Re: FC Performance vs SAS

Holger,

Can you check disk latency and disk waits?
You can use PDI or any performance tool.
RPG is really sensitive to latency.


El jue., 6 de dic. de 2018 09:57, Jim Oberholtzer <
midrangel@xxxxxxxxxxxxxxxxx> escribió:

Holger,

Like everyone is pointing out, there are too many variables to diagnose at
this point.

I would start with telling us about the fibre connection to the V5000
Then RAID type on V5000
VIOS? (doubtful at this point but,,,,,)
Work management on P7?

What do the performance files show about line usage on the Fibre
connection?


--
Jim Oberholtzer
Agile Technology Architects

-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Diego
Kesselman
Sent: Thursday, December 06, 2018 9:52 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: Re: FC Performance vs SAS

The point is : when using PCIX 1.5 GB Cache RAID adapter and some special
part numbers you need SSD and 16Gb FC to pair with a V5xxx. Maybe with a
V5030 (64GB Cache)

With RPG it's a matter of latency and you need good SAN communication
(forget about VSCSI) and fast disk subsystems with real compute power or
you'll feel disappointed.




El jue., 6 de dic. de 2018 09:42, Christopher Bipes <
chris.bipes@xxxxxxxxxxxxxxx> escribió:

How did you define the connection to the SAN? Do you have just one or
multiple virtual connections?

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-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Holger
Scherer
Sent: Thursday, December 6, 2018 7:29 AM
To: Midrange-list <midrange-l@xxxxxxxxxxxx>
Subject: FC Performance vs SAS

Hi Friends,
a colleague just called me about an end user having some performance
issues:

- old box: Power6 E4A, 32G RAM, 18 Disks 139GB SAS
- new box: Power7+ E1D, 128G RAM, V5000 with 8GBit FC, 24*300G 15k
Disk

the new box is slower when running some old style RPG reporting
program, there is not that much I/O and V5000 box gets about 1000 I/O

Sek.

If running serial operations (like save into save file) the box can do
14000 I/O
and up to 550MB/Sek.

As we do not have much customers with a small P7 and SAN - does anyone
of you have experience with these types of config?

-h

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