Re: Long running backups to a 3590-B11

One issue to be aware of is that if that 3590 is your Alternate IPL device (IPL 
Type
D), then I believe it is required to be on Bus Zero.

    Pete

mcrump@ballfoster.com wrote:

> I'm not sure I can address the change itself.  However, what IOP are you
> interfacing with and what bus is it on?  I'm assuming 6501 and the main bus
> (0?)....
>
> Performance improvements may depend on what processor you have.  There are a
> number of them that can't drive the 3590 as fast as it can go....this may be
> your bottleneck.  Again this doesn't address your decrease but may help when
> trying to get improvements.
>
> I don't have any real world experiences to tell you about a performance jump 
>if
> you go from a 6501 to a 6534.  You should see some.  I have seen improvements
> when moving the tape IOP off of bus 0.  On one system I saw a 30% improvement 
>in
> backup speed by moving the IOP to a another bus.  If you have a bus available
> with a card slot your only cost is the down time.....
>
> Sorry, I can't address your change but I thought I would throw out these
> suggestions.  My personal opinion is that IBM has had a number of issues
> revolving around the the 3590, IOP's, and backups.  Did the group PTF include
> IOP ptf's?
>
> Michael Crump
> Ball-Foster Glass Container Co.
>
> |--------+------------------------->
> |        |          "Bull, Jeff"   |
> |        |          <BullJ1@Midas-K|
> |        |          apiti.com>     |
> |        |                         |
> |        |          04/06/00 04:58 |
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>   |       Subject:     Long running backups to a 3590-B11      |
>   >------------------------------------------------------------|
>
> Has anyone else had a similar problem -
>
> I have a system with 102GB of DASD, running at about 80% used.  It has
> regularly taken between 11 to 13 hours to do a full system backup each
> weekend (SAVSYS + NONSYS + SAVDLO + SAV (ifs)).  All of a sudden, the
> backups started taking 15/16 hours.  I have recently upgraded to v4r3 (from
> v4r1), initiallly the backups jumped to 28 hours!!  IBM recommended we apply
> additional PTFs, a series of group-ptf packages, this cut the 28 to 18 but
> this is still very painful to system availablility, as you can imagine.
>
> I am liaising with IBM and with the CE; I've stopped saving access paths,
> I'm getting staff to delete old/redundant data, what more can I do?  Has
> anyone had similar experiences or have some advice ?
>
> Kind regards,
> Jeff Bull.
> Senior AS/400 Support Consultant (AS/400)
> Midas Kapiti International Ltd
>
> Tel: 44 (0) 175 370 8224
> Fax: 44 (0) 175 357 0233
> Email:    Jeff.Bull@Midas-Kapiti.Com  << == Replies to
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--
Pete Massiello
OS Solutions International
Phone: (203)-744-7854  Ext 11.
http://www.os-solutions.com
mailto:pmassiello@os-solutions.com


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