[SunHELP] Solaris 2.6 Memory Limitation

[Mohammed, Ahsan]

Thank you all of you.
I got it now.

Ahsan Mohammed
Database Administrator
(214) 209 2574
Pager: 877 677 5480


	-----Original Message-----
	From:	Josh McCormick [SMTP:josh.mccormick at wcom.com]
	Sent:	Wednesday, February 28, 2001 1:34 PM
	To:	sunhelp at sunhelp.org
	Subject:	Re: [SunHELP] Solaris 2.6 Memory Limitation

	I've got a number of E10k domains running 2.5.1 and 2.6. One in
	particular I'm looking at has 10gb of RAM. Yes, you can have greater
	than 4gb of memory and be able to access it.

	I think the catch, or the distinction here, is that a process, for
	example, Sybase or Oracle, cannot grab a block bigger than 4gb by
	itself. However, the combination of all the processes running on
your
	system can go well beyond 4gb.

	Actually, I've run into this, in that we wanted to increase the
shared
	memory pool that Sybase uses for caching. But the operating system
	limits the amount that an instance of Sybase can grab to 4gb.
However,
	there are a number of other things that run on that system in
addition
	to sybase, and it consumes around 11gb of memory (with swap devices
	holding the excess 1gb).

	Hope this explains things.


	"Fletcher, Joe" wrote:
	> 
	> In something like an E10K you can split the >4Gb into domains and
allocate a
	> chunk for each domain.
	> 
	> -----Original Message-----
	> From: Mohammed, Ahsan [mailto:ahsan.mohammed at bankofamerica.com]
	> Sent: 28 February 2001 17:16
	> To: sunhelp at sunhelp.org
	> Subject: RE: [SunHELP] Solaris 2.6 Memory Limitation
	> 
	> If it can address only 4GB what is the purpose of having more than
4GB?
	> I mean how can the remaining be put into use?
	> Thanks in Advance.
	> Ahsan
	> 
	> Ahsan Mohammed
	> Database Administrator
	> (214) 209 2574
	> Pager: 877 677 5480
	> 
	>         -----Original Message-----
	>         From:   Fletcher, Joe [SMTP:joe.fletcher at metapack.com]
	>         Sent:   Wednesday, February 28, 2001 10:36 AM
	>         To:     'sunhelp at sunhelp.org'
	>         Subject:        RE: [SunHELP] Solaris 2.6 Memory
Limitation
	> 
	>         It's true that 32bit systems can only address a maximum of
4GB of
	> memory. That's not to say that a system running a 32bit o/s
	>         can physically contain only 4GB RAM. Solaris 2.6 is 32bit
therefore
	> it can only address up to 4GB.
	> 
	>                 -----Original Message-----
	>                 From: Naser Ali [mailto:Ali.Naser at irs.gov]
	>                 Sent: 28 February 2001 15:23
	>                 To: sunhelp at sunhelp.org
	>                 Subject: [SunHELP] Solaris 2.6 Memory Limitation
	> 
	> 
	> 
	>                 Hello Every one,
	>                 Just recently some one on our project mentioned
that the
	> E10K  we have which has 16Gig of memory running Solaris 2.6, has
the
	> limitation of only 4 gig on the memory. Is that true with Solaris
2.6...?
	> 
	>                 TIA
	> 
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