Oracle's recommended Swap Size for Solaris 10 Oracle 11gR2 (11.2.0.2)

I have a solaris server with 16gb of RAM that will subsequently be zoned into three zones to support three separate database instances, one for each zone. Given that physically there is only 16Gb of ram, It is my understanding and experience that I should have 1.5-2 * 4Gb should be at least 6Gb of SWAP per Local Zone.
Please advise. Thanks

yakub21 wrote:
I have a solaris server with 16gb of RAM that will subsequently be zoned into three zones to support three separate database instances, one for each zone. Given that physically there is only 16Gb of ram, It is my understanding and experience that I should have 1.5-2 * 4Gb should be at least 6Gb of SWAP per Local Zone.
Please advise. ThanksI'd look at it like this .....
Your Phyiscal Memory will be used somewhat as follows:-
- Lets say 1GB for the OS ...
- 1.5GB for zfs arc cahce if your useing ZFS.
- The sum of your PGAs and SGA's should fit within the remainder of ram.
- And your may want a little more to be sure and for other things; monitroting software agents, em etc.
In order that you can use more virtual memoy than you have physical memory for your will porably want to add a swap file, and for a 16GB machine this would probably be 4 / 8 or perhaps up to 16GB depending if would will occasionally have higher virutal memory demands or if poeple but big files in /tmp. In general swap -s can be used to monitor a shortage, though it can foolled if zfs_arc_cache is not limited.
The situation for zones not different unless you are using zone.max-swap and the physical capped memory.
If you have zone with a physical capped memory of 5GB, and a zone.max-swap of 8GB with is af the zone has a swapfile of 3GB; and you have to make sure:
- The global zone is able to give that amount of memory to the non-global zone.
- The global zone can provider the zone.max.swap from its virutal memory.
- That the sga+pga and /tmp usage and other will fit in zone.max-swap ... use swap -s in the zone to monitor.

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Dear all
can anyone help me finding out Total Swap size(constant) value in solaris 10
I tried swap -s and used (Used+available as TOTAL swap)
its keep changing, as its is a current swap size at that time.
actually My intention is to used this forumula in the script,as I found that solaris uses memory as physical+SWAP
(Physcial Memory +swap size)
Total physical+Total swap
what is the best way to find out Actual Total Swap size in solaris ??

I tried swap -s and used (Used+available as TOTAL swap)
its keep changing, as its is a current swap size at that time.
That's to be expected. See "How does Solaris Operating System calculate available swap? (Doc ID 1010585.1)"
actually My intention is to used this forumula in the script,as I found that solaris uses memory as physical+SWAP
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If you want to know the size of the swap device, then look at the device(s) being used for swap and check the size of the slice or zvol. That'll tell you the starting value. The available will fluctuate with system usage. See Doc ID 1010585.1
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yakub21 wrote:
I have a solaris server with 16gb of RAM that will subsequently be zoned into three zones to support three separate database instances, one for each zone. Given that physically there is only 16Gb of ram, It is my understanding and experience that I should have 1.5-2 * 4Gb should be at least 6Gb of SWAP per Local Zone.
Please advise. ThanksI'd look at it like this .....
Your Phyiscal Memory will be used somewhat as follows:-
- Lets say 1GB for the OS ...
- 1.5GB for zfs arc cahce if your useing ZFS.
- The sum of your PGAs and SGA's should fit within the remainder of ram.
- And your may want a little more to be sure and for other things; monitroting software agents, em etc.
In order that you can use more virtual memoy than you have physical memory for your will porably want to add a swap file, and for a 16GB machine this would probably be 4 / 8 or perhaps up to 16GB depending if would will occasionally have higher virutal memory demands or if poeple but big files in /tmp. In general swap -s can be used to monitor a shortage, though it can foolled if zfs_arc_cache is not limited.
The situation for zones not different unless you are using zone.max-swap and the physical capped memory.
If you have zone with a physical capped memory of 5GB, and a zone.max-swap of 8GB with is af the zone has a swapfile of 3GB; and you have to make sure:
- The global zone is able to give that amount of memory to the non-global zone.
- The global zone can provider the zone.max.swap from its virutal memory.
- That the sga+pga and /tmp usage and other will fit in zone.max-swap ... use swap -s in the zone to monitor.

