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тАО01-10-2002 07:10 PM
тАО01-10-2002 07:10 PM
DBA asked to have shmmax as 3.5G
HP docs say: max value for shmmax is 1792M. This limit can be disable by setting the shmmax to 1fffffff and OS imposes its own hard limit for share memory.
I did not use this before, so I would like to know what is this "own hard limit"? Is it 4G or less?
Is OS going to run ok? Is HP supporting that?
Is any impact in performance?
Your opinion will be appreciate.
Thank you.
Solved! Go to Solution.
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тАО01-10-2002 07:20 PM
тАО01-10-2002 07:20 PM
Re: SHMMAX
http://docs.hp.com/hpux/onlinedocs/os/KCparam.ShMmax.html
It shows the max value for HP-UX 11.0 64 bit to be 1 TERABYTE! It also says that the value can not exceed the max. available swap space. Since you've got 4G of swap, the 3.5G shmmax should work fine.
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тАО01-10-2002 07:21 PM
тАО01-10-2002 07:21 PM
Re: SHMMAX
The Max. value of shmmax in 64bit systems is 1 Tbyte !
See this:
http://www.docs.hp.com/cgi-bin/otsearch/getfile?id=/hpux/onlinedocs/os/KCparam.ShMmax.html&searchterms=SHMMAX&queryid=20020110-192344
HTH,
Shiju
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тАО01-10-2002 07:24 PM
тАО01-10-2002 07:24 PM
Re: SHMMAX
The limit is 4TB on a 64 bit OS. Take a look at the thread below,
http://us-support.external.hp.com/cki/bin/doc.pl/sid=b2f5300d13b4d5d909/screen=ckiDisplayDocument?docId=200000047272187
Hope this helps.
Regds
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тАО01-10-2002 07:27 PM
тАО01-10-2002 07:27 PM
SolutionYou may not have performance issues by doing this. Check these links:
http://us-support.external.hp.com/cki/bin/doc.pl/sid=00d21f7b0f8df52c30/screen=ckiDisplayDocument?docId=200000047272187
http://us-support.external.hp.com/cki/bin/doc.pl/sid=00d21f7b0f8df52c30/screen=ckiDisplayDocument?docId=200000032087693
HTH,
Shiju
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тАО01-10-2002 07:53 PM
тАО01-10-2002 07:53 PM
Re: SHMMAX
More than that: I went and changed shmmax to 0xA0000000 ~ 2684354560 (aprox 2.6G) and the DBA said he can allocate to Sybase just 1.6G.
kmtune report shmmax=0xA0000000. ??????
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тАО01-11-2002 01:37 AM
тАО01-11-2002 01:37 AM
Re: SHMMAX
Additional you should increase the swap to minimum 2 times of physical memory.
Ruediger
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тАО01-11-2002 01:42 AM
тАО01-11-2002 01:42 AM
Re: SHMMAX
Regards,
Steve
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тАО01-11-2002 03:15 PM
тАО01-11-2002 03:15 PM
Re: SHMMAX
Sorry for my ignorance. Can anyone tell me how to check if Sybase???s version if is 32 or 64 bits?
Runing a strings command on dataserver and grep for Adaptive
#strings dataserver | grep Adaptive
come back with
???Adaptive Server Enterprise/11.9.2.5/1227/P/SWR 9619 ROLLUP/HP9000-735/HP-UX 10.2/FBO Tue Jun12 08:50:09 2001???
guess HP-UX 10.2 is coming from HP-UX 10.20 that is 32 bits but not sure.
1.Is any other way to check Sybase version?
2.Can you please, re-confirm what is the max share memory that Sybase can use it?
Many thanks,
A.
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тАО01-11-2002 04:26 PM
тАО01-11-2002 04:26 PM
Re: SHMMAX
To verify, you'd have to find the install media. If it doesn't specify that it is 64-bit, then it probably isn't.
A 32-bit application can typically only handle slightly less than 1.75 GB of shared memory.
Good luck.