I have a request for a linux server that will be hosting an oracle data base.
The requestor has requested 8G of main memory and 8G of swap (Our normal server
usually has 1.5G of swap - .5 on dasd and 1G on vdisk).
Does anyone have any thoughts about giving this person 8G of swap ?
I've been
Hello colleagues,
It is with some sadness and some anticipation that I will be leaving IBM
and joining Innovation Data Processing this week. Working in a small
company will probably be a better fit. As well as my 27 years, this will
end nearly 55 consecutive, overlapping years of service to IBM
Hi Mike.
Sounds like you're starting 2014 with a bang.best of luck with the new
position! Drop the list a note when you get settled in with your new contact
info.
See you at the VM workshop.
Have a good one, too.
DJ
Sent from my Verizon Wireless 4G LTE Smartphone
Original
I would stick with the smaller swap ... as you say, if the server is
swapping a lot, it's better to give it more main memory and let z/VM manage
memory paging then let Linux continue swapping.
I always prefer to give less (memory and swap) initially and add more if
actual behavior warrants it.
You are correct. For successful Oracle implementations it is necessary to
estimate the memory requirements, by considering SGA, PGA, number of
dedicated connections, Linux page table requirements, ASM, RAC etc., The
total of swap space and the guest memory relates to how much virtual memory
is
I have a request for a linux server that will be hosting an oracle data base.
The requestor has requested 8G of main memory and 8G of swap (Our
normal server usually has 1.5G of swap - .5 on dasd and 1G on vdisk).
Does anyone have any thoughts about giving this person 8G of swap ?
First
Good luck and that is a big loss to IBM
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Michael
MacIsaac
Sent: Monday, December 30, 2013 7:48 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Bye-bye IBM
Hello colleagues,
It is with some sadness and some
Thanks for all your answers. I guess I'll give him another vdisk of 4G and if
he needs more, I can swapgen another vdisk.
One more question about swap:
Is one 8G swap device better than 4 2G swap devices ? It's a lot easier adding
another swap device than having to increase an existing swap.
In addition to the spot on info already supplied, this Redbook should be
helpful as well: http://www.redbooks.ibm.com/abstracts/sg248104.html?Open
Thanks, Best Regards and Happy Holidays,
Kurt Acker
IBM Smarter Planet, Smarter Data Centers
Virtualization and Enterprise System Management
Thanks for the info. Interesting guide
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Kurt Acker
Sent: Monday, December 30, 2013 9:50 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: oracle question
In addition to the spot on info already supplied,
Thanks for all your answers. I guess I'll give him another vdisk of 4G and if
he
needs more, I can swapgen another vdisk.
Yeah, small incremental increases usually are good thing.
Is one 8G swap device better than 4 2G swap devices ? It's a lot easier adding
another swap device than
thanks for the response
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of David
Boyes
Sent: Monday, December 30, 2013 10:12 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: oracle question
Thanks for all your answers. I guess I'll give him another
One more thing: check to see if your VM LPAR has some XSTOR defined. VM paging
implements a main store- XSTOR- real disk data migration path that helps a
lot with high paging levels and VDISK.
Your VM performance monitor will tell you lots of interesting stuff wrt paging
performance.
Only for z/VM 6.2 and previous..with 6.3, XSTOR is no longer
recommended, and in fact will be the last release to support it.
Scott Rohling
On Mon, Dec 30, 2013 at 7:38 AM, David Boyes dbo...@sinenomine.net wrote:
One more thing: check to see if your VM LPAR has some XSTOR defined. VM
Regarding XSTOR and VM 6.3. Is it true XSTOR will be going away in VM 6.3
and/or after 6.3?
Steve
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of David
Boyes
Sent: Monday, December 30, 2013 10:39 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re:
This link offers the most official response with some reasoning to the
XSTOR question that I have read/been informed of to date:
http://www.vm.ibm.com/perf/reports/zvm/html/630con.html
Hopefully that info is helpful,
Kurt Acker
IBM Smarter Planet, Smarter Data Centers
Virtualization and
One last question on swap. If I have to set up a 4G swap space, how do I do it ?
I tried using swapgen to define a 2G (4194304 blks) space and it says vdisk
space not available
I looked online and found someone saying that the maximum on a single swap is
4194296.
-Original Message-
Q VDISK USERLIM .. and Q VDISK SYSLIM to see any system maximums set
(sounds like one or both are).Use CP SET VDISK USERLIM INFINITE if you
don't want maximums set .. (or use a value you are comfortable with).
Same with SYSLIM...
Do a HELP CPSET VDISK to read up on the values, etc...
My suggestion would be if you are considering 4 GB of swap space, follow a
layered approach. Define two virtual disks, one for 256 MB and the next one
to be for 512 MB and a third lower priority swap disk (physical disk) for
the remaining required size. 4GB of swap as virtual disk alone is
Thanks - I ended up having 4 swap disks (1 500M dasd, one 1G vdisk and 2 2G
vdisks - total of 5.5G). I just hope that it's enough. Time will tell.
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Sam
Amsavelu
Sent: Monday, December 30, 2013 12:01
Only for z/VM 6.2 and previous..with 6.3, XSTOR is no longer
recommended, and in fact will be the last release to support it.
Good point.
--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to
See the help file for v1310 of SWAPGEN... 8-)
If you haven't already done so, make sure the VDISK system and per-user limits
are set to Infinite in SYSTEM CONFIG and that you have enough VM page space to
back the demand.
I tried using swapgen to define a 2G (4194304 blks) space and it says
Thanks - I ended up having 4 swap disks (1 500M dasd, one 1G vdisk and 2 2G
vdisks - total of 5.5G). I just hope that it's enough. Time will tell.
Just make sure that the real DASD one is used last by making sure the VDISK
ones are prioritied.
Best of luck and congratulations Mike!
David Kreuter
Original message
From: Dave Jones d...@vsoft-software.com
Date:12/30/2013 09:02 (GMT-05:00)
To: LINUX-390@VM.MARIST.EDU
Subject: Re: Bye-bye IBM
Hi Mike.
Sounds like you're starting 2014 with a bang.best of luck
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