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- Re: creating page and swap files
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05-03-2006 07:18 AM
05-03-2006 07:18 AM
Solved! Go to Solution.
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05-03-2006 07:31 AM
05-03-2006 07:31 AM
Solution$ MCR SYSGEN CREATE dev:[dir]PAGEFILE.SYS/SIZE=100000
to extend the default file
MCR SYSGEN CREATE SYS$SYSTEM:PAGEFILE.SYS/SIZ=100000
install it as a pagefile
$ MCR SYSGEN INSTALL dev:[dir]PAGEFILE.SYS/PAGE
Remember to add the command to mount this device and install the page file into
SYS$MANAGER:SYPAGSWPFILES.COM
Purely Personal Opinion
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05-03-2006 07:58 AM
05-03-2006 07:58 AM
Re: creating page and swap files
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05-03-2006 11:31 AM
05-03-2006 11:31 AM
Re: creating page and swap files
The sysgen will always work.
@sys$update:swapfiles will only expand your primary files.
I did want to point out something to folks
that are rarely able to reboot their systems. They prepare for emergencies
by incresing Pagefile_Count to a larger number than their current number of pagefiles. Thus if they run into a need to add yet another pagefile, they don't need to reboot.
Have fun,
Bob
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05-03-2006 08:18 PM
05-03-2006 08:18 PM
Re: creating page and swap files
Do you mean PAGFILCNT system parameter ?
No harm in setting it bigger than you need.
In recent versions this was obsoleted and the pageswap file vector is set to max size (254 files). Its only one longword per file so does not occupy significant non-paged pool.
Purely Personal Opinion
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05-03-2006 08:33 PM
05-03-2006 08:33 PM
Re: creating page and swap files
So sometime I just check for the biggest free extent and add just this to the current size and so on.
regards Kalle
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05-03-2006 11:10 PM
05-03-2006 11:10 PM
Re: creating page and swap files
the SYSGEN CREATE command has quaifiers to specify that the created file is either to be contiguous (/CONTIGUOUS) or contiguous-best-try (/NOCONTIGUOUS). /NOCONTIGUOUS is the default.
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05-03-2006 11:15 PM
05-03-2006 11:15 PM
Re: creating page and swap files
that is right, but if if you don't have enough contigous space and use best-try, SYSGEN takes the 2 biggest chunks of free space and goes then down the list, even if there a bigger chunks lying around elsewhere on the disk.
regards Kalle
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05-04-2006 02:22 AM
05-04-2006 02:22 AM
Re: creating page and swap files
What I've seen happen too many times is a customer runs autogen, perhaps even as a result of an upgrade. Based on feedback,
the system thinks you need a 500,000 block
pagefile.
The system has an existing 300,000 block pagefile. It tries to create it, but there's not enough reasonably contiguous space, so it creates a 50,000 block page file. Then the system hangs because of it.
Thus, to prevent this from happening, add
Pagefile=0, swapfile=0 in modparams.dat
and taking complete control over their sizing.
One strange thing to me... When you add memory, you generally will need less pagefile useage, but autogen will increase the size of the pagefile.
AGEN$FEEDBACK.DAT will have the peak useage of the pagefile saved, so you can look at that file. It is a simple ascii file.
Thanks for the correction on pagefile count.
I was planning on getting the exact name.
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05-05-2006 09:31 AM
05-05-2006 09:31 AM
Re: creating page and swap files
$ RUN SYS$SYSTEM:SYSGEN
SYSGEN> create disk:[sys0.sysexe]pagefile.sys/size=any_size
Pagefile guidelines:
PAGEFILE sizes are normally sufficient if the combined total size of all pagefiles equals double the amount of total physical memory. In addition, during peak times you should have at least 33% of each pagefile free. Having sufficiently large pagefiles greatly enhances system performance.
Archunan
Archie