RE: Migration to Shark

Thanks Bruce. I believe FDRPAS is going to be used for the migration.

Craig

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@xxxxxxxxxxxx
Behalf Of Bruce Black
Sent: Friday, January 13, 2006 2:54 PM
To: IBM-MAIN@xxxxxxxxxxx
Subject: Re: Migration to Shark

>
>
>We are migrating from Amdahl DASD to a Shark (Model 800). No one here
>has experience with this. A DBA asked the following questions:
>
>What are the performance differences between volumes defined as MOD-3,
>MOD-9,
>MOD-27?
>
>
I presume you are asking this about the Shark. On a gross level, no
difference in performance, the number of cylinders is not relevant to
performance.

there is an issue, of course, if you put a lot more datasets on the
larger disks, if it results in a lot more concurrent I/Os to those
datasets. The Shark will certainly perform much better than the Amdahl,

but putting datasets that used to be on 9 3390-3s to a single -27 and
running all the same applications may result in a bottleneck.

>What are the implications of changing a volume to a PAV volume?
>
>
PAV is designed to address the bottleneck, by allowing multiple
concurrent I/Os to a single volume. As long as the I/Os are all READs,

or are WRITEs to different datasets (different extents on the volume),
they will be allowed to execute concurrently and give you back the
performance that you used to get on multiple smaller disks. PAV is a
very good thing and has very little downside.

>What type datasets/databases, if any, are required to be on their own
>volumes?
>
Anything that is subject to RESERVEs of more that a few moments (such as

JES checkpoint datasets) and some performance sensitive datasets (such
as paging datasets, but PAV improves performance for multiple paging ds
on a single volume).

Now that I have paid my dues by answering your questions, let me put in
a plug for our volume migration software, FDRPAS. FDRPAS can migrate
your volumes non-disruptively, while it is in use. See our web site
below or call and ask for sales.

--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
personal: bblack@xxxxxxxxxxxxxxxxx
sales info: sales@xxxxxxxxxxxxxxxxx
tech support: support@xxxxxxxxxxxxxxxxx
web: www.innovationdp.fdr.com

----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html

----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
.

Relevant Pages

  • Re: Migration to Shark
    ... Having just finished an FDRPAS-based migration from 2105 Shark DASD to a new 2107 DS8100 subsystem, I can attest that it was a relatively painless process. ... reasons we didn't attempt to move COMMON and PLPA page dataset volumes with FDRPAS was the FDRPAS bucket indicating an exposure to system hangs when disabling PAV's on Page DS volumes without a z/OS APAR fix in place. ... The one drawback of FDRPAS that I hope is resolved before our next migration is the current disabling of PAV support during the volume migration. ...
    (bit.listserv.ibm-main)
  • Re: migration prolems from NT 4.0 to W2k
    ... Bruce ... > We had sticked into this trouble for somtimes and the migration job cannot ... > Best Regards ... >> resources in the NT domain ONLY after the communication broke between the ...
    (microsoft.public.windows.server.migration)
  • Re: Super Bowl Mistake?
    ... Bruce and co, and the MIB, then it was the pit lottery- two great ... What's that saying about Jumping the Shark? ... waitin', waitin on a sunny day, gonna chase the clouds away, waitin' ...
    (rec.music.artists.springsteen)
  • RE: Migration to Shark
    ... We are migrating from 9672 with the Amdahl, to z/890 with FICON to the ... FDRPAS to migrate to the Shark. ... I believe FDRPAS is going to be used for the migration. ... For IBM-MAIN subscribe / signoff / archive access instructions, ...
    (bit.listserv.ibm-main)
  • Re: 2105 to 2107 Migration Question
    ... FDRPAS is the tool they brought with them. ... If you did the migration on a "hot" device at a time when its ... workload required PAVs for acceptable performance, ... I did it in prime time and it was a piece of cake, ...
    (bit.listserv.ibm-main)