7 Replies Latest reply: Apr 25, 2012 11:35 AM by Saurabh Gupta-OC RSS

    1z0-515 High Performance disk space

    772262
      1z0-515 Question :-
      A Full Rack Oracle Exadata Database Machine can contain 100TB of disk space with high performance. How much user data should you conservatively estimate this configuration can hold?
      Answer is 100TB
      The other options are 75TB, 50TB, 28TB, 20TB
      I have worked on High performance exdata machine and it does not allow all the space to be used due to mirroring.
      Please can I know that on High performace can 100TB be used for full rack
      And what will be the case in High Capacity for full rack.
        • 1. Re: 1z0-515 High Performance disk space
          gsalem-Oracle
          Well,
          you said it in your email: HP disks, on a full rack, give 100TB or RAW disk space, if you use normal redundancy (you should have this at least), then divide this by 2, leading to 50TB, and if you subtract the space taken by the OS +.... and allow for rebalance in case you loose some disks, you get something around 45TB.

          With HC disks, you use the same math, but as the disks are now 5 times bigger than HP (3TB vs .6), you get around 45*5=225TB of usable disk space.
          • 2. Re: 1z0-515 High Performance disk space
            772262
            thanks for the reply.

            Please can I know what is the default disk space given on exadata full rack.
            • 3. Re: 1z0-515 High Performance disk space
              Uwehesse-Oracle
              You are not allowed to disclose Oracle University Exam questions.
              See here:
              http://www.oracle.com/partners/en/knowledge-zone/database/oracle-data-warehousing/dw-exam-168611.html#fap

              >
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              Please remove any discussion forum entries that contain Oracle University Exam questions.

              Kind regards
              Uwe Hesse

              http://uhesse.wordpress.com
              • 4. Re: 1z0-515 High Performance disk space
                772262
                Then from where do I get the clarification
                • 5. Re: 1z0-515 High Performance disk space
                  Uwehesse-Oracle
                  If you have any problem with OU Exams, there is a support link for that purpose available here:
                  http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=41&p_org_id=1001&lang=US&p_exam_id=1Z0_536#2

                  Kind regards
                  Uwe Hesse

                  http://uhesse.wordpress.com
                  • 6. Re: 1z0-515 High Performance disk space
                    Prosvet
                    Hi, read carefully Exadata spec. There are two configuration:
                    - Exadata Database Machine X2-8 Full Rack with High Performance SAS Disks
                    100 TB of raw disk data capacity
                    Up to 28 TB of uncompressed user data
                    - Exadata Database Machine X2-8 Full Rack with High Capacity SAS Disks
                    336 TB of raw disk data capacity
                    Up to 100 TB of uncompressed user data
                    ...
                    and you will have no questions about it ))))
                    • 7. Re: 1z0-515 High Performance disk space
                      Saurabh Gupta-OC
                      Below is the complete calculation:

                      In exadata full rack, the total number of storage servers=14
                      Each storage server contains 12 disks
                      Each disk contains 558 GB storage space (in case of SAS High Performance)
                      Hence the total raw storage size in full rack=14*12*558 GB=91 TB

                      Out of 91 TB the total usable storage size you would be getting around 28 TB after deducting the required storage for mirroring and REDO and SYSTEM data storage.

                      Even though I have answered your question, you should not ask certification questions on the forum and make it public.

                      Regards,
                      Saurabh

                      Edited by: 877938 on Apr 25, 2012 9:35 AM