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I have my dev server - I leave this on 512MB and that's fine for
most of the stuff I do. We generally up this to a gig on our live
servers (which only run 3-4 small sites), and historically we've not
gone above this on our Shared servers (which host anywhere up to 400
sites) because of the 32-bit limit.
However, now we're running CF9 on 64-bit Server 2008, we've obviously got a lot more RAM available. The obvious choice is to ramp it up high, but I've also been heard that causes issues of its own - the Java GC then has far more work to do when it's called and as the memory fills it's harder to get a contiguous block of RAM, so performance can suffer.
Leave the memory setting at the default value, until testing requires you to do otherwise, or your sites unravel some unforeseen memory demand. It's a risk our SysAdmin colleagues are prepared to take. With the coming of 64-bit, they've been on the alert, and have always cattle-prodded us whenever we've been tempted to push the button to go higher.
Our defaults almost coincide with yours: 512 MB for 32-bit and just over 1GB for 64-bit. So what you yourself have just said is my own basic wisdom on the subject, too: if it aint broke, don't try to fix it.
[postscript: I work full-time at one company, part-time at another. By pure coincidence, both use the same JVM memory settings.]

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I have trouble with the following OUTPUTs:
# prtdiag
System Configuration: Sun Microsystems sun4u Sun Fire V440
System clock frequency: 177 MHZ
Memory size: 8GB
# /usr/sbin/swap -l
swapfile dev swaplo blocks free
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# swap -s
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Filesystem kbytes used avail capacity Mounted on
/dev/vx/dsk/bootdg/rootvol 62516603 34004373 27887064 55% /
/devices 0 0 0 0% /devices
ctfs 0 0 0 0% /system/contract
proc 0 0 0 0% /proc
mnttab 0 0 0 0% /etc/mnttab
swap 6962904 1608 6961296 1% /etc/svc/volatile
objfs 0 0 0 0% /system/object
/platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap1.so.1 62516603 34004373 27887064 55% /platform/sun4u-us3/lib/libc_psr.so.1
/platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1 62516603 34004373 27887064 55% /platform/sun4u-us3/lib/sparcv9/libc_psr.so.1
fd 0 0 0 0% /dev/fd
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swap 6961344 48 6961296 1% /var/run
swap 6961296 0 6961296 0% /dev/vx/dmp
swap 6961296 0 6961296 0% /dev/vx/rdmp
/dev/vx/dsk/bgw1dg/vol01 203768832 129151641 70294743 65% /var/opt/BGw/Server1
/dev/vx/dsk/ora1dg/vol01 10480640 5502642 4666959 55% /var/opt/mediation/ora
/dev/dsk/c1t2d0s2 70589121 219550 69663680 1% /mnt
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1. What is the total SWAP size for the machine?
2. Why is there 4 lines mentionning SWAP on the df OUTPUT?
3. With 8GB of RAM on this machine do I need to increase the SWAP?
4. If yes how to increase the SWAP?
Thanks in advance !

Swap can be a confusing thing. It's an overloaded term that people often use to mean somewhat different things.
1. Determine the swap allocated for the system with swap -l. The number of blocks minus the swaplo value will give you the true count. Blocks are 512 bytes, so do the math to get a GB value.
2. df output reflects file systems that are currently in use. In Solaris 10 there are a few virtual file systems that are backed by swap space itself. You'll notice all these swap fs components have the same size because they use the swap as a common pool.
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http://docs.sun.com/app/docs/doc/817-5093/fsswap-31050?a=view
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- # mkfile 1024m /filesys2/swapfile
- # swap -a /filesys2/swapfile
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O.S. / Hard Drive Size for NIO Server/Client's load testing...

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I am currently load testing a NIO Server/Client's to see what would be the maximum number of connections that could reached, using the following PC: P4, 3GHz, 1GB RAM, Windows XP, SP2, 110 GB Hard Drive.
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Platform Itanium 64 (linux)]
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
BEA JRockit(R) (build R26.4.0-63-63688-1.5.0_06-20060626-2259-linux-ia64, )
mp

How do I found default heap size, stack size for the
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The default heap size and stack size are documented in the javadocs that explain the tools that come with the sun jdk.
and how the above things will vary for each OS and how
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I found in one forum, in linux you can create maximum
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Oracle's recommended Swap Size for Solaris 10 Oracle 11gR2 (11.2.0.2)

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