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Re: Sizing - RAC, storage subsystem EMC

From: Waleed Khedr <wkhedr_at_attbi.com>
Date: Tue, 20 May 2003 05:01:46 -0800
Message-ID: <F001.0059DA32.20030520050146@fatcity.com>

  1. Do not use raid 5.
  2. Implement EMC hardware striping (RAID 0 + 1 ).
  3. Read about table compression in Oracle 9.2 if the data in the table will be static. You can easily cut the storage requirements by 70%.

Regards,

Waleed

  Hi all, hope you can give some input ideas.    

  I am in the process of designing a system for a client of ours for a proposal    

  The sizing information I have been given is as follows.    

  58.1 million tickets/day at 351 bytes per record. The record was complete populated (all columns filled to max) in a table and then analyzed. Average row size 351 bytes.

  =~ 19 GB/day. Raw data. Plus overhead (indexes, temp space, rollback, some other data etc) here and there I have requested 5 TB.    

  We need to keep records for a month. Table design I am looking at is a date partition with a second level hash partition. This is so that I can move data in the oldest week/table space off line and write them to optical storage for possible retrieval at a later date (requirement).    

  Of course this will be on locally managed table spaces with auto storage management for segments.    

  Hardware:

  The database will be a Oracle RAC 9.2.0.4 on Sun cluster 3 build on 2 x Sun StarFire V880, 4 CPU's, 4 GB RAM each,

  Connected to an EMC SAN via Fiber Channel    

  I do not have more information about the EMC array at the moment. Hitachi has been mentioned. (excuse the spelling)    

  Question I have.    

  I have been asked how many writes the Database will be doing to the SAN per second.

  I have determined that I should expect about 2000 tickets/second.

  The table in question will have 2 indexes.    

  Now following rough guessing I said I should expect at least 16 000 writes/second    

  This was done by say/assuming    

  2 writes for the redo log files (2 members)

  2 writes for the control files (2 control files)

  2 writes to index blocks

  1 write to undo table space block

  1 write to table block for data

  total 8 blocks written to per ticket.    

  Now I know the above is a real rough. And probably very wrong, if someone can shed some more light on it and give me a more accurate method/guess I would appreciate it.    

  Another question.

  The hardware SAN engineers are telling me they want to configure the SAN in a RAID 5 configuration. I have requested Raid 0 + 1. They say this is going to be to expensive and the new technology allows them to give me the performance I want using RAID 5.    

  I would prefer to err on the side of caution and follow Oracle industry wide recommendation and follow the SAME methodology.

  Comment.    

  Thx.    

  George


  George Leonard    

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  Once Informed & Totally Aware of the Risk, Every Fool Has the Right to Kill or Injure Themselves as They See Fit!    

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Author: Waleed Khedr
  INET: wkhedr_at_attbi.com

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