EXADATA Base layout x5

Exadata is an appliance and  its combination of a Storage Server, Database Server, Cisco Switches with InfiniBand/RoCE switches hardware which built robust engineering machine which gives  us high-performing infrastructure with system fault tolerance.

[root@exax5c01 admin]# ./exa-raclayout.sh -s

                  X5-8 Quarter Rack HC 8TB

    U  |   Hostname  |    Host IP    |    ILOM name   |    ILOM IP    |
  ----------------------------------------------------------------------
   U22 | exax5sw-ib3 | 192.168.0.106 |                |               |
   U21 | exax5sw-ip  | 192.168.0.108 |                |               |
   U20 | exax5sw-ib2 | 192.168.0.104 |                |               |
   U17 | exax5d02    | 192.168.0.132 |  exax5d02-ilom | 192.168.0.142 |
   U16 | exax5d01    | 192.168.0.131 |  exax5d01-ilom | 192.168.0.141 |
   U7  |             |               |                |               |
   U6  | exax5c03    | 192.168.0.121 |  exax5c03-ilom | 192.168.0.93  |
   U5  |             |               |                |               |
   U4  | exax5c02    | 192.168.0.120 |  exax5c02-ilom | 192.168.0.92  |
   U3  |             |               |                |               |
   U2  | exax5c01    | 192.168.0.118 |  exax5c01-ilom | 192.168.0.91  |
   U0  | exax5-pdua  | 10.10.10.118  |
         exax5-pdub  | 10.10.10.120  |
  ----------------------------------------------------------------------
      Database Servers   Storage Servers   IB Switches   Cisco Switch

• Each Exadata storage cell node contains 12 physical disks.
• Each of the first two disks Exadata reserves for system area that spans 4 disks partitioned with total of 30GB approx.

• System area contains OS image, Exadata software binaries, metrics and various other config files and logs.
• The two system disks are mirror copies of each other maintained via software mirroring (mdadm) utility.
• LUN is the lowest level of storage abstraction visible to cell server.
• Cell disk is high level of abstraction for the data storage area on physical disk.
• Cell disk are configured based on LUN. The first two disks contain system area. The Exadata software recognizes the way LUN is partitioned and maps the cell disk to disk partition used for data storage.
• For other 10 disks Exadata maps the cell disks directly to the LUN.
• After cell disk is created it can be further sub divided in multiple grid disks which are directly exposed to oracle as ASM disk.