|
I/O queuing report is part of the PDI reports. It should be near or in the
same place as the report that shows response times.
Given the times you are reporting I'll bet the farm there is little or no
queueing, in fact you most likely have quite some way to go before you see
some. The wait time of 1ms is likely processor/application/memory wait
state causing it. At that level, it's nothing to be concerned with.
--
Jim Oberholtzer
Agile Technology Architects
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Steinmetz,
Paul
Sent: Monday, December 03, 2018 3:41 PM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxx>
Subject: RE: Performance tuning
Jim,
< If there is any hint of I/O queuing,
100% SSD.
If looking at a Disk Response time graph, do you mean any time there is
"disk wait time".
Normally, my disk service time is .2 ms, no wait time, peaking during
nightly BRMS save to 2.5 ms save, no wait time, and weekly cycle billing
process to 4.0 ms with 1 ms wait time.
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim
Oberholtzer
Sent: Monday, December 03, 2018 3:31 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Performance tuning
Paul,
It depends on the I/O pattern of your machine. If there is any hint of I/O
queuing, then yes it will most likely help. If there is no I/O queueing.
there might be an improvement, but it will be more abbreviated than with
heavier I/O.
Either way I doubt the cost of that option is going to be an impediment to
getting it, so I would look into it. You might not need it now, but in some
short time in the future it might pay off nicely.
--
Jim Oberholtzer
Agile Technology Architects
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Steinmetz,
Paul
Sent: Monday, December 03, 2018 1:57 PM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxx>
Subject: RE: Performance tuning
I have 5770SS1 option 42: HA Journal Performance, installed, not using at
this time.
Within the last year, we installed IBM's CDC replication software, required
for one of our applications.
CDC replication uses journaling.
Would I benefit in purchasing the 5770SS1 option 42: HA Journal
Performance, activating the JRNCACHE(*YES)?
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim
Oberholtzer
Sent: Monday, December 03, 2018 11:45 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Performance tuning
5770SS1 option 42: HA Journal Performance.
--
Jim Oberholtzer
Agile Technology Architects
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Steinmetz,
Paul
Sent: Monday, December 03, 2018 10:20 AM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxx>
Subject: RE: Performance tuning
Darren,
< once you purchase the option
Specifically which option.
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Darren Strong
Sent: Monday, December 03, 2018 10:03 AM
To: Midrange Systems Technical Discussion
Subject: Re: Performance tuning
This is also referred to as journal caching, if you're searching for
information on it. Its activated with the JRNCACHE(*YES) function in CHGJRN,
once you purchase the option. In summary, journal data is cached into memory
before writing to disk in larger chunks, rather than making sure its written
at every change. It makes a big difference on journaled file write/update
performance.
From: "Joe Pluta" <joepluta@xxxxxxxxxxxxxxxxx>
To: midrange-l@xxxxxxxxxxxx
Date: 12/02/2018 01:06 PM
Subject: Re: Performance tuning
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>
Yes, we've already gone to SSD, Rob, so that particular ship has already
sailed. :) However, I am unfamiliar with HA Journal Performance. We use
MIMIX; I wonder if this is something I should be looking into.
Heck, for all I know we already have it, but it definitely sounds like
something I should look into.
On 11/30/2018 12:31 PM, Rob Berendt wrote:
Sometimes throwing money at hardware isn't always the answer. Oura
original foray into SSD's was a big disappointment. Much less money
for
much larger return on investment would have been to buy the "HA
Journal Performance" option as part of SS1. I daresay it will be a
rare consultant who can pinpoint WHY you might need that and predict
how much it will help.
Rob Berendt
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