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Re: Re: RE: SHMMAX setting on Sun 4800 box

From: Zhai Jingmin <jmzhai_at_staff.oos.com.cn>
Date: Thu, 26 Jun 2003 17:53:19 -0700
Message-ID: <F001.005BAD3C.20030626173437@fatcity.com>


Thanks all ,this is a great list!

>Richard Ji,艇挫
> Hi how do you know that ISM is used even if multiple shared memory
> segment are used in solaris 8?
>
>
>
>>Matt,
>>
>>Your SGA can still be larger than 4G even if SHMMAX is not larger than
>>4G. When SGA size > SHMMAX, mutilple shared memeory segements will
>>be allocated. There used to be a claim that if you can fit the SGA
>>into a single shared memory segment, ISM will be used. This might
>>be true for older version of Solaris, but I have seen ISM being used
>>even when mutiple shared memory segments are allocated on Solaris 8.
>>
>>Regards,
>>
>>Richard
>>
>>-----Original Message-----
>>Sent: Thursday, June 26, 2003 10:55 AM
>>To: Multiple recipients of list ORACLE-L
>>
>>
>>
>>As long as you're running 64-bit solaris and 64-bit oracle, you can set
>>SHMMAX to be larger than 4G, which will allow your SGA to be larger than
>>4G. Keep an eye on your overall memory pressure, though, to make sure
>>you don't oversubscribe the system. If you're running Solaris 8/9
>>and/or using some sort of direct i/o (raw devices, veritas, etc.) you're
>>good to go at that point. If you're running 7 or 2.6 (can you even run
>>2.6 and 7 on the 4800? I doubt it), you'll want to turn on
>>priority_paging in /etc/system to keep your sga from getting paged out
>>in favor of filesystem buffers.
>>
>>Thanks,
>>Matt
>>
>>--
>>Matthew Zito
>>GridApp Systems
>>Email: [EMAIL PROTECTED]
>>Cell: 646-220-3551
>>Phone: 212-358-8211 x 359
>>http://www.gridapp.com
>>
>>> -----Original Message-----
>>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
>>> Behalf Of Zhai Jingmin
>>> Sent: Thursday, June 26, 2003 5:34 AM
>>> To: Multiple recipients of list ORACLE-L
>>> Subject: SHMMAX setting on Sun 4800 box
>>>
>>>
>>> Hello, List,
>>>
>>> Our Sun Fire 4800 server have 8 CPUs and 16G memory.I set the
>>> SHMMAX kernel parameter to 4294967295 according to
>>> installation guide on metalink.The SHMMAX is "max shared
>>> memory segment size".What's the relationship between SHMMAX
>>> and max size of SGA?Because our oracle's SGA may exceed
>>> 4G,can I set this parameter to 8G,10G?
>>>
>>> Any suggestion is appreciated.
>>>
>>> Thanks,
>>>
>>> Zhai Jingmin
>>> [EMAIL PROTECTED]
>>> 2003-06-26
>>>
>>>
>>>
>>> --
>>> Please see the official ORACLE-L FAQ: http://www.orafaq.net
>>> --
>>> Author: Zhai Jingmin
>>> INET: [EMAIL PROTECTED]
>>>
>>> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
>>> San Diego, California -- Mailing list and web hosting services
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>>
>>--
>>Please see the official ORACLE-L FAQ: http://www.orafaq.net
>>--
>>Author: Matthew Zito
>> INET: [EMAIL PROTECTED]
>>
>>Fat City Network Services -- 858-538-5051 http://www.fatcity.com
>>San Diego, California -- Mailing list and web hosting services
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>>--
>>Please see the official ORACLE-L FAQ: http://www.orafaq.net
>>--
>>Author: Richard Ji
>> INET: [EMAIL PROTECTED]
>>
>>Fat City Network Services -- 858-538-5051 http://www.fatcity.com
>>San Diego, California -- Mailing list and web hosting services
>>---------------------------------------------------------------------
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>>also send the HELP command for other information (like subscribing).
>
>= = = = = = = = = = = = = = = = = = = =
>
>
>        崑
>撰
>
>
>        chao_ping
>[EMAIL PROTECTED]
>          2003-06-27
>
>
>
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.net
>--
>Author: chao_ping
> INET: [EMAIL PROTECTED]
>
>Fat City Network Services -- 858-538-5051 http://www.fatcity.com
>San Diego, California -- Mailing list and web hosting services
>---------------------------------------------------------------------
>To REMOVE yourself from this mailing list, send an E-Mail message
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>
>.

Best regards. Zhai Jingmin
[EMAIL PROTECTED]
2003-06-27

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Zhai Jingmin
  INET: [EMAIL PROTECTED]

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
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Received on Thu Jun 26 2003 - 19:53:19 CDT

Original text of this message

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