Re: OPS in Sun E10K

Bala
        I don't see any responses. So, please ignore if this is already answered.
        First of all, In Sun, you have to use RAW for an Oracle Parallel Server database. (I am not sure whether you can use Veritas Quick I/O to configure OPS, my guess would be no). Second, if it is a performance critical database with high concurrent activity, even in a non-OPS set up, I would go for RAW or Quick IO.
        There is always the discussion about the raw vs file system, but the administration overhead you will face is negligible compared to the performance boost you can achieve. I agree that you need to preconfigure the volumes and plan the size etc.., but in a production database that needs to be done anyway. Most of the backup software don't care whether it is a file system or raw either.  On the other hand you avoid double copying, double buffering, vnode lock etc. Specifically, if you use multiple DBWRs also to simulate async IO, vnode lock will serialize your writes degrading the scalability. You can also achieve true asynchronous IO also if you raw disk based database.
        Couple of years ago, at my previous employer, we converted few databases to raw and our performance was much better. Particularly, considering that we had I/O intensive OLTP application, we were able to scale beyond the requirements easily.

Thanks
Riyaj "Re-yas" Shamsudeen
Certified Oracle DBA
i2 technologies   www.i2.com

Balakrishnan Subramanian <c-bala.subramanian_at_wcom.com> Sent by: root_at_fatcity.com
06/22/01 10:10 AM
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        Subject:        OPS in Sun E10K

System : Sun E10K
OS : Sun solaris 2.8
Oracle : 8i Rel 3 64bit option
Database : OPS
Type : OLTP &
# concurrent users : 1000 (including US and international users Europe, Asia & Australia)

Our System admin suggesting us to go for File system (veritas, without Veritas quick i/o) instead of raw devices, the reason is ease of maintenance.  He says, with OS and Oracle tuning, we can bring OPS upto the level of raw device performance.

I appreciate if you can share your experience.

Thanks,

Bala.

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