[SunHELP] ISM in E10K

[DAUBIGNE Sebastien - BOR ( <SDaubigne at bordeaux-bersol.sema.slb.com> <SDaubigne at bordeaux-bersol.sema.slb.com>]

There is a third point about ISM : It will make processes share their
virtual to physical address data structures (TLB, ...).
I would also add that ISM is not the only way to lock pages in physical
memory : one can also use the SHM_LOCK flag of shmctl().
---
Sebastien DAUBIGNE
sdaubigne at bordeaux-bersol.sema.slb.com
<mailto:sdaubigne at bordeaux-bersol.sema.slb.com>  - (+33)5.57.26.56.36
SchlumbergerSema - SGS/DWH/Pessac

-----Message d'origine-----
De:	Lumpkin, Buddy [SMTP:Buddy.Lumpkin at nordstrom.com]
Date:	samedi 11 octobre 2003 02:57
@:	The SunHELP List; sunhelp at sunhelp.org
Objet:	RE: [SunHELP] ISM in E10K

Sure, it really has nothing to do with the E10K other than the fact that you
are more likely to do DR on an E10K than on the other mid-range sun servers
that are pre-sunfire (E4500, E5500, E6500).

ISM allows for two things that makes Oracle specifically run much better.

1) Pages are locked, they are contiguous and uneligable to be reclaimed by
the scanner (they can not be evacuated to the swap device).
2) The pages are very large, 4MB in fact ... standard pages are only 8K
prior to Solaris 9.

Because of #1 above, you cannot drain a board that has an ISM segment on it,
which is the first necessary step to removing a board in the E10K.

Solaris 9 provides a new API that allows an application to relocate an ISM
segment (or suspend it, can't remember). Anyway, Oracle 9i added
functionality that uses that API so that DR operations are now supported.

So the answer to your question is, no you cannot do DR with ISM on the E10K
without bringing down Oracle, but with Oracle 9i and Solaris 9 you can.

Regards,

--Buddy

	-----Original Message-----
	From: Pedro RomC!n Vela [mailto:Pedro.Roman at ydilo.com]
	Sent: Fri 10/10/2003 12:42 AM
	To: sunhelp at sunhelp.org
	Cc:
	Subject: [SunHELP] ISM in E10K



	Hi,

	I am about to setup Oracle in a E10K. I remember I read a while ago
there was
	a problem in some versions of Solaris when using ISM and DR. As ISM
is quite
	recommedned for Oracle, I'd like to know if any of you know the
"current"
	status of this issue and if it's safe to enable ISM in the E10K. I'm
using the
	latest Solaris 8 release (plus recommended patches).

	Thanks in advance

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