topic Re: Unlimiting ulimit in Operating System - HP-UX

Unlimiting ulimit

ganzsp — Mon, 10 Mar 2008 04:40:39 GMT

Hai,

I need to set data size and stacksize to be unlimited in ulimit setting. At present it is
# ulimit -a
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 1048576
stack(kbytes) 131072
memory(kbytes) unlimited
coredump(blocks) 4194303
nofiles(descriptors) 1024

through forum i got to know we have to change maxdsize and maxssize and there is 32-bit and 64-bit OS and this is related to kernal parameter.

but i dont get how to check this and command to modify the ulimit. can anyone help me Providing the same.

will # ulimit -d unlimited option will help??!
i don't have any idea as i have no exposure in HP-UX .

Re: Unlimiting ulimit

Dennis Handly — Mon, 10 Mar 2008 04:59:18 GMT

You can't make it "unlimited" unless you are using 64 bit programs.
See the following thread:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1194267

If you don't log out after you change maxdsiz, you'll need to have root do "ulimit -d unlimited". A normal user will have to re-login.

Note: Your maxssiz is fine and you don't want to increase it.

Re: Unlimiting ulimit

Arturo Galbiati — Tue, 11 Mar 2008 09:13:33 GMT

Hi,
why chnage maxdsize and maxssize?
Simply type:
ulimit -s unlimited
ulimit -d unlimited

I sugget you to put both in the default .profile

HTH,
Art

Re: Unlimiting ulimit

Dennis Handly — Tue, 11 Mar 2008 14:11:55 GMT

>Art: why change maxdsiz and maxssiz?

Because these are the kernel limiters.

Re: Unlimiting ulimit

ganzsp — Wed, 12 Mar 2008 02:57:19 GMT

Hai,

#ulimit -d unlimited
User not allowed to change is the error it throws

And the maxssize are required to be modified because it is throwing

ORA-19502: Write error on file: â /FS/../../.._FullExp.dmpâ , balockno 547713(blocksize=4096).

ORA-27072: File I/O error.

HP-UX Error: 27: File too large

when a logical back-up is taken.

but the FS is already in large files option.

Thanks
Ganzsp

Re: Unlimiting ulimit

Venkatesh BL — Wed, 12 Mar 2008 03:22:55 GMT

You can use 'kctune' command to see the kernel settings.

Example:
# kctune |grep max |grep siz
maxdsiz 1073741824 Default Immed
maxdsiz_64bit 4294967296 Default Immed
maxssiz 8388608 Default Immed
maxssiz_64bit 268435456 Default Immed
maxtsiz 100663296 Default Immed
maxtsiz_64bit 1073741824 Default Immed
#

Re: Unlimiting ulimit

ganzsp — Wed, 12 Mar 2008 03:31:59 GMT

Venkatesh,

The Kctune option is not available and i can find the size of maxssize and maxdsize params through sam.

But modifying is were i face the problem.

-Ganzsp

Re: Unlimiting ulimit

Dennis Handly — Wed, 12 Mar 2008 05:28:30 GMT

#ulimit -d unlimited
>User not allowed to change is the error it throws

Are you root when you do this? (At one time there was a bug where "unlimited" couldn't be used.)

>And the maxssiz are required to be modified because it is throwing

Where do you get this connection?

>The kctune option is not available

You need to mention your OS version. If you don't have kctune(1M), then you have 11.11 and need to use kmtune(1M) and reboot your system.

>But modifying is were i face the problem.

sam should have no problems modifying these kernel parms.

Re: Unlimiting ulimit

ganzsp — Wed, 12 Mar 2008 05:34:20 GMT

yes i'm loggin into the server as root.
and os is 11.11 as stated by you.

Re: Unlimiting ulimit

Dennis Handly — Wed, 12 Mar 2008 06:44:10 GMT

I doubt changing maxdsiz and maxssiz will help on this Oracle problem. You need to contact Oracle. You seem to be close to 2 Gb for that blockno * 4 Kb.

Re: Unlimiting ulimit

ganzsp — Thu, 13 Mar 2008 03:54:05 GMT

Hai all,

I have done with this. as the FS is NFS mounted i have juz unmounted and re-exported NFS and then mounted. Now without changing the ulimit the issue is resolved.

Thank you all for your references.

Re: Unlimiting ulimit

ganzsp — Thu, 13 Mar 2008 03:59:59 GMT

Hai based on discussion it is Done.