium Device Drivers
Installation and Users Guide available from:

     ftp://ftp.software.ibm.com/storage/devdrvr/

For 3584s, have the customer request his CE update the
LTO drive microcode.


On Friday 27 April 2001 20:44, you wrote:
> What kind of microcode is that Debbie???
> Hoa.
>
> -----Original Message-----
> From: Weeks, Debbie [mailto:debbie AT ADMIN.USF DOT EDU]
> Sent: Friday, April 27, 2001 12:35 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: LTO performance - Update
>
>
> My CE just finsihed putting the latest microcode on the drives.  You would
> not belive the difference this made!  My databse backup that had been
> taking 4 HOURS completed in 10 MINUTES right after the code was applied.
> Perfomance improvement is an understatement!
>
> I executed the command to write to tape again, and it completed in 8
> seconds, a major improvement.  We also tried writng 16M to tape for a
> comparison, and it completed in 13 seconds, so some of that time must be to
> locate on the tape.
>
> Thank so much for all of your help and suggestions!
-- 
With regards / Mit freundlichen Grüßen
With regards / Mit freundlichen Grüßen

    Leopold Hameder

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