Re: Swap space for 11.31 VM host installs with large amount of ram (684 Views)
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Honored Contributor
George_Dodds
Posts: 991
Registered: ‎10-15-2001
Message 1 of 10 (733 Views)

Swap space for 11.31 vm host installs with large amount of ram.

[ Edited ]

Allo, can anyone point me towards latest offical hp docs with recommended swap size for 11.31 vmhosts?

 

The current install i'm working on is 1x ram

 

Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 131008 0 131008 0% 0 - 1 /dev/vg00/lvol2
reserve - 1740 -1740
memory 124568 75824 48744 61%

 

Version B.04.30.00

 

In the past i've used 2 x ram , which peeps have been saying is outdated for a while now.

 

But I read in another post 

 

"We found it documented and actually it was true that when you are hosting VMs you will need swap space equal to twice the sizes of the VMs you want active simultaneously"

 

 

Just wondering what the official line is these days.

 

Ta

 

George

 

 

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Acclaimed Contributor
Dennis Handly
Posts: 24,759
Registered: ‎03-06-2006
Message 2 of 10 (717 Views)

Re: Swap space for 11.31 VM host installs with large amount of ram

[ Edited ]

>The current install I'm working on is 1x ram

 

This already is way too much for 128 GB.

 

>But I read in another post

 

What is the URL to that post?

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Honored Contributor
George_Dodds
Posts: 991
Registered: ‎10-15-2001
Message 3 of 10 (713 Views)

Re: Swap space for 11.31 vm host installs with large amount of ram.

[ Edited ]

Allo Dennis

 

The link to the thread is - swap space size with big memory

 

Lots of people have a rule of thumb or personal preference on this, but with single blades now having more ram than superdomes i've worked on, i'm wondering what the official line/best practice is now for vmhosts.

 

Thanks in advance.

 

 

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HP Pro
Dave Olker
Posts: 1,416
Registered: ‎10-10-2002
Message 4 of 10 (708 Views)

Re: Swap space for 11.31 vm host installs with large amount of ram.

Current recommendations are in the Integrity VM & vPars v6.2 Admin Guide on page 37:

 

http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c03689515/c03689515.pdf

 

• Disk space for each guest operating system, including swap space
       NOTE: The VSP requires swap space only as recommended by HP-UX 11i v3.
       Otherwise, no swap space is required for Integrity VM.

 

In other words, configure enough swap for the VM Host system itself as you would any other HP-UX server.  You do not need to configure swap space on the VM Host for each VM guest that will run on the host, assuming you're running a recent version of Integrity VM.

 

Dave

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Acclaimed Contributor
Dennis Handly
Posts: 24,759
Registered: ‎03-06-2006
Message 5 of 10 (706 Views)

Re: Swap space for 11.31 VM host installs with large amount of ram

[ Edited ]

>The link to the thread is ...

 

Unfortunately Ken never replied where he saw that documented.  :-(

And now Dave has refuted it.

 

>configure enough swap for the VM Host system itself as you would any other HP-UX server.

 

Where is that "any other" documented?

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HP Pro
Dave Olker
Posts: 1,416
Registered: ‎10-10-2002
Message 6 of 10 (695 Views)

Re: Swap space for 11.31 VM host installs with large amount of ram

It's documented exactly where I just posted - v6.2 Admin Guide (I provided the link) page 37:

"The VSP requires swap space only as recommended by HP-UX 11i v3"

The way I read that statement is that the swap requirements of the VSP are just like any other HP-UX 11i v3 server. We no longer require you to configure extra swap space for VM guests on the VSP. That requirement was removed as of Integrity VM v4.1. Looking at the v4.1 Release Notes:

3.2.8 No Swap Space Required for Guest Allocation
The Integrity VM Version 4.1 VM Host requires swap space only as recommended by HP-UX 11i v3. Otherwise, no swap space is required for Integrity VM V4.1.
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Acclaimed Contributor
Dennis Handly
Posts: 24,759
Registered: ‎03-06-2006
Message 7 of 10 (690 Views)

Re: Swap space for 11.31 VM host installs with large amount of ram

>just like any other HP-UX 11i v3 server.

 

What I was asking where is the "any other" documented/recommended?

I.e. George's next question.  :-)

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Honored Contributor
George_Dodds
Posts: 991
Registered: ‎10-15-2001
Message 8 of 10 (686 Views)

Re: Swap space for 11.31 VM host installs with large amount of ram

>What I was asking where is the "any other" documented/recommended?

I.e. George's next question.  :-)

 

 

Yep that would be it :-)

 

This is not my build, i'll just be the monkey supporting it once it's live, so this is more out of curiosity to see how the recommended settings have changed and a chance to update my docs.

 

Last time I came out of my cave I found out the world wasn't flat! :-)

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HP Pro
Dave Olker
Posts: 1,416
Registered: ‎10-10-2002
Message 9 of 10 (684 Views)

Re: Swap space for 11.31 VM host installs with large amount of ram

http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c03684531/c03684531.pdf

 

HP-UX 11i v3 Installation and Update Guide
HP Integrity Server Blades, HP Integrity Servers, and
HP 9000 Servers

March 2013

 

Page 11 - Disk space requirements for a cold install

Table 3 on page 12 lists minimum disk space recommendations, including swap space

 

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Honored Contributor
George_Dodds
Posts: 991
Registered: ‎10-15-2001
Message 10 of 10 (682 Views)

Re: Swap space for 11.31 VM host installs with large amount of ram

Thanks Dave much appreciated and to Dennis who i'm sure has his batphone alert him of any new posts :-)

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