[SunHELP] Solaris 2.6 Memory Limitation

[Josh McCormick]

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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