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тАО12-14-2005 07:12 AM
тАО12-14-2005 07:12 AM
We have just picked up an EVA4000. All is reduntant, there are two disk groups with 14 disk a piece. My question is about the Unix filesystem settings in particular.
nodatainlog Vs datainlog
delaylog Vs log
Also should we bypass the unix buffer cache with "mincache=direct" and "convosync=direct" Does anyone have experience with these various options and could offer advice?
Gerald
Solved! Go to Solution.
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тАО12-14-2005 12:51 PM
тАО12-14-2005 12:51 PM
Re: EVA and Oracle
Are you going to use Oracle 10g?
Why not using ASM?
ASM seems to be very good with EVA, also, ASM has some issues, like redundancy groups, load balancing, etc.
Try this.
Regards,
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тАО12-14-2005 08:14 PM
тАО12-14-2005 08:14 PM
Re: EVA and Oracle
I think you should use delaylog,nodatainlog,mincache=direct,convosync=direct for database files volume and delaylog,datainlog for apps files volume. Pay also attention to the max_dbc_pct and min_dbc_pct values...
Best Regards,
Eric Antunes
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тАО12-14-2005 08:45 PM
тАО12-14-2005 08:45 PM
Re: EVA and Oracle
This is additional $$ product.
Now if you look at man page of vxfs_mount, it says that datainlog and nodatainlog apply to synchrous writes. nodatainlog requires OnlineJFS.
Check following thread and my response in that. It has great document that talks about it in depth.
There is not much of performance improvement with nodatainlog.
Also nodatainlog means samll writes(less than 8kb) are not logged immediatley, but little later. So, there is a element of data intrgrety involved. I always choose datainlog.
About, mincache and convosync, in case of oracle you can do that. It makes sense to avoid double caching-at oracle level and fs level. But studies have shown that it does do great improvement to performance. But still ok to do that to get that very little performance improvement.
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тАО12-14-2005 08:56 PM
тАО12-14-2005 08:56 PM
Re: EVA and Oracle
nodatainlog does not require OnlineJFS. Just mincache and convosync...
What is the data integrity risk for nodatainlog?
Best Regards,
Eric Antunes
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тАО12-14-2005 09:06 PM
тАО12-14-2005 09:06 PM
Re: EVA and Oracle
Read the last paragraph at page 6 of the attached document about nodatainlog option or search for nodatainlog to read all about this mount option.
Best Regards,
Eric Antunes
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тАО12-14-2005 10:39 PM
тАО12-14-2005 10:39 PM
Re: EVA and Oracle
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тАО12-15-2005 01:08 AM
тАО12-15-2005 01:08 AM
Solutionyou should read this previous thread regarding performance
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=960829
and my own thread (back in 2003 !)
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=193104
Regards
Jean-Luc
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тАО12-15-2005 01:33 AM
тАО12-15-2005 01:33 AM
Re: EVA and Oracle
Thanks.
Gerald
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тАО12-15-2005 01:34 AM
тАО12-15-2005 01:34 AM